WO2018133333A1

WO2018133333A1 - Power detection device for multi-channel radio-frequency input signal detection

Info

Publication number: WO2018133333A1
Application number: PCT/CN2017/091047
Authority: WO
Inventors: 曹丽萍
Original assignee: 深圳国人通信股份有限公司
Priority date: 2017-01-19
Filing date: 2017-06-30
Publication date: 2018-07-26
Also published as: CN206472134U

Abstract

The present invention relates to a power detection device for multi-channel radio-frequency input signal detection. The device comprises an input interface for inputting multi-channel radio-frequency input signals, a radio-frequency switch part connected to the input interface and used for receiving signals input by the input interface and selecting radio-frequency input signals to be subjected to power detection, a power detection part connected to the radio-frequency switch part and used for receiving radio-frequency input signals sent by the radio-frequency switch part and carrying out power detection, a micro-processor connected to the power detection part and used for controlling the radio-frequency switch part and the power detection part, and a temperature detection part connected to the micro-processor and used for detecting the temperature of the power detection part and sending a value of the detected temperature to the micro-processor. In the present invention, the input power of multi-channel radio-frequency input signals on different frequency bands can be detected in real time, and a high integration level and low costs are realized.

Description

Description: Inventive name: Power detection device for multi-channel RF input signal detection

[0001] The present invention relates to a power detecting device, and more particularly to a power detecting device for detecting multiple radio frequency input signals.

Background technique

[0002] Multi-system integration platform (POI, POINT OF INTERFACE) is mainly used in large-scale buildings and municipal facilities that require multiple network access to effectively realize multi-signal multi-band combining functions. The POI monitoring part needs to perform real-time detection on the input power of the multi-channel RF signal, and send the detected effective power value to the monitoring board through the 485 interface.

[0003] A conventional power detecting device performs input power detection for each radio frequency signal separately. The advantage is that the circuit principle is simple and easy to implement, and avoids mutual interference between detection signals; the disadvantage is that multiple detection modules are required, and the whole device has a large volume, high cost and low integration. technical problem

Problem solution

Technical solution

[0004] The object of the present invention is to overcome the deficiencies of the above technologies, and provide a power detecting device for detecting multiple channels of radio frequency input signals, which has high integration and can detect the power of multiple RF input signals.

[0005] A power detecting apparatus for multi-channel radio frequency input signal detection includes an input interface for inputting multiple radio frequency input signals, and an input interface connected to the input interface for receiving the input interface. Inputting a signal and selecting a radio frequency switch portion of the radio frequency input signal to be power-detected; a power detecting portion connected to the radio frequency switch portion for receiving the radio frequency input signal sent by the radio frequency switch portion and performing power detection a microprocessor connected to the power detecting portion for controlling the radio frequency switching portion and the power detecting portion; connected to the microprocessor for detecting a temperature of the power detecting portion and detecting The temperature value is sent to the temperature detecting portion of the microprocessor.

[0006] Further, the radio frequency switching portion includes a plurality of first-level radio frequency switches and a plurality of second-level radio frequency switches, and two input ends of each of the first-level radio frequency switches are respectively adjacent to each other Two-way RF input signal The input interface is connected, and the outputs of the two adjacent first-stage RF switches are respectively connected to two input terminals of the second-stage RF switch.

[0007] Further, the microprocessor is configured to output a high level and a low level to control the on and off between the two input ends and the output end of the first stage radio frequency switch, and output an off control signal to control the second stage. On and off between the two inputs and outputs of the RF switch.

[0008] Further, the insertion loss of the first-stage RF switch and the second-stage RF switch is 0.65~1.04 dB

The isolation is 44~65 decibels and the return loss is 14~24 decibels.

[0009] Further, the power detecting portion includes a plurality of detecting tubes and a plurality of temperature compensating circuits connected in one-to-one correspondence with the plurality of detecting tubes; each of the detecting tubes corresponds to one of the second-level radio frequency switches, And connecting to the output terminal of the corresponding second-stage radio frequency switch; the detecting tube is configured to convert the received radio frequency input signal into a corresponding detection voltage value, and send the signal to the microprocessor; each of the temperature compensation circuits Connected to the temperature detecting portion, configured to perform temperature compensation according to the temperature value detected by the temperature detecting portion and the detected voltage value detected by the corresponding detecting tube, and send the temperature compensation value to the microprocessor; The processor is configured to detect a power value of the corresponding radio frequency input signal according to the detection voltage value and the temperature compensation value.

[0010] Further, the temperature compensation circuit has a temperature compensation range of −25° C. to +55° C.

[0011] Further, the temperature detecting portion includes an analog temperature sensor, the analog scale sensor has a detection scale factor of 10 millivolts per degree Celsius, and the output voltage value ranges from 100 millivolts to 2000 millivolts.

[0012] Further, the analog temperature sensor detects a temperature range of -40 ° C to + 125 ° C.

[0013] Further, further comprising a bottom plate, a cover plate mounted to the bottom plate, and a PCB board mounted between the bottom plate and the cover plate, wherein the cover plate and the PCB board form mutually independent RF signal cavities Detecting a cavity and a control cavity, each of the radio frequency input signals is located in one of the radio frequency signal cavities, and the power detecting portion and the microprocessor are respectively disposed on the PCB board and are respectively located in the detecting cavity And the control chamber.

[0014] Further, a portion of the PCB between the two adjacent RF signal cavities is provided with a notch.

Advantageous effects of the invention

Beneficial effect

[0015] The present invention can effectively detect the input power of multiple frequency input signals of different frequency bands, and can make the power detection range It achieves ≥40 dB, detection accuracy of ±2dB, high integration and low cost.

Brief description of the drawing

DRAWINGS

1 is a schematic block diagram of a power detecting device for multi-channel RF input signal detection according to the present invention; [0017] FIG. 2 is a schematic structural view of a cover sub-chamber of the power detecting device shown in FIG.

3 is a schematic view of a PCB board of the power detecting device shown in FIG. 1.

Embodiments of the invention

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Referring to FIG. 1, a power detecting apparatus for multi-channel RF input signal detection includes: an input interface for inputting multiple RF input signals; and an input interface for receiving an input interface; The input signal selects the radio frequency switching portion 20 of the radio frequency input signal for power detection; the power detecting portion connected to the radio frequency switching portion 20 for receiving the radio frequency input signal transmitted by the radio frequency switching portion 20 and performing power detection 30; a microprocessor 50 connected to the power detecting portion 30, for controlling the RF switching portion 20 and the power detecting portion 30; connected to the microprocessor 50 for detecting the temperature of the power detecting portion 30 and detecting the temperature The value is sent to the temperature detecting portion 40 of the microprocessor 50.

[0021] The present invention is further described by taking power detection of 12 radio frequency input signals as an example. The 12 RF input signals are named RFIN_1 RF input signal, RFIN_2 RF input signal, RFIN_3 RF input signal... RFIN_11 RF input signal, RFIN_12 RF input signal. The 12-channel RF input signal ranges from 800MHz to 2.3GHz, including 2G/3G/4G signals.

[0022] The radio frequency switching portion 20 includes six first-level radio frequency switches 21 and three second-level radio frequency switches 22, and two input ends of each first-level radio frequency switch 21 are respectively adjacent to two adjacent channels. The input interface of the RF input signal is connected. For example, the two input ends of the first first stage RF switch 21 are respectively connected to the input interfaces of the RFIN_1 RF input signal and the RFI N_2 RF input signal, and the second first stage RF switch is connected. The two inputs of 21 are connected to the RFIN_3 RF input signal and the input interface of the RFIN_4 RF input signal, and so on. The outputs of the adjacent two first-stage RF switches 21 are respectively connected to the two input ends of a second-stage RF switch 22, for example, the outputs of the first and second first-stage RF switches 21 respectively Connected to two inputs of the first second stage RF switch 22, the outputs of the third and fourth first stage RF switches 21 respectively Connected to the two inputs of the second second stage RF switch 22, and so on.

[0023] The microprocessor 50 is configured to output high and low levels to control the on and off between the two input terminals and the output end of the first stage radio frequency switch 21 and to output two control signals to control the second stage radio frequency switch 22 On and off between input and output.

[0024] Taking the first and second first stage radio frequency switches 21 and the corresponding first second stage radio frequency switch 22 as an example, the microprocessor 50 outputs the first second stage radio frequency switch 22 The first input terminal's chirp signal and the second second stage radio frequency switch 22's second input terminal turn off signal, then the first first stage RF switch 21 output and the first second stage RF 22 is turned on, microprocessor 50 outputs a high level to the first first stage RF switch 21, then the first input of the first first stage RF switch 21 and the first first stage The output of the RF switch 21 is turned on,

The RFIN_1 RF input signal is turned on, the RFIN_2 RF input signal, the RFIN_3 RF input signal, and the RFI N_4 RF input signal are turned off, thereby selecting the RFIN_1 RF input signal for power detection.

[0025] The microprocessor 50 outputs the first input of the first second stage radio frequency switch 22 and the off signal of the second input of the first second stage radio frequency switch 22, then the first The output of the first stage RF switch 21 is connected to the first second stage RF switch 22, and the microprocessor 50 outputs a low level to the first first stage RF switch 21, then the first The second input of the first-stage RF switch 21 is connected to the output of the first first-stage RF switch 21, the RFIN_2 RF input signal is turned on, the RFIN_1 RF input signal, the RF IN_3 RF input signal, and the RFIN_4 RF input. The signal is turned off, thereby selecting the RFIN_2 RF input signal for power detection.

The microprocessor 50 outputs the chirp signal of the second input of the first second stage radio frequency switch 22 and the off signal of the first input end of the first second stage radio frequency switch 22, and then the second The output of the first stage RF switch 21 is connected to the first second stage RF switch 22, and the microprocessor 50 outputs a high level to the second first stage RF switch 21, then the second The first input of the primary RF switch 21 is connected to the output of the second first stage RF switch 21, the RFIN_3 RF input signal is activated, the RFIN_1 RF input signal, the RF IN_2 RF input signal, and the RFIN_4 RF input. The signal is turned off, thereby selecting the RFIN_3 RF input signal for power detection.

[0027] The microprocessor 50 outputs a chirp signal of the second input of the first second stage radio frequency switch 22 and a turn off signal of the first input end of the first second stage radio frequency switch 22, and then the second First level RF switch 21 The output is connected to the first second stage RF switch 22, the microprocessor 50 outputs a low level to the second first stage RF switch 21, and the second first stage RF switch 21 is second. The input terminal is connected to the output of the second first-stage RF switch 21, the RFIN_4 RF input signal is turned on, the RFIN_1 RF input signal, the RF IN_2 RF input signal, and the RFIN_3 RF input signal are turned off, thereby selecting the RFIN_4 RF input. The signal is tested for power.

[0028] In this way, the RF switch section 20 can simultaneously select three RF input signals of different frequency bands for power detection.

, can save time.

[0029] In this embodiment, the insertion loss of the first stage radio frequency switch 21 and the second stage radio frequency switch 22 is 0.65 to 1.04 decibels, the isolation is 44 to 65 decibels, and the return loss is 14 to 24 decibels, and the frequency is The range is 50MHz~6000MHz, and the Pldb value is about 35dBm.

[0030] The power detecting portion 30 includes three detecting tubes 31 and three temperature compensating circuits (not shown) connected to the three detecting tubes 31 one-to-one. The detector tube 31 is an RMS detector tube, operating at a frequency of 100 MHz to 3.9 G Hz, with a detection accuracy of ±ldB, and an input dynamic range of -65 dBm to +7 dBm, which has good temperature stability. Each detector tube 31 corresponds to a second stage RF switch 22 and is coupled to the output of the second stage RF switch 22. The detector tube 31 is operative to convert the received RF input signal to a corresponding detection voltage value and to the microprocessor 50. Each temperature compensating circuit is connected to the temperature detecting portion 40 for temperature compensation based on the temperature value detected by the temperature detecting portion 40 and the detected detecting voltage value detected by the detecting tube 31, and transmits the temperature compensation value to the microprocessor 50. The microprocessor 50 is configured to detect the power value of the corresponding RF input signal based on the detected voltage value and the temperature compensation value. For example, the RF switch section 20 selects the RFIN_1 RF input signal, the RFIN_5 RF input signal, and the RFIN_9 RF input signal for power detection. The corresponding three detectors 31 will receive the RFIN_1 RF input signal, the RFIN_5 RF input signal, and the RFIN_9 RF input. The signals are respectively converted into corresponding detection voltage values, and sent to the microprocessor 50, and the corresponding three temperature compensation circuits perform temperature compensation according to the temperature value detected by the temperature detecting portion 40 and the detection voltage value detected by the corresponding detector tube 31, and The temperature compensation value is sent to the microprocessor 50, and the microprocessor 50 can detect the power values of the corresponding RFIN_1 RF input signal, RFIN_5 RF input signal, and RFIN_9 RF input signal according to the detection voltage value and the temperature compensation value.

[0031] In this embodiment, the temperature compensation circuit has a temperature compensation range of −25° C. to +55° C.

[0032] The temperature detecting portion 40 includes an analog temperature sensor 41, and the detection scale factor of the analog temperature sensor 51 is 10 millivolts per degree Celsius, the output voltage range is 100 millivolts to 2000 millivolts, and the detected temperature value is obtained by outputting the voltage value to the microprocessor 50. The detected temperature range is -40 ° C to + 125 ° C. The detection accuracy is ±2 °C. The analog temperature sensor 41 is adjacent to the detector tube 31 to detect a relatively accurate temperature value.

Referring to FIGS. 2 and 3, the power detecting device of the present invention further includes a bottom plate, a cover plate 80 mounted to the bottom plate, and a PCB board 90 mounted between the bottom plate and the cover plate 80, and formed between the bottom plate and the cover plate 80. A box body having a size of 172.7 mm * 61.1 mm * 22 mm. PCB board adopts double panel, FR-4 board, dielectric constant 1.2-4. 6, thickness 0.8mm, gold plating process, size 172.6mm*61mm, top surface distribution component and RF trace of PCB board 90, The bottom surface distributes the control line traces.

[0034] The cover plate 80 and the PCB board 90 form mutually independent 12 RF signal cavities 81, the detection cavity and the control cavity 83, and the power supply cavity 84. Each RF input signal is located in a RF signal cavity 81. Internally, the spatial isolation between the RF input signals is guaranteed to ensure the isolation between the RF input signals. 1 2 RF signal cavities 81 are sequentially distributed from left to right along one side of the cover plate 80, and the RF input signal frequencies of the 12 RF signal cavities 81 are 2370 MHz-2390 MHz, 2320 MHz-2370 MHz from left to right. 2300 MHz-2320 MHz, 2130 MHz-2170 MHz, 2110 MHz-2130 MHz, 2010 MHz-2025 MHz, 1885 MHz-1815 MHz, 1860 MHz-1880 MHz, 1840 MHz-1860 MHz, 1805 MHz-1830 MHz. A portion of the PCB board 90 located between the adjacent two RF signal cavities 81 is provided with a notch 91, which reduces interference between the RF input signals of each channel, and further ensures spatial isolation between the RF input signals of the respective channels. .

[0035] The power detecting portion 30, the microprocessor 50 and the power supply portion are respectively disposed on the PCB board 90 and are respectively located in the detecting cavity, the control cavity 83, and the power supply cavity 84. The detection chamber is further divided into three independent detection tubes, which are placed in the cavity 82, and three detection tubes 31 are respectively located in the three detection tube placement chambers 82.

[0036] The present invention can effectively detect the power of multiple frequency input signals of different frequency bands, and can achieve a power detection range of ≥40 (18, detection accuracy ±2dB, high integration, low cost; The design and the box cavity design meet the high isolation requirements between the RF input signals, ensuring the accuracy of power detection.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the inventive concept. Combinations of the various features in the various embodiments, etc., are all within the scope of the invention.

Claims

Claim

[Claim 1] A power detecting apparatus for detecting a plurality of radio frequency input signals, comprising: an input interface for inputting a plurality of radio frequency input signals;

And a radio frequency switch portion connected to the input interface for receiving an input signal of the input interface and selecting a radio frequency input signal for performing power detection;

a power detecting portion connected to the radio frequency switching portion for receiving a radio frequency input signal sent by the radio frequency switching portion and performing power detection;

a microprocessor coupled to the power detecting portion for controlling the radio frequency switching portion and the power detecting portion;

Connected to the microprocessor for detecting the temperature of the power detecting portion and transmitting the detected temperature value to a temperature detecting portion of the microprocessor.

[Claim 2] The power detecting device for multi-channel radio frequency input signal detection according to claim 1, wherein: the radio frequency switching portion includes a plurality of first-level radio frequency switches and a plurality of second levels Radio frequency switching, the two input ends of each of the first stage radio frequency switches are respectively connected with the input interfaces of the adjacent two radio frequency input signals, and the output ends of the two adjacent first stage radio frequency switches are respectively Connected to two inputs of one of the second stage radio frequency switches.

[Claim 3] The power detecting device for multi-channel radio frequency input signal detection according to claim 2, wherein: the microprocessor is configured to output two high and low levels to control the first stage radio frequency switch The switching between the input and the output and the output switching control signal control the on and off between the two inputs and the output of the second stage RF switch.

[Claim 4] The power detecting device for multi-channel radio frequency input signal detection according to claim 2, wherein: the insertion loss of the first-stage radio frequency switch and the second-stage radio frequency switch is 0. 65 1.04 decibels, isolation is 44~65 decibels, and return loss is 14~24 decibels.

[Claim 5] The power detecting device for multi-channel radio frequency input signal detection according to claim 2, wherein: the power detecting portion includes a plurality of detecting tubes and one-to-one correspondence with the plurality of detecting tubes a plurality of temperature compensation circuits; each of the detection tubes corresponding to one of the second stage radio frequency switches, and connected to an output of the corresponding second stage radio frequency switch; the detection tube And configured to convert the received RF input signal into a corresponding detection voltage value, and send the same to the microprocessor; each of the temperature compensation circuits is coupled to the temperature detecting portion for detecting according to the temperature detecting portion The temperature value and the detection voltage value detected by the corresponding detector tube are temperature compensated, and the temperature compensation value is sent to the microprocessor; the microprocessor is configured to detect the corresponding value according to the detection voltage value and the temperature compensation value The power value of the RF input signal.

[Claim 6] The power detecting device for multi-channel RF input signal detection according to claim 5, wherein: the temperature compensation circuit has a temperature compensation range of -25 ° C to + 55 ° C.

[Claim 7] The power detecting device for multi-channel radio frequency input signal detection according to claim 1, wherein: the temperature detecting portion includes an analog temperature sensor, and the detecting scale factor of the analog temperature sensor is 10 At millivolts per degree Celsius, the output voltage range is from 100 millivolts to 2000 millivolts.

[Claim 8] The power detecting device for multi-channel RF input signal detection according to claim 7, wherein: the temperature range detected by the analog temperature sensor is -40 ° C to + 125 ° C

[Claim 9] The power detecting device for multi-channel RF input signal detection according to claim 1, further comprising: a bottom plate, a cover plate mounted to the bottom plate, and a PCB mounted between the bottom plate and the cover plate a plurality of radio frequency signal cavities, a detection cavity and a control cavity formed independently of each other between the cover plate and the PCB board, wherein each of the radio frequency input signals is located in one of the radio frequency signal cavities, The power detecting portion and the microprocessor are respectively disposed on the PCB board and are respectively located in the detecting cavity and the control cavity.

[Claim 10] The power detecting device for multi-channel RF input signal detection according to claim 9, wherein: the PCB board is located at a portion between adjacent two RF signal cavities. notch.