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WO2016164005A1 - Architecture à faible bruit - Google Patents

Architecture à faible bruit Download PDF

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Publication number
WO2016164005A1
WO2016164005A1 PCT/US2015/024839 US2015024839W WO2016164005A1 WO 2016164005 A1 WO2016164005 A1 WO 2016164005A1 US 2015024839 W US2015024839 W US 2015024839W WO 2016164005 A1 WO2016164005 A1 WO 2016164005A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency bands
intermediate frequency
signals
frequency
nyquist zone
Prior art date
Application number
PCT/US2015/024839
Other languages
English (en)
Inventor
Martin Alderton
Original Assignee
Entropic Communications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Entropic Communications, Inc. filed Critical Entropic Communications, Inc.
Priority to PCT/US2015/024839 priority Critical patent/WO2016164005A1/fr
Publication of WO2016164005A1 publication Critical patent/WO2016164005A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
    • H04B1/0025—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage using a sampling rate lower than twice the highest frequency component of the sampled signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes

Definitions

  • the disclosed technology relates generally to satellite communications, and more particularly, some embodiments relate to improved LNB Architectures.
  • FIG. 1 is a diagram illustrating a typically outdoor unit.
  • a satellite receiver outdoor unit (ODU) 110 typically comprises a dish antenna 150, one or more antenna feed horns 130, one or more low noise amplifier and block down converters (LNB) 140, and an optional multiport cross point switch 160.
  • Dish 150 collects and focuses received signal power onto antenna feed horns 130 which couples the signal to LNBs 140.
  • a single dish 150 may have multiple feed horns 130 wherein each feed receives a signal from a different satellite in orbit.
  • An installation may have more than one dish, feed, and LNB assemblies.
  • the cross point switch 160 allows connection of the outdoor unit 110 to more than one integrated receiver decoder (IRD) 180 located inside the building.
  • IRDs are commonly called set top boxes (STBs) arising from their typical installed location on top of TV sets.
  • the LNB 140 converts the signal transmitted by a satellite in Earth orbit, for example C band, Ku band, or another frequency band, to a lower intermediate frequency (IF) suitable for transmission through coax inside a building.
  • IF intermediate frequency
  • L band IF 950 to 1450 MHZ
  • the IRD 180 tunes one transponder channel, demodulates the IF signal from the LNB down to base band, provides channel selection, conditional access, decodes the digital data to produce a video signal, and generates an output to drive a television.
  • a satellite outdoor unit may have as many as three or more LNBs each with one or two receiving polarizations.
  • the received polarization is selected by sending a voltage or other control signal to the LNB.
  • six or more possible 500 MHz signals may be selected by the multiport cross point switch to be routed to each IRD.
  • the 500 MHz signal is typically comprised of 16 transponder signals of 24 MHz bandwidth each with a guard band in between each transponder signal. Other transponder bandwidths may be used, such as 36 MHz or 54 MHz (either a single channel or shared by two TV signals) and 43 MHz.
  • FIG. 2 is a diagram illustrating an example implementation of a low noise block 140.
  • the low noise block LNB receives horizontally and vertically polarized signals (or right and left circular polarized signals) from the satellite.
  • low noise block includes one or more low noise amplifiers (LNA) 141 to amplify the received signal to an acceptable level for processing.
  • the amplification may be done as close to the signal source (e.g., the antenna) as possible to avoid amplifying additionally introduce noise.
  • the amplified received signal can be passed through a bandpass filter 142 to filter out unwanted noise from the signal.
  • a down converter 143 can be used to downconvert the received signal to an intermediate frequency or directly to a desired frequency for distribution.
  • the down converter includes a mixer and a local oscillator at a frequency (e.g., 9.75 GHz or 10.6 GHz) chosen to give a 950-2150MHz intermediate frequency.
  • the downconverted signal can be further filtered and amplified prior to distribution. This is illustrated by low pass filter (LPF) 144 and amplifier (AMP) 146.
  • Switches 147 can be provided to allow selection and placement of the desired signal onto a selected output. Additional amplifiers 148 can also be provided for distribution of the signals such as, for example, along the cable drop.
  • a switch control module 149 can also be provided to control selection of the matrix which is 147. Switch control, for example, can respond to commands from the set top boxes to ensure delivery of desired program content accordingly.
  • FIG. 3 is a diagram illustrating another example of a low noise block (LNB) 140.
  • the example illustrated in FIG. 3 in particular is an example of a wideband LNB. Similar to the example illustrated in FIG. 2, this LNB 140 includes low noise amplifiers 141, and pass filters 142, downconverters 143, and low pass filters 144.
  • the output for each polarization (horizontal and vertical, or Right-Hand and Left-Hand Circular) is on a single output, which in this instance covers 290-2340 MHz, or approximately 2 GHz in bandwidth.
  • LNB downconverter designs for some applications such as, for example, fixed satellite communications services, or FSS and DBS applications typically employ the LNB in conjunction with a high-speed sampling analog-to-digital converter (ADC).
  • ADC analog-to-digital converter
  • Nyquist zone n refers to the frequency range from (n-l)Fs/2 to nFs/2. That is, Nyquist zonel is DC to Fs/2, Nyquist zone 2 is Fs/2 to Fs, and so on.
  • a low noise block can be configured to include an input lead configured to receive a satellite signal comprising a plurality of RF signals at predetermined frequency bands.
  • a downconverter which includes an oscillator and a mixer, downconverts the predetermined frequency bands to intermediate frequency bands.
  • An analog-to-digital converter operating at a sampling frequency digitizes the signals in the IF frequency bands.
  • a frequency of the signal provided to the mixer to downconvert the RF signals is selected such that upon conversion to digital symbols by the analog-to-digital converter, aliasing due to the conversion does not cause the one of the intermediate frequency bands above Nyquist zone 1 to fold onto the other intermediate frequency bands.
  • a combiner may be included and coupled (whether directly or indirectly) between the mixer and the analog-to-digital converter.
  • a low noise amplifier may also be included and coupled (whether directly or indirectly) between the input lead and the input to the downconverter.
  • bandpass filters are not needed to avoid folding the one of the intermediate frequency bands above Nyquist zone 1 onto the other intermediate frequency bands. Although bandpass filters are not needed to avoid this unwanted folding, bandpass filters or some other noise filtering may be still be included to filter out or reduce unwanted noise.
  • the frequency of the sampling signal in various embodiments may be selected in conjunction with selecting the frequency of the signal provided to the mixer for downconversion.
  • a method for establishing LNB parameters to avoid folding intermediate frequency bands above Nyquist zone 1 onto the other intermediate frequency bands can be implemented to include determining a plurality of frequency bands at which the LNB will operate; determining a sampling rate of an analog-to-digital converter in the LNB; and selecting a mixer input frequency for downconverting the plurality of frequency bands to intermediate frequency bands, wherein the mixer input frequency selected such that upon conversion to digital symbols by the analog-to-digital converter, aliasing due to the conversion does not cause the one of the intermediate frequency bands above Nyquist zone 1 to fold onto the other intermediate frequency bands.
  • bandpass filters are not needed to avoid folding the one of the intermediate frequency bands above Nyquist zone 1 onto the other intermediate frequency bands.
  • a method for down converting and digitizing satellite signals in a plurality of RF frequency bands includes mixing the satellite signals in the plurality of RF frequency bands with a frequency signal to downconvert the satellite signals in the plurality of RF frequency bands to signals in a plurality of IF frequency bands; and in an analog-to-digital converter, converting the signals in the plurality of signals in the IF frequency bands to digital signals; wherein a frequency of the frequency signal used to downconvert is selected such that upon conversion to digital symbols by the analog-to-digital converter, aliasing due to the conversion does not cause the one of the intermediate frequency bands above Nyquist zone 1 to fold onto the other intermediate frequency bands.
  • Embodiments of the technology disclosed herein may include selecting the frequency of a sampling signal in conjunction with selecting the frequency of the signal provided to the mixer to avoid folding the one of the intermediate frequency bands above Nyquist zone 1 onto the other intermediate frequency bands.
  • bandpass filters are not needed to avoid this unwanted folding, bandpass filters or some other noise filtering may be still be included to filter out or reduce unwanted noise.
  • FIG. 1 is a diagram illustrating a typically outdoor unit.
  • FIG. 2 is a diagram illustrating an example implementation of a low noise block.
  • FIG. 3 is a diagram illustrating another example of a low noise block
  • FIG. 4 is a diagram illustrating an example of three sets of satellite signals in three frequency bands.
  • FIG. 5 is a diagram illustrating an example of downconversion and analog- to-digital conversion.
  • FIG. 6 is a diagram illustrating the output spectrum of the analog-to- digital converter in the example of FIG. 5.
  • FIG. 7 is a diagram illustrating an example of three sets of satellite signals in three frequency bands.
  • Figure 8 is a diagram illustrating an example of downconversion and analog-to-digital conversion with LNB parameters of sampling rate and oscillator frequency selected to avoid folding of signals above Nyquist zone 1 onto other signals.
  • FIG. 9 is a diagram illustrating an output spectrum of the analog-to-digital converter in accordance with the example of FIG. 8.
  • FIG. 10 is a diagram illustrating an example process for selecting LNB parameters of sampling rate and oscillator frequency in order to avoid folding of signals above Nyquist zone 1 onto other signals.
  • FIG. 11 is a diagram illustrating an example computing module which can be used in accordance with various embodiments of the technology described herein.
  • Embodiments of the technology disclosed herein are directed toward a devices and methods for providing techniques for improving satellite communications.
  • LN B configurations can be implemented to eliminate the need for anti-aliasing filters that would otherwise be used to eliminate or relax the effects of aliasing resulting from sampling at an ADC below the Nyquist frequency.
  • embodiments can be implemented in which the oscillator frequency used for downconversion is chosen to provide a gap in the IF frequency spectrum at a place or places in that spectrum into which one or more signals from Nyquist zones above Nyquist zone 1 will fold after analog-to-digital conversion.
  • Aliasing occurs when the system is unable to sample a signal at at least the Nyquist sampling frequency.
  • the Nyquist sampling frequency is two times the frequency of the sampled signal. That is, an ADC can adequately measure the frequency of a signal with frequency / as long as the sampling rate is 2/ or more. If a signal being sampled has a frequency above / with a sampler operating at 2/ an alias of the signal is created at frequencies below/.
  • the alias can be defined by
  • alias appears as a mirror image of the original frequency on the other side of the Nyquist frequency. This is referred to as aliasing or folding. Such aliasing can be problematic where the aliases may overlap with, and hence interfere with, signals from other frequency bands.
  • FIG. 5 illustrates an example downconversion of these three sets 201, 202, 203, or bands, to IF using two downconverters.
  • the LNB includes an input lead configured to receive the satellite signals coupled to a pair of downconverters, which include oscillators 211 (e.g., dielectric resonant oscillators, or DROs, although other oscillators can be used) and mixers 212 to downconvert the received signals to IF.
  • oscillators 211 e.g., dielectric resonant oscillators, or DROs, although other oscillators can be used
  • mixers 212 to downconvert the received signals to IF.
  • the oscillators 211 are at frequencies of 16.2 GHz and 20.6 GHz to mix these bands down to the IF range of 0.4 GHz - 2.3 GHz for capture by an ADC 214 with a sample rate (Fs) of 5.4 GHz.
  • the IF signals are then digitized by ADC 214 to generate digital symbols representing the analog IF signals.
  • a sample clock can be included to provide the sampling signal at the designated sample rate Fs. With a sample rate of 5.4 GHz, Nyquist zone 1 is DC to 2.7 GHz and Nyquist Zone 2 is from 2.7 GHz to
  • the 17.3 GHz - 17.7 GHz band 201 is mixed down to 1.1 GHz -
  • the 18.3 GHz -18.8 GHz band 202 is mixed down to 1.8 GHz - 2.3 GHz 222 by the 20.6 GHz oscillator 211
  • the 19.7 GHz - 20.2 GHz band 203 is mixed down to 0.4 GHz - 0.9 GHz 223 by the 20.6 GHz oscillator 211.
  • mixer 212 with 16.2 GHz oscillator 211 also translates RF energy from the 18.3 GHz - 18.8 GHz band 202 and the 19.7 GHz - 20.2 GHz band 203 down to 2.1 GHz - 2.6 GHz 232 and 3.5 GHz - 4.0 GHz 233, respectively. These are also shown in FIG. 5.
  • the mixer with 20.6 GHz oscillator 211 translates RF energy from the 17.3 GHz - 17.7 GHz band 201 down to 2.9 GHz - 3.3 GHz 231 as also shown in FIG. 5.
  • the energy at 2.9 GHz - 3.3 GHz in Nyquist zone 2 will fold on top of the 2.1 GHz - 2.5 GHz energy from Nyquist zone 1, (as seen at 251 in FIG. 6), unless it is filtered out at the LNB.
  • a low pass filter is required as shown in FIG. 5 (line 215) (or at FIG. 4) to filter out this signal before ADC 214.
  • a low pass filter (line 217) is included to filter out the Nyquist zone 1 energy at 2.1 GHz - 2.6 GHz 232, because it falls at the same frequency as the energy at 1.8 GHz - 2.3 GHz 222.
  • the LNB includes a downconverter, which an oscillator 341 and a mixer 342. This is shown in the example of FIG. 8.
  • oscillator 341 frequency 16.9 GHz
  • the 17.3 GHz - 17.7 GHz band 201 is mixed down to 0.4 GHz - 0.8 GHz 301
  • the 18.3 GHz - 18.8 GHz band is mixed down to 1.4 GHz - 1.9 GHz 302
  • the 19.7 GHz - 20.2GHz band is mixed down to 2.8 GHz - 3.3 GHz 303.
  • the oscillator frequency provided to the input of mixer 342 can be an oscillator signal generated by the oscillator, and can include a frequency generated using frequency multipliers or dividers.
  • the IF signals are digitized by ADC 344 to generate digital symbols representing the analog IF signals.
  • ADC 344 can be included to provide the sampling signal at the designated sample rate Fs.
  • the resultant signals after combining by combiner 343 and analog-to- digital conversion by ADC 344 are shown in FIG. 9 for this example.
  • the first two bands are at 0.4 GHz - 0.8 GHz 321, and 1.4 GHz - 1.9 GHz 322, as they fall in Nyquist zone 1.
  • the IF energy at 2.8 GHz - 3.3 GHz 303 in Nyquist zone 2 folds down to 2.1 GHz - 2.6 GHz 333, which does not fold on top of either of the energy bands in Nyquist zone 1. Because there is no overlap, antialias filters that would otherwise be used to address the overlap can be avoided in the LNB, and energy separation can be achieved entirely in the DSP. Noise suppression filters, illustrated by lines 345, however, may still be included. [0044] In addition, as this example illustrates, in various embodiments the number of oscillators and mixers is roughly halved, also contributing to a reduction in cost of the LNB.
  • FIG. 10 is a diagram illustrating an example process for LNB configuration to avoid aliasing overlap in accordance with one embodiment of the technology described herein.
  • the frequency bands of operation for the LNB are determined at operation 404.
  • the operating bands may already be determined for that system. Accordingly, in such applications, the frequency bands of operation are predetermined. In other instances such as where communication parameters such as these are being defined for the entire system, specification of the frequency bands of operation may be more flexible.
  • a sampling rate is determined for the analog-to-digital converter. As the above examples illustrate, it may not always be practical or possible to select a sampling rate sufficient to meet the Nyquist sampling criteria for all bands. Normal design considerations can be used to determine the sampling rate at this juncture. While it may be desired to sample at three to four, or even 5 to 10, times the frequency of the signal being sampled, this may not always be practical.
  • the oscillator frequency of the oscillator used for the downconversion to intermediate frequencies (IF) is selected. Again, normal design considerations can be used to select the oscillator frequency to target the desired higher frequencies. However, considerations at this stage are also given to the phenomenon of aliasing and whether the resultant IF signals above the Nyquist frequency will result in an alias that overlaps with the frequency ranges of the IF signals in Nyquist zone 1.
  • the oscillator frequency can be a frequency signal provided to the mixer with or without frequency multipliers or dividers used to adjust the final frequency. Additionally, a PLL can be used to adjust the frequency.
  • an oscillator frequency close to the frequency of the lowest frequency band lowers the resultant IF frequencies of the downconverted set, as compared to an oscillator frequency that is farther below the lowest frequency band.
  • This also brings the IF frequencies for frequency bands in Nyquist zone 2 closer to the Nyquist frequency, resulting in an alias of that frequency band at a higher frequency, increasing the likelihood that it will not overlap with the lower frequency bands after sampling.
  • the frequency bands are mapped into downconverted bands in there intermediate frequency ranges.
  • the alias or aliases are evaluated to determine whether they overlap in frequency with the Nyquist zone one signals. If there is no overlap, the design can be completed. This is illustrated at operation 420 of course, even if there is no overlap, the system can be adjusted to optimize the resultant sampled signals to ensure appropriate spacing between the bands or for other design considerations.
  • one or more system parameters can be adjusted and the system reevaluated with the adjusted parameters to ensure that there is no overlap. For example, at operation 422 one option for removing, or moving in the direction of removing, resulting overlap is to increase the sampling rate. Increasing the sampling rate may increase the frequency of the offending alias signals such that they no longer overlap the other signals after sampling. This is because the resultant alias is a function of the difference between the sampling rate and the sampled signal. Accordingly, the closer the sampling rate is to the frequency of the sampled signal, the higher the frequency of the aliased signal.
  • Another option for removing or moving in the direction of removing resulting overlap is to increase the oscillator frequency as shown at operation 424.
  • the higher the oscillator frequency the lower the resultant intermediate frequencies for the downconverted bands. This will generally provide more bandwidth between the highest intermediate frequency in Nyquist zone 1 and the new Nyquist frequency (i.e., the frequency boundary between Nyquist zone 1 and Nyquist zone 2. Also, as a result of this, the signals in Nyquist zone 2 fold down to a higher frequency range in Nyquist zone one, increasing the likelihood that they do not overlap with the other signals.
  • the oscillator frequency is too high, this could cause other interference including in Nyquist zone 1.
  • the oscillator frequency were chosen as a frequency between the first and second frequency bands, these two bands may overlap one another after downconversion. This of course will depend on the spacing between the frequency bands in the actual selection of the oscillator frequency.
  • one oscillator frequency was selected at 20.6 GHz, above the highest frequency band. The selection may work in some applications depending on the layout of the bands within the available bandwidth. However, in the example of figure 5, it still resulted in the Nyquist zone 2 signal folding down onto the other frequencies.
  • module might describe a given unit of functionality that can be performed in accordance with one or more embodiments of the technology disclosed herein.
  • a module might be implemented utilizing any form of hardware, software, or a combination thereof.
  • processors, controllers, ASICs, PLAs, PALs, CPLDs, FPGAs, logical components, software routines or other mechanisms might be implemented to make up a module.
  • the various modules described herein might be implemented as discrete modules or the functions and features described can be shared in part or in total among one or more modules.
  • computing module 500 may represent, for example, computing or processing capabilities found within desktop, laptop and notebook computers; hand-held computing devices (PDA's, smart phones, cell phones, palmtops, etc.); mainframes, supercomputers, workstations or servers; or any other type of special-purpose or general-purpose computing devices as may be desirable or appropriate for a given application or environment.
  • Computing module 500 might also represent computing capabilities embedded within or otherwise available to a given device.
  • a computing module might be found in other electronic devices such as, for example, digital cameras, navigation systems, cellular telephones, portable computing devices, modems, routers, WAPs, terminals and other electronic devices that might include some form of processing capability.
  • Computing module 500 might include, for example, one or more processors, controllers, control modules, or other processing devices, such as a processor 504.
  • Processor 504 might be implemented using a general-purpose or special-purpose processing engine such as, for example, a microprocessor, controller, or other control logic.
  • processor 504 is connected to a bus 502, although any communication medium can be used to facilitate interaction with other components of computing module 500 or to communicate externally.
  • Computing module 500 might also include one or more memory modules, simply referred to herein as main memory 508. For example, preferably random access memory (RAM) or other dynamic memory, might be used for storing information and instructions to be executed by processor 504. Main memory 508 might also be used for storing temporary variables or other intermediate information during execution of instructions to be executed by processor 504. Computing module 500 might likewise include a read only memory (“ROM”) or other static storage device coupled to bus 502 for storing static information and instructions for processor 504.
  • ROM read only memory
  • the computing module 500 might also include one or more various forms of information storage mechanism 510, which might include, for example, a media drive 512 and a storage unit interface 520.
  • the media drive 512 might include a drive or other mechanism to support fixed or removable storage media 514.
  • a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a CD or DVD drive (R or RW), or other removable or fixed media drive might be provided.
  • storage media 514 might include, for example, a hard disk, a floppy disk, magnetic tape, cartridge, optical disk, a CD or DVD, or other fixed or removable medium that is read by, written to or accessed by media drive 512.
  • the storage media 514 can include a computer usable storage medium having stored therein computer software or data.
  • information storage mechanism 510 might include other similar instrumentalities for allowing computer programs or other instructions or data to be loaded into computing module 500.
  • Such instrumentalities might include, for example, a fixed or removable storage unit 522 and a storage unit interface 520.
  • Such storage units 522 and a storage unit interfaces 520 can include a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, a PCMCIA slot and card, and other fixed or removable storage units 522 and a storage unit interfaces 520 that allow software and data to be transferred from the storage unit 522 to computing module 500.
  • Computing module 500 might also include a communications interface 524.
  • Communications interface 524 might be used to allow software and data to be transferred between computing module 500 and external devices.
  • Examples of communications interface 524 might include a modem or softmodem, a network interface (such as an Ethernet, network interface card, WiMedia, IEEE 802.XX or other interface), a communications port (such as for example, a USB port, IR port, RS232 port Bluetooth ® interface, or other port), or other communications interface.
  • Software and data transferred via communications interface 524 might typically be carried on signals, which can be electronic, electromagnetic (which includes optical) or other signals capable of being exchanged by a given communications interface 524. These signals might be provided to communications interface 524 via a channel 528.
  • This channel 528 might carry signals and might be implemented using a wired or wireless communication medium.
  • Some examples of a channel might include a phone line, a cellular link, an RF link, an optical link, a network interface, a local or wide area network, and other wired or wireless communications channels.
  • computer program medium and “computer usable medium” are used to generally refer to media such as, for example, memory 508, storage unit 522, media 514, and channel 528.
  • These and other various forms of computer program media or computer usable media may be involved in carrying one or more sequences of one or more instructions to a processing device for execution.
  • Such instructions embodied on the medium are generally referred to as “computer program code” or a “computer program product” (which may be grouped in the form of computer programs or other groupings). When executed, such instructions might enable the computing module 500 to perform features or functions of the disclosed technology as discussed herein.
  • module does not imply that the components or functionality described or claimed as part of the module are all configured in a common package. Indeed, any or all of the various components of a module, whether control logic or other components, can be combined in a single package or separately maintained and can further be distributed in multiple groupings or packages or across multiple locations.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

Un bloc à faible bruit peut comprendre : un convertisseur-abaisseur de fréquence comprenant un oscillateur et un mélangeur, le convertisseur-abaisseur de fréquence étant configuré pour convertir par abaissement de fréquence les bandes de fréquences prédéterminées à des bandes à fréquences intermédiaires, une des bandes de fréquences intermédiaires étant supérieure à une zone de Nyquist 1 ; et un convertisseur analogique-numérique ayant une première entrée couplée à une sortie du convertisseur-abaisseur et une seconde entrée couplée pour recevoir un signal d'échantillonnage à une fréquence d'échantillonnage. Une fréquence du signal fourni au mélangeur utilisé pour la conversion par abaissement de fréquence est sélectionnée de telle sorte que, lors de la conversion en symboles numériques par le convertisseur analogique-numérique, le repliement dû à la conversion n'entraîne pas l'une des bandes de fréquences intermédiaires supérieure à la zone de Nyquist 1 à se plier sur les autres bandes de fréquences intermédiaires.
PCT/US2015/024839 2015-04-08 2015-04-08 Architecture à faible bruit WO2016164005A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6091931A (en) * 1997-06-18 2000-07-18 Lsi Logic Corporation Frequency synthesis architecture in a satellite receiver
EP1693980A2 (fr) * 2005-02-21 2006-08-23 FTA Communication Technologies SARL Bloc convertisseur à faible bruit pour la réception de la radiodiffusion directe par satellite
US20070081578A1 (en) * 2005-10-11 2007-04-12 Fudge Gerald L Nyquist folded bandpass sampling receivers with narrow band filters for UWB pulses and related methods
US20090290659A1 (en) * 2008-05-21 2009-11-26 Entropic Communications, Inc. Channel stacking system and method of operation
US20140050212A1 (en) * 2012-08-15 2014-02-20 Andrew Llc Telecommunication System Using Multiple Nyquist Zone Operations
US8791849B1 (en) * 2013-03-14 2014-07-29 Raytheon Company Digital clock update methodology for multi-Nyquist constructive interference to boost signal power in radio frequency transmission

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6091931A (en) * 1997-06-18 2000-07-18 Lsi Logic Corporation Frequency synthesis architecture in a satellite receiver
EP1693980A2 (fr) * 2005-02-21 2006-08-23 FTA Communication Technologies SARL Bloc convertisseur à faible bruit pour la réception de la radiodiffusion directe par satellite
US20070081578A1 (en) * 2005-10-11 2007-04-12 Fudge Gerald L Nyquist folded bandpass sampling receivers with narrow band filters for UWB pulses and related methods
US20090290659A1 (en) * 2008-05-21 2009-11-26 Entropic Communications, Inc. Channel stacking system and method of operation
US20140050212A1 (en) * 2012-08-15 2014-02-20 Andrew Llc Telecommunication System Using Multiple Nyquist Zone Operations
US8791849B1 (en) * 2013-03-14 2014-07-29 Raytheon Company Digital clock update methodology for multi-Nyquist constructive interference to boost signal power in radio frequency transmission

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