CN101867350B - Zero-intermediate-frequency/low-intermediate-frequency configurable variable gain amplifier - Google Patents
Zero-intermediate-frequency/low-intermediate-frequency configurable variable gain amplifier Download PDFInfo
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Abstract
The invention discloses a Zero-intermediate-frequency/low-intermediate-frequency (ZIF/LIF) configurable variable gain amplifier (VGA), which belongs to the technical field of radio-frequency communication. The Zero-intermediate-frequency/low-intermediate-frequency (ZIF/LIF) configurable variable gain amplifier (VGA) comprises a basic VGA circuit and a mode switching control circuit, wherein the mode switching control circuit mainly consists of two parts which are respectively positioned on a signal positive direction path and a feedback loop, and the two parts are mutually matched for realizing the configurable features of modules. The mode switching control circuit arranged on the signal positive direction path respectively adopts direct coupling and resistance-capacitance coupling modes to realize the zero-intermediate-frequency/low-intermediate-frequency work mode, and the mode switching control circuit arranged on the feedback switching control circuit is a direct-current imbalance eliminating switching control circuit used for controlling the work state of a direct-current imbalance eliminating circuit. The zero-intermediate-frequency/low-intermediate-frequency configurable variable gain amplifier of the invention can easily meet the requirements of miniaturization and high integration degree, and is particularly suitable for the system environment requiring multi-mode multi-band frequency and multi-standard work.
Description
Technical field
The invention belongs to the technology for radio frequency field, relate to a kind of variable gain amplifier, relate in particular to the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency, the pattern control switching circuit switches between zero intermediate frequency and the Low Medium Frequency pattern circuit working state, connect circuit at different levels by different coupled modes, thereby realize the multiplexing of hardware resource.
Background technology
At present, communication and RF application scientific and technological level improve constantly in the world, various System on Chip/SoCs with simple function develop day by day ripe, as use bluetooth (Bluetooth) to carry out the System on Chip/SoC of short range wireless transmission, use the broadband the Internet interconnection technique System on Chip/SoC of UMTS/WCDMA standard etc.Recent years, the fast development of technology has driven the leap of chip research and development technology level, can support the radio frequency chip research of the multiple mode of operation of a plurality of frequency ranges more and more to be subject to people's attention.This multimode frequency multiplexing technique makes the radio frequency chip can compatible different working frequency range and mode of operation, and no longer is a kind of single pattern.For example, merge the third generation portable terminal (3G) of global positioning system (GPS), had multi-mode function based on the covering main cities wireless network (WMAN/WiMAX) of IEEE802.16 standard and based on the PAN (Personal Area Network) System on Chip/SoCs such as (WPAN) of IEEE802.15 standard.In the 4th generation mobile terminal system of be about to releasing, not only have above function, can also use ultra broadband (UWB) standard to carry out short-distance wireless and connect transfer files etc.Because it is the demand that increases gradually of purposes and every field widely, make the multimode multifrequency become a kind of inexorable trend that communication and radio-frequency technique System on Chip/SoC develop.
Meanwhile, the develop rapidly of modernization communication and radio-frequency technique, in order to satisfy more and more higher demands such as low-power consumption, high integration, the change of chip structure is imperative, and the superhet structure of previous extensive use is replaced by zero intermediate frequency and Low Medium Frequency structure gradually.The composition of Modern wireless communication standard comprises the application of broadband and two aspects, arrowband, zero-if architecture is applicable in the system that requires broadband application, have frequency and select simple characteristic, almost can be applicable to the various systems except 802.15.4 standard and CDMA/WCDMA/AMPS/GPS.The Low Medium Frequency structure then can be used in the arrowband and play an important role, such as being applicable to application technologies such as bluetooth, GSM/DCS/PCS and 802.15.4.The radio frequency chip of prior art is realized the demand of multi mode multi band work, adopts zero intermediate frequency and Low Medium Frequency structure combining mode.The structure of the configurable variable gain amplifier module of using of zero intermediate frequency/Low Medium Frequency (ZIF/LIF) all is parallel organization at present, the variable gain amplifier module (ZIF VGA) of zero intermediate frequency mode of operation and variable gain amplifier module (LIF VGA) parallel organization of Low Medium Frequency mode of operation are made on the chip piece together, two signals of zero intermediate frequency and Low Medium Frequency are added to two variable gain amplifier module paths simultaneously, again separately by corresponding variable gain amplifier module, as shown in Figure 1.There are following several defectives in this parallel organization mode: there is the problem that interacts and interfere with each other in the signal path under the first, two different mode, and can have a strong impact on module so that the performance of entire chip.The second, the isolation of unlike signal path realizes by the circuit structure of complexity, not only improves the complexity of system, and will increase chip area, increases hardware resource expense and power consumption.The 3rd, when this parallel organization was worked when a kind of pattern, the entire portion of another kind of pattern all was to be in idle state, therefore can cause hardware resource and waste of electric energy.The 4th, module adopts parallel organization, chip area to increase at least to be twice, has not only increased cost but also has not satisfied the requirement of modern communications device miniaturization.The 5th, when the needs transformation working pattern, need start respectively two paths and close, and relate to the entire portion of two paths, can increase extra power consumption, make the power consumption of whole system increase.
Summary of the invention
The objective of the invention is the above-mentioned defective for the configurable variable gain amplifier parallel organization of zero intermediate frequency/Low Medium Frequency (ZIF/LIF) of the receiver radio frequency front end that solves prior art, propose a kind of configurable variable gain amplifier.This amplifier organically combines basic variable gain amplifier (VGA) and pattern control switching circuit, by pattern control switching circuit transformation working pattern, make it both can work in the zero intermediate frequency pattern, also can work in the Low Medium Frequency pattern, hardware costs such as chip area have not only been saved, also be convenient to be connected with front stage circuits, this configurability has increased the usable range of chip simultaneously, has improved the stability of whole receiver system.The configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the present invention (ZIF/LIF) is particularly suitable for mobile phone etc. and has the present mobile communication product of the multiple frequency range of various modes, and is convenient to be integrated in the system.
Above-mentioned purpose of the present invention is to realize by following technical scheme:
The configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it is that it comprises basic VGA circuit and zero intermediate frequency/Low Medium Frequency switch mode control circuit, and zero intermediate frequency/Low Medium Frequency pattern control switching circuit and VGA circuit connect by signal forward path and signal feedback loop; Wherein
Described zero intermediate frequency/Low Medium Frequency pattern control switching circuit is eliminated feedback model control switching circuit two parts by input pattern control switching circuit and DC maladjustment and is formed; The input pattern control switching circuit is positioned at the signal forward path, and the input pattern control switching circuit has two kinds of mode of operations corresponding to zero intermediate frequency and Low Medium Frequency: the signal forward path of zero intermediate frequency pattern is connected with the VGA circuit of back input signal by a switching circuit in direct-coupled mode; The signal forward path of Low Medium Frequency pattern is connected input signal with coupling circuit by bleeder circuit with the mode of VGA circuit with the combination coupling, the bleeder circuit of two resistance arranges suitable dc point, and electric capacity then is connected the mode of the VGA basic module of signal input part and back with resistance-capacitance coupling.
Described zero intermediate frequency/Low Medium Frequency pattern control switching circuit is eliminated feedback model control switching circuit two parts by input pattern control switching circuit and DC maladjustment and is formed; The input pattern control switching circuit is positioned at the signal forward path, and the input pattern control switching circuit has two kinds of mode of operations corresponding to zero intermediate frequency and Low Medium Frequency: the signal forward path of zero intermediate frequency pattern is connected with the VGA circuit of back input signal by a switching circuit in direct-coupled mode; The signal forward path of Low Medium Frequency pattern is connected input signal with coupling circuit by bleeder circuit with the mode of VGA circuit with the combination coupling, the bleeder circuit of two resistance arranges suitable dc point, and electric capacity then is connected the mode of the VGA basic module of signal input part and back with resistance-capacitance coupling;
DC maladjustment is eliminated switching feedback model control circuit and is comprised that DC maladjustment is eliminated circuit and zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit two parts; The DC maladjustment that is positioned on the signal feedback loop is eliminated the pattern control switching circuit, it also has two kinds of mode of operations corresponding to zero intermediate frequency and Low Medium Frequency, can work in corresponding pattern by the operating state that changes control signal control DC maladjustment elimination circuit: under the zero intermediate frequency pattern, zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit connection DC maladjustment elimination circuit makes it be in normal operating conditions, and DC maladjustment is eliminated circuit and suppressed the DC maladjustment composition; Under the Low Medium Frequency pattern, zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit makes DC maladjustment elimination circuit be in off state; Switching by zero intermediate frequency/Low Medium Frequency DC maladjustment elimination control circuit control signal realizes the switching of DC maladjustment elimination circuit working state.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it is that also described variable gain amplifier is basic VGA circuit, and it and zero intermediate frequency and Low Medium Frequency pattern control switching circuit are a module with compact syndeton framework;
The output of zero intermediate frequency and Low Medium Frequency pattern control switching circuit is connected VGA circuit input signal end, and provides corresponding coupling path for signal: the output of the control switching circuit under the control switching circuit under the zero intermediate frequency pattern and the Low Medium Frequency pattern is symmetry with respect to the VGA circuit input end and is connected; Control switching circuit output under the zero intermediate frequency pattern connects of two inputs of VGA circuit, and the output of the control switching circuit under the Low Medium Frequency pattern connects another of two inputs of VGA circuit.The pattern control switching circuit is positioned at before the basic VGA circuit, connects itself and input signal, and provides suitable path for signal.The circuit that is used for the zero intermediate frequency pattern closely is connected respectively with the circuit that is used for the Low Medium Frequency pattern, is distributed in the both sides of back module symmetry.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), its basic VGA element circuit that also is the configurable variable gain amplifier of described zero intermediate frequency/Low Medium Frequency is multiplex circuit, by the variable gain amplifier of the variable gain amplifier of zero intermediate frequency and Low Medium Frequency multiplexing; The configurable variable gain amplifier dual-mode structure of zero intermediate frequency/Low Medium Frequency is simple, chip occupying area compare with two monotype variable gain amplifier modules save near half.
Described input pattern control switching circuit is by resitstance voltage divider, two electronic switches and the four-terminal network that capacitor is formed of band current-limiting resistance; Resitstance voltage divider two ends connect power end and ground end respectively, and current-limiting resistance one end is connected two electric resistance partial pressure ends, and the other end connects an end of first electronic switch; Another electronic switch formation in parallel with electric capacity two-terminal network, the one end connects signal input part, and its other end connects the other end of first electronic switch and is tetrapolar output; The voltage ratio of resitstance voltage divider depends on the ratio of two divider resistances, and irrelevant with its absolute value, so can avoid the influence because of mismatch and temperature classes process deviation, effectively improves the systematic function of configurable variable gain amplifier.Configurable variable gain amplifier is simple in structure, and the element of increase and line are all less, and through optimal design, the area size is suitable with the variable gain amplifier that works in monotype only.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it is that also described VGA circuit eliminates circuit by several amplifying unit circuit and gain control circuit and DC maladjustment and form; Several amplifying unit circuit connect for the cascade structure form;
Described gain control circuit is a current/charge-voltage convertor, the variation of control voltage can be converted into the variation of corresponding electric current, it has many control output ends, each control output end is connected with corresponding several amplifying unit circuit control ends, and gain control circuit makes amplifying unit circuit gain linear change and improves yield value by the variation of control voltage;
Described DC maladjustment is eliminated circuit and mainly is made up of a backward difference amplifier and DC maladjustment composition detection elimination circuit, two electronic switches and two rc filter circuits constitute zero intermediate frequency/Low Medium Frequency DC maladjustment and eliminate control switching circuit, zero intermediate frequency/Low Medium Frequency pattern switching controls switching circuit can effectively be controlled the mode of operation that DC maladjustment is eliminated circuit, eliminate the DC maladjustment composition under the zero intermediate frequency pattern, improve the performance of circuit and system.
The big resistance resistance of two rc filter circuits adopts subthreshold value technology to realize that larger capacity electric capacity is realized that by metal-oxide-semiconductor electronic switch can be controlled by the outside.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it also is the VGA that described several amplifying unit circuits cascadings are a controllable gain, each amplifying unit circuit is the variable gain amplifier of fully differential structure, a plurality of amplifying units are the VGA of a controllable gain with difference input and difference output cascade, gain control circuit makes the gain of each grade amplifying unit and the gain of whole VGA circuit change with the control change in voltage by a plurality of control end output control voltages, the ac small signal of the undistorted amplification input of energy, and it is strong to have an antijamming capability, the big and good effect of the linearity of output voltage swing.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it is that also the VGA circuit that described several amplifying unit circuits cascadings are a controllable gain is configurable VGA circuit, gain control circuit is controlled by the gain that a plurality of each grade of control end output control voltage control amplifying units participate in whole VGA circuit, realizes the reasonable disposition of several amplifying unit circuits cascadings.Described control circuit can make the gain of each grade and entire circuit change with control voltage dB-linear, ac small signal that therefore can undistorted amplification input.
Basic VGA circuit is by several amplifying unit circuit, and gain control circuit and DC maladjustment are eliminated circuit and formed.In order to reach high gain, adopt the form of several amplifying unit cascades, the variation that control circuit can be controlled voltage changes its gain dB-linear, and DC maladjustment is eliminated circuit can eliminate the DC maladjustment composition, improves the performance of circuit and system.
The configurable variable gain amplifier of described a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF), it also is described DC maladjustment elimination circuit by the backward difference amplifier, the DC maladjustment composition detection is eliminated circuit and is constituted; DC maladjustment is eliminated the DC maladjustment composition that circuit can effectively be eliminated prime, and suppress the DC maladjustment composition that this module is introduced, and prevent from making useful signal saturated, and the performance of raising system.
Technical scheme of the present invention is that the variable gain amplifier of zero intermediate frequency variable gain amplifier and Low Medium Frequency is organically combined in a module by a pattern commutation circuit, realize a kind of configurable gain-changeable amplifier circuit of switching construction, it can be operated in two kinds of patterns, by the switching controls to two kinds of patterns, realize the switching of two kinds of mode of operations of zero intermediate frequency/Low Medium Frequency, multiplexing VGA circuit, thus the defective of prior art scheme solved.
Substantial effect of the present invention:
1, zero intermediate frequency variable gain amplifier and Low Medium Frequency variable gain amplifier two modules an are united two into one module, there is the problem that interacts and interfere with each other in the signal path of having eliminated under two different modes, and has improved the performance of entire chip.
2, save the complicated circuit construction that signal path is isolated, reduced preventing that parallel organization from interfering with each other measure and the system complexity that increases has been saved chip area and corresponding hardware cost and power consumption simultaneously.
3, two kinds of mode multiplexing VGA circuit hardware resources of the present invention are avoided unnecessary energy consumption and the decay of two signal paths and are introduced extra noise, have improved systematic function.
4, the configurable variable gain amplifier module of the zero intermediate frequency/Low Medium Frequency of a plurality of amplifying circuit fully differential cascade constitutes compactly, and chip area reduces nearly one times, and the communication device miniaturization requirement that is content with very little is suitable for the portable communication device in various modern times.
5, the DC maladjustment of single module is eliminated circuit and can effectively be eliminated the DC maladjustment composition that the prime module is introduced under the zero intermediate frequency mode of operation, suppresses the DC maladjustment composition of this module simultaneously.
6, configurable variable gain amplifier can be operated under zero intermediate frequency and the Low Medium Frequency pattern, can make that according to system and external environment condition adjusting the purposes of chip is more extensive flexibly.
Description of drawings:
Fig. 1 for prior art adopt zero intermediate frequency/Low Medium Frequency variable gain amplifier the formation block diagram of wireless receiver of parallel organization configuration.
Wherein: LNA is low noise amplifier, and LPF is low pass filter, and BPF is band pass filter, and ZIFVGA is the zero intermediate frequency variable gain amplifier, and LIF VGA is the Low Medium Frequency variable gain amplifier, and ADC is digital to analog converter, and DSP is digital signal processing chip.
Fig. 2 is the block diagram of a unit of formation of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention.
Among Fig. 2: the configurable variable gain amplifier of 21-unit, 211-Low Medium Frequency pattern control switching circuit, 212-zero intermediate frequency pattern control switching circuit, the VGA amplifying unit circuit that 213-is basic, 201,202-input signal end, 22-power end, 231, the 232-VGA output signal end.
Fig. 3 is the input pattern control switching circuit block diagram of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention;
Among Fig. 3: 22-power supply, 31-input pattern control switching circuit, 311,3 12-divider resistances, 313-protective resistance, 314,316-electric capacity, 30-signal input part, 32-signal ground, 33-output.
Fig. 4 is the schematic diagram that the zero intermediate frequency/Low Medium Frequency DC maladjustment of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention is eliminated control circuit.
Among Fig. 4: the backward difference amplifier on the 461-feedback control loop, 462, the big resistance resistance of 463-, 464,465-larger capacity electric capacity, 466, the 467-signal ground, 471,472-zero intermediate frequency/Low Medium Frequency pattern switching controls switching circuit.
Fig. 5 is that the zero intermediate frequency mode circuit of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention constitutes block diagram;
Among Fig. 5: 51-zero intermediate frequency pattern VGA, the 52-gain control circuit, the 53-DC maladjustment is eliminated circuit, and 511,512, the variable gain amplifier element circuit under the 513-zero intermediate frequency pattern.
Fig. 6 is that the Low Medium Frequency mode circuit of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention constitutes block diagram;
Among Fig. 6: the Low Medium Frequency mode circuit of the configurable variable gain amplifier of 61-; 6111,6121, the variable gain amplifier element circuit of 6131-Low Medium Frequency pattern; 6112,6122,6132-coupling capacitance; 6113; 6123; the 6133-protective resistance, Vbias-bias voltage, 62-gain control circuit.
Fig. 7 is the entire block diagram of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the embodiment of the invention.
Among Fig. 7: 71,72, the configurable variable gain amplifier element circuit of 73-ZIF/LIF, the 74-gain control circuit, the 75-ZIF/LIF DC maladjustment is eliminated control circuit, and the 76-DC maladjustment is eliminated circuit.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Fig. 2 is the formation block diagram that adopts the configurable variable gain amplifier unit module of zero intermediate frequency/Low Medium Frequency of the present invention (ZIF/LIF).A variable gain amplifier unit is made of Low Medium Frequency pattern control switching circuit 211, zero intermediate frequency pattern control switching circuit 212 and basic VGA circuit 213., 22 is power end, and 201,202,231,232 are respectively signal differential input and difference output end.211,212 control switching circuits that are respectively Low Medium Frequency and zero intermediate frequency, 213 is basic VGA amplifying unit circuit.211,212 lay respectively on Low Medium Frequency and the zero intermediate frequency signals path, the two walks abreast and connects differential input signal, and links to each other with the basic VGA amplifying unit circuit of back.Differential input signal 201,202 and 211,212 is connected respectively, amplifies through 213 afterwards, becomes differential output signal 231,232.When gain-changeable amplifier circuit works in the Low Medium Frequency pattern, under Low Medium Frequency pattern control switching circuit 211 and the 212 combination controls of zero intermediate frequency pattern control switching circuit, allow signal enter the VGA amplifier circuit by the Low Medium Frequency control switching circuit, and not by zero intermediate frequency pattern commutation circuit, realize the Low Medium Frequency mode of operation of this unit module.In like manner, realize the zero intermediate frequency mode of operation of this unit module.The commutation circuit of two kinds of patterns is relatively independent, guaranteed that two kinds of mode of operations can phase mutual interference and influence, and two kinds of identical parts of pattern is that basic VGA circuit is both multiplex circuits, have saved hardware resource.Modular circuit is simple simultaneously, and control is convenient, and is of many uses.Be conducive to the radio frequency front end chip of receiver is separated with baseband processing chip, and adopt two kinds of pattern commutation circuits and basic VGA circuit to combine, effective and be attainable to overcoming traditional technical disadvantages.
Fig. 3 provides the schematic diagram of the input pattern control switching circuit of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the present invention (ZIF/LIF).Low Medium Frequency pattern commutation circuit is by voltage divider resistance 311 and 312, protective resistance 313, electronic switch 314,317 and electric capacity 316 form.When circuit need be worked under the Low Medium Frequency pattern, outside control signal control electronic switch 314 closures that produce, 317 disconnect, the Low Medium Frequency signal that this moment, front frequency mixer down-conversion obtained enters the basic VGA circuit of back by electric capacity 316, and the output voltage of electric resistance partial pressure is the suitable direct current biasing working point of Low Medium Frequency pattern configurations through current-limiting resistance.When circuit conversion is worked to the zero intermediate frequency pattern, switch 317 closures of this control switching circuit, 314 disconnect, and then signal directly enters the VGA circuit and finishes the gain amplification.Can realize the configurable of circuit to the control action of pattern control switching circuit by control signal thus.
Fig. 4 provides the schematic diagram of zero intermediate frequency/Low Medium Frequency DC maladjustment elimination feedback model control switching circuit of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the present invention (ZIF/LIF), and this is the feedback model control circuit.When circuit working during in the zero intermediate frequency pattern, this feedback model control switching circuit makes the switch 471,472 of two paths all closed, forms feedback network, and this moment, DC maladjustment was eliminated the circuit operate as normal, eliminated the DC maladjustment composition in the circuit; When circuit working during in the Low Medium Frequency pattern, this control circuit all disconnects two switches in the differential signal feedback network, and then feedback network is cut off, and namely DC maladjustment is eliminated circuit and is in shutdown mode.Input pattern control switching circuit among this control circuit and Fig. 4 is worked in coordination, and realizes the configurable of whole gain-changeable amplifier circuit.Big resistance resistance 462 and 463 adopts subthreshold value technology to realize, larger capacity electric capacity 464 and 465, and available metal-oxide-semiconductor is realized.
The zero intermediate frequency operating mode circuit that Fig. 5 provides the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF) of the embodiment of the invention constitutes block diagram.Referring to Fig. 5, the zero intermediate frequency operating mode circuit 51 of configurable variable gain amplifier is by the direct-coupled variable gain amplifier 511 of cascade, 512,513, gain control circuit 52 and DC maladjustment are eliminated circuit 53 and are constituted, the output signal of upper level variable gain amplifier directly enters the next stage circuit as the input signal of next stage variable gain amplifier, gain control circuit 52 outputs are received variable gain amplifier 511 respectively, 512,513 control end, the output signal of afterbody variable gain amplifier 513 is eliminated the input that circuit 53 feeds back to first order variable gain amplifier through DC maladjustment.In order to eliminate the DC maladjustment composition that prime is brought, need configuring direct current under the zero intermediate frequency pattern.At this moment, the control of eliminating control circuit by zero intermediate frequency/Low Medium Frequency DC maladjustment makes DC maladjustment eliminate the circuit operate as normal, but namely the circuit operate as normal in the zero intermediate frequency pattern.
The circuit that Fig. 6 provides the Low Medium Frequency mode of operation of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency of the present invention (ZIF/LIF) constitutes block diagram.It by three grades of VGA6111 of cascade, 6121,6131 and gain control circuit 62 form.Each grade arranges suitable working point with the form of electric resistance partial pressure, and the connected mode of resistance-capacitance coupling is adopted in cascade.Because the Low Medium Frequency structure does not need DC maladjustment to eliminate circuit, so pass through the effect of zero intermediate frequency/Low Medium Frequency DC maladjustment control switching circuit, make DC maladjustment eliminate circuit and do not work, this moment, circuit namely was operated under the Low Medium Frequency pattern.
Fig. 7 provides the overall structure block diagram of the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency (ZIF/LIF) of the embodiment of the invention.The overall structure that goes out as shown in the figure is by the configurable variable gain amplifier modular unit 71 of the ZIF/LIF of the form structure of three grades of circuits cascadings, 72,73, gain control circuit 74, zero intermediate frequency/Low Medium Frequency DC maladjustment eliminate control circuit 75 and DC maladjustment is eliminated circuit 76 compositions.The control circuit that the configurable variable gain amplifier modular unit of each grade ZIF/LIF has the ZIF/LIF pattern to switch, being used for controlling mode of operation is zero intermediate frequency or Low Medium Frequency.The control circuit of whole module can control circuit gain.Zero intermediate frequency/Low Medium Frequency DC maladjustment control circuit can be controlled the operating state that DC maladjustment is eliminated circuit, cooperates the effect of the model selection control circuit of each grade simultaneously, thus make circuit can operate as normal under the pattern of needs.The configurable variable gain amplifier of zero intermediate frequency/Low Medium Frequency that several are shown in Figure 2 (ZIF/LIF) unit couples together, make the gain size of each grade of gain control circuit controls, and signal output part is eliminated circuit by DC maladjustment be connected with signal input part with the feedback control loop that zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated the control circuit formation, constituted the configurable variable gain amplifier of zero intermediate frequency/Low Medium Frequency of the present invention jointly.The output signal of prime is at first selected by the pattern control switching circuit of the first order, amplifies then, exports by afterbody at last.And the DC maladjustment of output elimination circuit is worked under the zero intermediate frequency pattern, and the DC maladjustment composition of output signal can be fed back to input subtracts each other, and eliminates the DC maladjustment composition, improves circuit and systematic function.
The above embodiments only are that exemplary type is described, and do not constitute limitation of the invention.Present technique goes for the equipment of other type.Specification of the present invention only is illustrative description, and it does not limit the scope of the claims.Though for those skilled in the art of the present technique various replacements, improvement and variation can be arranged, the description that device adds function in claims is intended to contain the structure that realizes described function, and it is equal that it is not only structure, also comprises equal structure.
Claims (7)
1. configurable variable gain amplifier of zero intermediate frequency/Low Medium Frequency, it is characterized in that: it comprises VGA circuit and zero intermediate frequency/Low Medium Frequency pattern control switching circuit, and zero intermediate frequency/Low Medium Frequency pattern control switching circuit and VGA circuit connect by signal forward path and signal feedback loop;
Described VGA circuit is multiplex circuit, by the variable gain amplifier of the variable gain amplifier of zero intermediate frequency and Low Medium Frequency multiplexing; The configurable variable gain amplifier dual-mode structure of zero intermediate frequency/Low Medium Frequency is simple, chip occupying area compare with two monotype variable gain amplifier modules save near half;
Described zero intermediate frequency/Low Medium Frequency pattern control switching circuit comprises the circuit of zero intermediate frequency pattern switching controls and Low Medium Frequency pattern switching controls, control VGA circuit working pattern is switched between two patterns of zero intermediate frequency/Low Medium Frequency, makes controlled zero intermediate frequency pattern or the Low Medium Frequency pattern of working in of VGA circuit;
Described zero intermediate frequency/Low Medium Frequency pattern control switching circuit is eliminated feedback model control switching circuit two parts by input pattern control switching circuit and DC maladjustment and is formed; The input pattern control switching circuit is positioned at the signal forward path, and the input pattern control switching circuit has two kinds of mode of operations corresponding to zero intermediate frequency and Low Medium Frequency: the signal forward path of zero intermediate frequency pattern is connected with the VGA circuit of back input signal by a switching circuit in direct-coupled mode; The signal forward path of Low Medium Frequency pattern is connected input signal with coupling circuit by bleeder circuit with the mode of VGA circuit with the combination coupling, the bleeder circuit of two resistance arranges suitable dc point, and electric capacity then is connected the mode of the VGA circuit of signal input part and back with resistance-capacitance coupling;
DC maladjustment is eliminated the feedback model control switching circuit and is comprised that DC maladjustment is eliminated circuit and zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit two parts; The DC maladjustment that is positioned on the signal feedback loop is eliminated the feedback model control switching circuit, it also has two kinds of mode of operations corresponding to zero intermediate frequency and Low Medium Frequency, can work in corresponding pattern by the operating state that changes control signal control DC maladjustment elimination circuit: under the zero intermediate frequency pattern, zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit connection DC maladjustment elimination circuit makes it be in normal operating conditions, and DC maladjustment is eliminated circuit and suppressed the DC maladjustment composition; Under the Low Medium Frequency pattern, zero intermediate frequency/Low Medium Frequency DC maladjustment is eliminated control circuit makes DC maladjustment elimination circuit be in off state; Switching by zero intermediate frequency/Low Medium Frequency DC maladjustment elimination control circuit control signal realizes the switching of DC maladjustment elimination circuit working state.
2. the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency according to claim 1, it is characterized in that: described variable gain amplifier is basic VGA circuit, and it and zero intermediate frequency/Low Medium Frequency pattern control switching circuit are a module with compact syndeton framework;
The output of zero intermediate frequency/Low Medium Frequency pattern control switching circuit connects VGA circuit input signal end, and provides corresponding coupling path for signal: the output of the control switching circuit under the control switching circuit under the zero intermediate frequency pattern and the Low Medium Frequency pattern is symmetrical with respect to the VGA circuit input end and is connected; Control switching circuit output under the zero intermediate frequency pattern connects of two inputs of VGA circuit, and the output of the control switching circuit under the Low Medium Frequency pattern connects another of two inputs of VGA circuit.
3. the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency according to claim 1 is characterized in that: described input pattern control switching circuit is by resitstance voltage divider, two electronic switches and the four-terminal network that capacitor is formed of band current-limiting resistance; Resitstance voltage divider two ends connect power end and ground end respectively, and current-limiting resistance one end is connected two electric resistance partial pressure ends, and the other end connects an end of first electronic switch; Another electronic switch formation in parallel with capacitor two-terminal network, the one end connects signal input part, and its other end connects the other end of first electronic switch and is tetrapolar output; The voltage ratio of resitstance voltage divider depends on the ratio of two resistance, and irrelevant with its absolute value, so can avoid the influence because of mismatch and temperature classes process deviation, effectively improves the systematic function of configurable variable gain amplifier.
4. the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency according to claim 1 is characterized in that: described VGA circuit is eliminated circuit by several amplifying unit circuit and gain control circuit and DC maladjustment and is formed; Several amplifying unit circuit connect for the cascade structure form;
Described gain control circuit is a current/charge-voltage convertor, the variation of control voltage can be converted into the variation of corresponding electric current, it has many control output ends, each control output end is connected with corresponding several amplifying unit circuit control ends, and gain control circuit makes amplifying unit circuit gain linear change and improves yield value by the variation of control voltage;
Described DC maladjustment is eliminated circuit and mainly is made up of a backward difference amplifier and DC maladjustment composition detection elimination circuit, two electronic switches and two rc filter circuits constitute zero intermediate frequency/Low Medium Frequency DC maladjustment and eliminate control switching circuit, zero intermediate frequency/Low Medium Frequency pattern switching controls switching circuit can effectively be controlled the mode of operation that DC maladjustment is eliminated circuit, eliminate the DC maladjustment composition under the zero intermediate frequency pattern, improve the performance of circuit and system;
The big resistance resistance of two rc filter circuits adopts subthreshold value technology to realize that larger capacity electric capacity is realized that by metal-oxide-semiconductor electronic switch can be controlled by the outside.
5. the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency according to claim 4, it is characterized in that: the VGA that described several amplifying unit circuits cascadings are a controllable gain, each amplifying unit circuit is the variable gain amplifier of fully differential structure, a plurality of amplifying units are the VGA of a controllable gain with difference input and difference output cascade, gain control circuit makes the gain of each grade amplifying unit and the gain of whole VGA circuit change with the control change in voltage by a plurality of control end output control voltages, the ac small signal of the undistorted amplification input of energy, and it is strong to have an antijamming capability, the big and good effect of the linearity of output voltage swing.
6. the configurable variable gain amplifier of a kind of zero intermediate frequency/Low Medium Frequency according to claim 4, it is characterized in that: the VGA circuit that described several amplifying unit circuits cascadings are a controllable gain is configurable VGA circuit, gain control circuit is controlled by the gain that a plurality of each grade of control end output control voltage control amplifying units participate in whole VGA circuit, realizes the reasonable disposition of several amplifying unit circuits cascadings.
7. according to claim 1 or the configurable variable gain amplifier of 4 described a kind of zero intermediate frequency/Low Medium Frequencies, it is characterized in that: described DC maladjustment is eliminated circuit by the backward difference amplifier, and the DC maladjustment composition detection is eliminated circuit and constituted; DC maladjustment is eliminated the DC maladjustment composition that circuit can effectively be eliminated prime, and suppress the DC maladjustment composition that this module is introduced, and prevent from making useful signal saturated, and the performance of raising system.
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| CN102523061B (en) * | 2011-12-30 | 2018-06-15 | 江苏苏美达机电有限公司 | The control device of two-way radio-frequency signal |
| CN104393845B (en) * | 2014-10-21 | 2018-03-13 | 东南大学 | A kind of current-mode variable gain amplifier |
| CN105932420A (en) * | 2016-05-31 | 2016-09-07 | 芜湖辉灿电子科技有限公司 | Mobile phone antenna with multiple alternatively used branches |
| CN106559052A (en) * | 2016-11-22 | 2017-04-05 | 西京学院 | A kind of electro-nic message transmissions amplifier |
| JP6946037B2 (en) * | 2017-04-05 | 2021-10-06 | ルネサスエレクトロニクス株式会社 | Wireless receiver |
| CN109905089B (en) * | 2019-01-25 | 2020-06-26 | 北京大学 | High-speed composite loop controller and control method thereof |
| CN113938212B (en) * | 2021-11-24 | 2023-03-28 | 华中科技大学 | Direct current offset eliminating circuit with switchable bandwidth |
| CN114866041A (en) * | 2022-04-28 | 2022-08-05 | 西安交通大学 | DC offset cancellation circuit and method |
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