CN102694556A - Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index - Google Patents
Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index Download PDFInfo
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- CN102694556A CN102694556A CN2012101600066A CN201210160006A CN102694556A CN 102694556 A CN102694556 A CN 102694556A CN 2012101600066 A CN2012101600066 A CN 2012101600066A CN 201210160006 A CN201210160006 A CN 201210160006A CN 102694556 A CN102694556 A CN 102694556A
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Abstract
The invention discloses a second local oscillator circuit of an ultra short wave receiver with low-power consumption and high phase noise index, which consists of a low pass filter LPF1, a phase-locked loop, an amplifier LNA, a low pass filter LPF2 and a power divider. The phase-locked loop comprises a phase discriminator PD, a low pass filter LPF3 and a voltage controlled oscillator VCO which are all connected in to each other in sequence. One output of the voltage controlled oscillator VCO passes through the amplifier LNA and the low pass filter LPF2 in turn to connect with an input of the power divider. Another output of VCO goes through the high pass filter HPF to connect with the input end of the local oscillator signal of the phase discriminator PD. The voltage controlled oscillator VCO passes through a high pass filter HPF to connect with a local oscillation signal input end of the phase discriminator PD.The invention employs a phase-locked loop mode and positions thehigh pass filter on a feedback loop of the voltage controlled oscillator VCO, which improves the stray inhibition capability and anti-interference capability of the local oscillator circuit. By front and back filtering, the phase noise of the output signal is reduced and the output signal-to-noise ratio is improved. Furthermore, this local oscillator circuit is also characterized by a simple structure, low consumption and low cost.
Description
Technical field
The present invention relates to a kind of low-power consumption, high phase noise index ultra-short wave receiver second local oscillation circuit.
Background technology
Ultrashort wavelength is claimed metric wave again between 1～10 meter, it is better than shortwave that it propagates stability, receives the influence of season and variation round the clock little; Frequency is higher, and the frequency band broad can be used for multichannel communication; Modulation system adopts frequency modulation system usually, and signal to noise ratio is higher, and communication quality is better than shortwave; At present, the ultra short wave communication technology is widely used in transmitting business fields such as TV, FM broadcasting, radar, navigation and mobile communication.The ultra short wave communication system is made up of terminal station and relay station; The terminal station is provided with transmitter, receiver, carrier terminal and antenna; Relay station is provided with the transmitter and receiver and the respective antenna of sensible both direction, and receiver is the important component part of ultra short wave communication system.
Modern general purpose receiver more and more tends to the direction of high-performance, high integration in design process; On performance, require high linearity, great dynamic range, high sensitivity and the high-resolution of receiver; The linearity and antijamming capability that this just requires to improve as much as possible receiver reduce its distorted signals and the error rate.
After the input of ultrashort wave standard signal source, at first pass through amplitude limiter, yet amplify or the attenuator decay through amplifier; Accomplishing radio frequency dynamically adjusts; Select required frequency range through preselector then, signal is through being amplified by low noise amplifier behind the preselector, and low noise amplifier amplifies signal amplitude; Under the situation of certain gain, can the circuit noise of back be suppressed; Signal is through behind the LNA, through the image frequency signal about low pass filter filters out 8GHz.Signal is through behind the low pass filter; Carry out mixing with first local oscillation signal; Obtain intermediate-freuqncy signal, intermediate-freuqncy signal through carrying out mixing with second local oscillation signal after filtering and the processing and amplifying, obtains the second required intermediate-freuqncy signal again; From technical indicator, needing the second local oscillation circuit output frequency is the local oscillation signal of 3.45G～3.55GMHz.Yet the second traditional local oscillation circuit directly adopts the lock phase chip of integrated VCO to produce required frequency, guarantees power output through the one-level amplifier, behind amplifier, adds a band pass filter, filtering first-harmonic and high order harmonic component.Though this scheme is simple in structure, cost is lower, and phase noise index surplus is less, and power consumption is bigger.
Summary of the invention
The objective of the invention is to solve the deficiency of prior art, a kind of simple in structure, low-power consumption that signal to noise ratio is high, spuious inhibition is effective, high phase noise index ultra-short wave receiver second local oscillation circuit are provided.
The objective of the invention is to realize: low-power consumption, high phase noise index ultra-short wave receiver second local oscillation circuit through following technical scheme; It is made up of low pass filter LPF1, phase-locked loop, amplifier LNA, low pass filter LPF2 and power splitter, and phase-locked loop comprises phase discriminator PD, low pass filter LPF3 and the voltage controlled oscillator VCO that connects in order; The input of low pass filter LPF1 connects standard signal source; Its output links to each other with the signal source input of phase discriminator PD; The voltage output of phase discriminator PD is connected with the control voltage input terminal of voltage controlled oscillator VCO through low pass filter LPF3; One tunnel output of voltage controlled oscillator VCO is connected with the input of power splitter with low pass filter LPF2 through amplifier LNA successively; Another road output of voltage controlled oscillator VCO is connected with the input of high pass filter HPF, and the output of high pass filter HPF links to each other with the local oscillation signal input of phase discriminator PD.
Power splitter of the present invention is one minute eight power splitter, three tunnel frequencies output ground connection wherein, in addition five the tunnel export 3450～3550MHz respectively local oscillation signal.
Phase discriminator PD of the present invention adopts the HMC704 chip.
Voltage controlled oscillator VCO of the present invention adopts the V844LE02-LF chip.
Amplifier LNA of the present invention adopts the ERA-5SM chip.
The invention has the beneficial effects as follows: the structure that adopts phase-locked loop manner; Voltage controlled oscillator VCO one tunnel is directly exported; Feed back to phase discriminator behind the phase demodulation frequency that the output of another road is revealed from phase demodulation through high pass filter filtering and standard signal source carries out phase demodulation; The noise of phase discriminator output voltage and interference component by low pass filter filters out after control VCO its output frequency is pulled to standard signal source, improved the spuious inhibition ability and the antijamming capability of local oscillation circuit, spuious inhibition>=65dBc; Filtering before and after passing through has again reduced the phase noise of exporting signal, phase noise≤-100dBc/Hz10k at 3550M, improved output signal-to-noise ratio; In addition, this local oscillation circuit also has simple in structure, low in energy consumption and characteristics such as cost is low.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing: as shown in Figure 1; Low-power consumption, high phase noise index ultra-short wave receiver second local oscillation circuit; It is made up of low pass filter LPF1, phase-locked loop, amplifier LNA, low pass filter LPF2 and power splitter; Wherein, amplifier LNA adopts the ERA-5SM chip, and low pass filter LPF2 adopts the LFCN-3400 chip; Power splitter is one minute eight power splitter, and wherein the output of three tunnel frequencies is through grounding through resistance, and five the road distinguish output frequencies 3450～3550MHz, the local oscillation signal of P >=0dBm in addition.Phase-locked loop comprises phase discriminator PD, low pass filter LPF3 and the voltage controlled oscillator VCO that connects in order, and wherein, phase discriminator PD adopts the HMC704 chip, and voltage controlled oscillator VCO adopts the V844LE02-LF chip.The input of low pass filter LPF1 connects standard signal source; Its output links to each other with the signal source input of phase discriminator PD; The voltage output of phase discriminator PD is connected with the control voltage input terminal of voltage controlled oscillator VCO through low pass filter LPF3; One tunnel output of voltage controlled oscillator VCO is connected with the input of power splitter with low pass filter LPF2 through amplifier LNA successively; Another road output of voltage controlled oscillator VCO is connected with the input of high pass filter HPF, and the output of high pass filter HPF links to each other with the local oscillation signal input of phase discriminator PD.
Claims (5)
1. low-power consumption, high phase noise index ultra-short wave receiver second local oscillation circuit; It is characterized in that: it is made up of low pass filter LPF1, phase-locked loop, amplifier LNA, low pass filter LPF2 and power splitter, and phase-locked loop comprises phase discriminator PD, low pass filter LPF3 and the voltage controlled oscillator VCO that connects in order;
The input of low pass filter LPF1 connects standard signal source; Its output links to each other with the signal source input of phase discriminator PD; The voltage output of phase discriminator PD is connected with the control voltage input terminal of voltage controlled oscillator VCO through low pass filter LPF3; One tunnel output of voltage controlled oscillator VCO is connected with the input of power splitter with low pass filter LPF2 through amplifier LNA successively; Another road output of voltage controlled oscillator VCO is connected with the input of high pass filter HPF, and the output of high pass filter HPF links to each other with the local oscillation signal input of phase discriminator PD.
2. low-power consumption according to claim 1, high phase noise index ultra-short wave receiver second local oscillation circuit; It is characterized in that: described power splitter is one minute eight power splitter; Three tunnel frequencies output ground connection wherein, in addition five the tunnel export 3450～3550MHz respectively local oscillation signal.
3. low-power consumption according to claim 1, high phase noise index ultra-short wave receiver second local oscillation circuit is characterized in that: described phase discriminator PD adopts the HMC704 chip.
4. low-power consumption according to claim 1, high phase noise index ultra-short wave receiver second local oscillation circuit is characterized in that: described voltage controlled oscillator VCO adopts the V844LE02-LF chip.
5. low-power consumption according to claim 1, high phase noise index ultra-short wave receiver second local oscillation circuit is characterized in that: described amplifier LNA adopts the ERA-5SM chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210160006.6A CN102694556B (en) | 2012-05-22 | 2012-05-22 | Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210160006.6A CN102694556B (en) | 2012-05-22 | 2012-05-22 | Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index |
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| CN102694556A true CN102694556A (en) | 2012-09-26 |
| CN102694556B CN102694556B (en) | 2014-08-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067037A (en) * | 2012-12-28 | 2013-04-24 | 成都泰格微波技术股份有限公司 | Wireless ad hoc network MESH communication module |
| CN103906199A (en) * | 2012-12-24 | 2014-07-02 | 联想(北京)有限公司 | Signal output method and mobile terminal |
| CN105306051A (en) * | 2015-11-21 | 2016-02-03 | 扬州海科电子科技有限公司 | Broadband phase-locked source with small volume and low phase noise |
| CN106464275A (en) * | 2014-05-15 | 2017-02-22 | 高通股份有限公司 | Dynamic local oscillator (LO) scheme and switchable receive (RX) chain for carrier aggregation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103906199A (en) * | 2012-12-24 | 2014-07-02 | 联想(北京)有限公司 | Signal output method and mobile terminal |
| CN103067037A (en) * | 2012-12-28 | 2013-04-24 | 成都泰格微波技术股份有限公司 | Wireless ad hoc network MESH communication module |
| CN103067037B (en) * | 2012-12-28 | 2015-04-08 | 成都泰格微波技术股份有限公司 | Wireless ad hoc network MESH communication module |
| CN106464275A (en) * | 2014-05-15 | 2017-02-22 | 高通股份有限公司 | Dynamic local oscillator (LO) scheme and switchable receive (RX) chain for carrier aggregation |
| CN106464275B (en) * | 2014-05-15 | 2019-01-22 | 高通股份有限公司 | Method for wireless communications, device and non-transient computer-readable media |
| CN105306051A (en) * | 2015-11-21 | 2016-02-03 | 扬州海科电子科技有限公司 | Broadband phase-locked source with small volume and low phase noise |
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| CN102694556B (en) | 2014-08-13 |
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Denomination of invention: Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index Effective date of registration: 20160728 Granted publication date: 20140813 Pledgee: Agricultural Bank of China Limited by Share Ltd Chengdu West Branch Pledgor: Jiuhua Yuantong Science and Technology Development Co., Ltd., Chengdu Registration number: 2016510000036 |
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Date of cancellation: 20201224 Granted publication date: 20140813 Pledgee: Agricultural Bank of China Limited by Share Ltd. Chengdu West Branch Pledgor: CHENGDU JIUHUA YUANTONG TECHNOLOGY DEVELOPMENT Co.,Ltd. Registration number: 2016510000036 |
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