CN204794979U - Wireless receiver circuit - Google Patents
Wireless receiver circuit Download PDFInfo
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- CN204794979U CN204794979U CN201520433397.3U CN201520433397U CN204794979U CN 204794979 U CN204794979 U CN 204794979U CN 201520433397 U CN201520433397 U CN 201520433397U CN 204794979 U CN204794979 U CN 204794979U
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Abstract
The utility model relates to a wireless receiver circuit, receive the link including antenna, two local oscillator signal generating circuit and radiofrequency signal, local oscillator signal generating circuit includes phase -locked loop circuit, frequency divider and BUFFER buffer circuit, and radiofrequency signal receives the link and includes radio frequency band pass filter, low -noise amplifier, mirror looks interference suppression wave filter, first order first detector, intermediate frequency band pass filter, second level first detector, radiofrequency signal 0 and the radiofrequency signal 1 who connects gradually along the signal transmission direction. This wireless receiver circuit adopts the double conversion structure, and mirror image inhibiting performance is good, greatly reduces the frequency dividing ratio, improves the loop bandwidth, improves the output phase noise of local oscillator signal, optimizes wireless receiver's sensitivity and interference immunity to effectively reduce the leakage of local oscillator signal to radio frequency front end signal and intermediate frequency signal.
Description
Technical field
The utility model relates to field of radio frequency circuit design, particularly relates to a kind of wireless receiver circuit.
Background technology
In the field of wireless communication, due to developing rapidly of the communication technology, propose strict requirement to wireless receiver, low-power consumption, high-performance, low cost, less size all become the problem must considered in design.At present, in various wireless communication system, all include high performance wireless receiver, such as WLAN (wireless local area network), satellite navigation system, RFID radio-frequency (RF) identification etc.But the wireless receiver be applied in these wireless communication systems is all much adopt single-conversion structure, causes mirror image rejection poor.Although some wireless receiver adopts double conversion structure, and what wherein provide the phase-locked loop frequency integrator of two-stage local oscillation signal to adopt is integer-N PLL structure, it is at special frequency, under the application that frequency dividing ratio is higher, the phase noise of local oscillation signal can be reduced, thus reduce sensitivity and the interference free performance of receiver.The local oscillation signal simultaneously inputted can lossy and leakage.
Utility model content
The technical problems to be solved in the utility model is to provide one to improve phase noise, and frequency agile configures, and the local oscillation signal of input reveals few a kind of wireless receiver circuit.
The technical scheme realizing the utility model object is: a kind of wireless receiver circuit, comprise antenna, two local oscillation signal circuit for generatings and rf signal reception link, two local oscillation signal circuit for generatings comprise phase-locked loop, frequency divider and BUFFER buffer circuit, the input of frequency divider connects the output of phase-locked loop, the output of frequency divider connects BUFFER buffer circuit input, rf signal reception link comprises the radio frequency band filter connected successively along signal transmission direction, low noise amplifier, mirror interfere rejects trap, first order frequency mixer, if bandpas filter, second level frequency mixer, variable gain amplifier and analog to digital converter, radio frequency band filter connects antenna, the local oscillator input of first order frequency mixer connects the output of first BUFFER buffer circuit, the local oscillator input of second level frequency mixer connects the output of second BUFFER buffer circuit.
As prioritization scheme of the present utility model, frequency divider is integer frequency divider or decimal frequency divider.
As prioritization scheme of the present utility model, be provided with low pass filter between second level frequency mixer and variable gain amplifier, the difference frequency signal that second level frequency mixer exports enters variable gain amplifier by the low pass filter removing High-frequency Interference.
The utility model has positive effect: (1) this wireless receiver circuit adopts double conversion structure, and by two frequency mixers, be namely provide two-stage local oscillation signal respectively by two independent phase-locked loops and two frequency dividers, mirror image rejection is good.
(2) this wireless receiver circuit can adopt integer or fractional frequency division scheme for generation of the frequency divider of local oscillation signal, wherein, fractional frequency division is compared with integral frequency divisioil, greatly can reduce frequency dividing ratio, improve loop bandwidth, improve the output phase noise of local oscillation signal, optimize sensitivity and the anti-interference of wireless receiver.
(3) the BUFFER buffer circuit between the local oscillation signal circuit for generating of this wireless receiver circuit and rf signal reception link effectively can reduce the leakage of local oscillation signal to radio-frequency front-end signal and intermediate-freuqncy signal.
Accompanying drawing explanation
In order to make content of the present utility model more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail:
Fig. 1 is circuit block diagram of the present utility model.
Wherein: 1, radio frequency band filter, 2, low noise amplifier, 3, mirror interfere rejects trap, 4, first order frequency mixer, 5, if bandpas filter, 6, second level frequency mixer, 7, low pass filter, 8, variable gain amplifier, 9, analog to digital converter, 11, phase-locked loop, 12, frequency divider, 13, BUFFER buffer circuit.
Embodiment
As shown in Figure 1, the utility model is a kind of wireless receiver circuit, comprise antenna, two local oscillation signal circuit for generatings and rf signal reception link, two local oscillation signal circuit for generatings include phase-locked loop 11, frequency divider 12 and BUFFER buffer circuit 13, the input of frequency divider 12 connects the output of phase-locked loop 11, the output of frequency divider 12 connects BUFFER buffer circuit 13 input, rf signal reception link comprises the radio frequency band filter 1 connected successively along signal transmission direction, low noise amplifier 2, mirror interfere rejects trap 3, first order frequency mixer 4, if bandpas filter 5, second level frequency mixer 6, variable gain amplifier 8 and analog to digital converter 9, radio frequency band filter 1 connects antenna, the local oscillator input of first order frequency mixer 4 connects the output of first BUFFER buffer circuit, the local oscillator input of second level frequency mixer 6 connects the output of second BUFFER buffer circuit.Wherein, the frequency divider in two local oscillation signal circuit for generatings is integer frequency divider or decimal frequency divider, is provided with the low pass filter 7 removing High-frequency Interference between second level frequency mixer 6 and variable gain amplifier 8.Wherein, phase-locked loop by phase discriminator, filter and voltage controlled oscillator three part form, BUFFER buffer circuit is buffer register.
Radio frequency band filter 1 has been decayed out of band signal, and mirror interfere rejects trap 3 has effectively been decayed mirror interfere.
Embodiment
As shown in Figure 1, first the radiofrequency signal received by antenna obtains radio-frequency input signals through radio frequency band filter 1, the filtered signal of radio frequency band filter 1 delivers to first order frequency mixer 4 after low noise amplifier 2 carries out low noise amplification, radio-frequency input signals after low noise amplifier 2 carries out low noise amplification delivers to first order frequency mixer 4, difference frequency is carried out with the first local oscillator input signals LO1, wherein, local oscillator input signals is lower than radio-frequency input signals, signal after difference frequency is the first intermediate-freuqncy signal, the input signal of the first intermediate-freuqncy signal as the second frequency conversion after if bandpas filter 5 filtering delivers to second level frequency mixer 6, carry out difference frequency again with the second local oscillator input signals LO2 sending into second level frequency mixer 6, wherein, local oscillator input signals is lower than radio-frequency input signals, then difference frequency signal is exported by second level frequency mixer 6, analog to digital converter 9 is entered as final intermediate-frequency after low pass filter 7 again by removing High-frequency Interference enters variable gain amplifier 8.Wherein, local oscillator input signals LO1 and LO2 is realized by phase-locked loop 11, frequency divider 12 and BUFFER buffer circuit 13.
The frequency conversion of two mixer stages all adopts low local oscillator, and namely LO1 signal frequency is lower than the radio-frequency input signals frequency of input first order frequency mixer 4, and LO2 signal frequency is lower than the first IF signal frequency of input second level frequency mixer 6.Adopt the mode of low local oscillator can improve the noiseproof feature of fractional frequency-division phase-locked loop, also can reduce extra power consumption.Because the first IF signal frequency is higher, the image disturbing signal of this wireless receiver circuit can well be suppressed.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1. a wireless receiver circuit, comprise antenna, two local oscillation signal circuit for generatings and rf signal reception link, it is characterized in that: two local oscillation signal circuit for generatings include phase-locked loop (11), frequency divider (12) and BUFFER buffer circuit (13), the input of described frequency divider (12) connects the output of phase-locked loop (11), the output of described frequency divider (12) connects BUFFER buffer circuit (13) input, described rf signal reception link comprises the radio frequency band filter (1) connected successively along signal transmission direction, low noise amplifier (2), mirror interfere rejects trap (3), first order frequency mixer (4), if bandpas filter (5), second level frequency mixer (6), variable gain amplifier (8) and analog to digital converter (9), described radio frequency band filter (1) connects antenna, the local oscillator input of first order frequency mixer (4) connects the output of first BUFFER buffer circuit, the local oscillator input of second level frequency mixer (6) connects the output of second BUFFER buffer circuit.
2. a kind of wireless receiver circuit according to claim 1, is characterized in that: described frequency divider is integer frequency divider or decimal frequency divider.
3. a kind of wireless receiver circuit according to claim 2, it is characterized in that: be provided with low pass filter (7) between described second level frequency mixer (6) and variable gain amplifier (8), the difference frequency signal that second level frequency mixer (6) exports enters variable gain amplifier (8) by the low pass filter (7) removing High-frequency Interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520433397.3U CN204794979U (en) | 2015-06-23 | 2015-06-23 | Wireless receiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520433397.3U CN204794979U (en) | 2015-06-23 | 2015-06-23 | Wireless receiver circuit |
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| CN204794979U true CN204794979U (en) | 2015-11-18 |
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| CN201520433397.3U Active CN204794979U (en) | 2015-06-23 | 2015-06-23 | Wireless receiver circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785138A (en) * | 2016-05-12 | 2016-07-20 | 北京森馥科技股份有限公司 | Frequency-selective electromagnetic radiation monitor |
| CN105897205A (en) * | 2016-04-06 | 2016-08-24 | 江苏星宇芯联电子科技有限公司 | Low-pass filtering variable gain instrument amplifier |
| CN108736904A (en) * | 2017-04-17 | 2018-11-02 | 东莞百电子有限公司 | A kind of novel VSAT receivers and transmitter |
| CN109167607A (en) * | 2018-10-12 | 2019-01-08 | 南京屹信航天科技有限公司 | It is a kind of for minimizing the radio circuit of ODU receiving channel |
| CN109164446A (en) * | 2018-09-19 | 2019-01-08 | 天津大学 | Two-band vital signs detecting radar system based on superhet and low intermediate frequency structure |
| CN109217886A (en) * | 2018-08-21 | 2019-01-15 | 北京无线电测量研究所 | A kind of two-way down conversion components |
| CN110138412A (en) * | 2019-06-03 | 2019-08-16 | 维沃移动通信有限公司 | A kind of electronic equipment |
| CN112332877A (en) * | 2019-08-05 | 2021-02-05 | 通用汽车环球科技运作有限责任公司 | Receiver apparatus |
| CN113078916A (en) * | 2021-03-26 | 2021-07-06 | 长沙驰芯半导体科技有限公司 | Ultra-wideband receiver interference suppression circuit and method for suppressing interference |
| CN115225106A (en) * | 2022-05-16 | 2022-10-21 | 河北东森电子科技有限公司 | Ultra-wideband Ka frequency band transceiving method |
-
2015
- 2015-06-23 CN CN201520433397.3U patent/CN204794979U/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897205A (en) * | 2016-04-06 | 2016-08-24 | 江苏星宇芯联电子科技有限公司 | Low-pass filtering variable gain instrument amplifier |
| CN105897205B (en) * | 2016-04-06 | 2018-08-07 | 江苏星宇芯联电子科技有限公司 | A kind of variable gain instrument amplifier of low-pass filtering |
| CN105785138A (en) * | 2016-05-12 | 2016-07-20 | 北京森馥科技股份有限公司 | Frequency-selective electromagnetic radiation monitor |
| CN108736904A (en) * | 2017-04-17 | 2018-11-02 | 东莞百电子有限公司 | A kind of novel VSAT receivers and transmitter |
| CN109217886A (en) * | 2018-08-21 | 2019-01-15 | 北京无线电测量研究所 | A kind of two-way down conversion components |
| CN109164446A (en) * | 2018-09-19 | 2019-01-08 | 天津大学 | Two-band vital signs detecting radar system based on superhet and low intermediate frequency structure |
| CN109167607A (en) * | 2018-10-12 | 2019-01-08 | 南京屹信航天科技有限公司 | It is a kind of for minimizing the radio circuit of ODU receiving channel |
| CN109167607B (en) * | 2018-10-12 | 2024-01-23 | 南京屹信航天科技有限公司 | Radio frequency circuit for miniaturized ODU receiving channel |
| CN110138412A (en) * | 2019-06-03 | 2019-08-16 | 维沃移动通信有限公司 | A kind of electronic equipment |
| CN112332877A (en) * | 2019-08-05 | 2021-02-05 | 通用汽车环球科技运作有限责任公司 | Receiver apparatus |
| CN112332877B (en) * | 2019-08-05 | 2022-05-27 | 通用汽车环球科技运作有限责任公司 | Receiver apparatus |
| CN113078916A (en) * | 2021-03-26 | 2021-07-06 | 长沙驰芯半导体科技有限公司 | Ultra-wideband receiver interference suppression circuit and method for suppressing interference |
| CN115225106A (en) * | 2022-05-16 | 2022-10-21 | 河北东森电子科技有限公司 | Ultra-wideband Ka frequency band transceiving method |
| CN115225106B (en) * | 2022-05-16 | 2023-12-01 | 河北东森电子科技有限公司 | Ultra-wideband Ka frequency band receiving and transmitting method |
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