CN102361463A - Radio frequency (RF) band selector - Google Patents
Radio frequency (RF) band selector Download PDFInfo
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- CN102361463A CN102361463A CN2011101403538A CN201110140353A CN102361463A CN 102361463 A CN102361463 A CN 102361463A CN 2011101403538 A CN2011101403538 A CN 2011101403538A CN 201110140353 A CN201110140353 A CN 201110140353A CN 102361463 A CN102361463 A CN 102361463A
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Abstract
The invention relates to a radio frequency (RF) band selector. The RF band selector is characterized by comprising a local oscillation (LO) divider, a phase-locking loop (PLL) phase-locking voltage controlled oscillator (VCO) circuit, an input output detection error signal processing feedback circuit, and an input matching unit, a variable gain amplification circuit, a front-end RF filter, a lower variable frequency mixer, a first intermediate-frequency amplifier, an intermediate-frequency filter, a second intermediate-frequency amplifier, an upper variable frequency mixer, a rear-end RF filter, a buffer amplifier and an output matching unit, which are sequentially connected, wherein an output end of the input output detection error signal processing feedback circuit is connected with a control end of the variable gain amplification circuit; the output end of the PLL phase-locking VCO circuit is connected to an input end of the LO divider; and an output end LO1 of the LO divider is connected to an LO input end of a circuit of the lower variable frequency mixer, and an output end LO2 of the LO divider is connected to the LO input end of the circuit of the upper variable frequency mixer. The in-band ripple deviation of the RF band selector is reduced, the delay of a development period is avoided, and production efficiency is improved.
Description
Technical field
The present invention relates to realize a kind of radio frequency band selector, particularly a kind of radio frequency band selector that can reduce the passband fluctuation deviation.
Background technology
Along with the swift and violent development at full speed of present mobile communication, the application of electromagnetic spectrum resource is constantly upwards expansion also, and hundreds of MHZ is more and more to the wireless communications application of GHZ frequency at present; In the certain space scope, electromagnetic spectrum has become a kind of rare resource, and the gsm mobile telephone system works is in 890 ~ 915MHZ and 935 ~ 960MHZ; The CDMA mobile telephone system works in 825 ~ 835MHZ and 870 ~ 880MHZ; Global positioning system (GPS), wireless lan (wlan), personal communication and 3G (Third Generation) Moblie (3G) etc.; Mobile communications network will continue to enlarge signal cover; Except increasing the base station, utilize wireless discharging-directly station as a kind of effective solution usually, imitate and economic means.Angle from emission; The signal spectrum of transmitter emission must be limited in the channel scope of being distributed in strictness; Otherwise will have influence on the normal use of the wireless device of adjacent channel; And receiver can only receive the radio signal that oneself belongs to channel, otherwise will receive the influence of adjacent channel.In these numerous system share, want system's inter-working and do not influence, use the radio frequency band selector to accomplish the physical signalling channel selection at place usually, to reduce transmit scattering, to receive problem such as crosstalk.
The essential structure of the repeater radio frequency band selector of selling in the market is as shown in Figure 1; Fig. 1 is a radio frequency band selector theory diagram commonly used: this radio frequency band selector comprise input matching unit, RF filter 1, on become that frequency mixer, intermediate frequency amplify 1, intermediate frequency filtering, intermediate frequency amplify 2, down change frequency mixer, RF filter 2, buffering amplify, output matching unit and splitter and PLL lock VCO circuit mutually, form a complete radio frequency band selector commonly used.Its operation principle is described below:
Radiofrequency signal is input to the radio frequency band selector, earlier through input matching circuit, entering sound table RF filtering 1 filtering again, after be input to the change frequency mixer; With VCO is through the local oscillation signal LO1 mixing of splitter output mutually from PLL lock, and down-conversion produces intermediate-freuqncy signal, amplify through intermediate-frequency tube 1 again get into that the intermediate-frequency filter filtering is spuious, unwanted signal such as outside the band; Get into intermediate-frequency tube 2 again and amplify, the back gets into change frequency mixer mixing down, with from the PLL lock mutually VCO through the local oscillation signal LO2 mixing of splitter output; Up-conversion produces radiofrequency signal; Entering sound table RF filtering 2, the unwanted signal such as spuious of having eliminated effectively that local-oscillator leakage, mixing produce, radiofrequency signal is amplified to certain amplitude through buffering; After output matching circuit output, this band selector has high squareness factor, suppress characteristic such as good.
The band bandwidth of radio frequency band selector have the single carrier wave 200KHZ of GSM signal bandwidth, have CDMA carrier wave 1.23MHz signal bandwidth, the physical channel bandwidth of WCDMA carrier wave 5MHz is arranged; Bigger bandwidth such as 1MHz, 5MHz, 10MHz, 15MHz are then arranged for multicarrier.Actual electronic devices and components have different responses to the unlike signal frequency, and as to identical high or low power input signal, the power output of different frequent points size maybe be different, fluctuation in Here it is the radio frequency band.And in the RF index of repeater the gain flatness in the radio frequency bandwidth is had higher requirement.And in the actual radio frequency band selector circuit design, passive filter such as employing sound table, intermediate-frequency filter and multistage amplification reach high squareness factor, suppress characteristic such as good.But these devices are responsive to the radio frequency band fluctuation; Bigger to gain fluctuation influence in being with; To repeatedly revise parameter through testing continuous debugging and production batch; And the parameter of device material batch exists error also can influence gain fluctuation in the band, and these factors all can be delayed construction cycle and production efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of radio frequency band selector that can reduce the passband fluctuation deviation.
The present invention adopts following scheme to realize: a kind of radio frequency band selector is characterized in that: comprise LO splitter, PLL lock phase VCO circuit, input and output detection of error signals handle feedback circuit and the input matching unit that connects successively, variable-gain amplification circuit, front end RF filter, down change frequency mixer, first intermediate frequency amplifier, intermediate-frequency filter, second intermediate frequency amplifier, on become frequency mixer, rear end RF filter, buffer amplifier, output matching unit; The output that said input and output detection of error signals is handled feedback circuit is connected with the control end of said variable-gain amplification circuit; The output of described PLL lock phase VCO circuit is connected to the input of LO splitter; The output LO1 of LO splitter is connected to down the local oscillator input and the output LO2 that become mixer and is connected to the local oscillator input that becomes mixer.
In an embodiment of the present invention, described input and output detection of error signals processing feedback circuit comprises input sampling circuit, incoming level testing circuit, output sampling circuit, output level testing circuit, difference amplification and error driving amplifier; The output port of described input sampling circuit is connected to the input of incoming level testing circuit; The output of incoming level testing circuit is connected to the first input end of difference channel; The output of difference channel is connected to the input of error driving amplifier circuit, and the output of error driving amplifier circuit is connected to the control end of variable gain circuit; The output port of output sampling circuit is connected to the input of output level testing circuit, and the output of output level testing circuit is connected to second input of difference channel.
Circuit structure of the present invention is simple, can effectively reduce the passband fluctuation deviation, can avoid delaying the construction cycle and enhance productivity, and has good practical values.
Description of drawings
Fig. 1 is a radio frequency band selector theory diagram commonly used.
Fig. 2 is the embodiment of the invention one a radio frequency band selector theory diagram.
Fig. 3 is the embodiment of the invention two radio frequency band selector theory diagrams.
Fig. 4 is a radio frequency band selector flatness control block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 2; The present invention provides a kind of radio frequency band selector, it is characterized in that: comprise LO splitter, PLL lock phase VCO circuit, input and output detection of error signals handle feedback circuit and the input matching unit that connects successively, variable-gain amplification circuit, front end RF filter, down change frequency mixer, first intermediate frequency amplifier, intermediate-frequency filter, second intermediate frequency amplifier, on become frequency mixer, rear end RF filter, buffer amplifier, output matching unit; The output that said input and output detection of error signals is handled feedback circuit is connected with the control end of said variable-gain amplification circuit; The output of described PLL lock phase VCO circuit is connected to the input of LO splitter; The output LO1 of LO splitter is connected to down the local oscillator input and the output LO2 that become mixer and is connected to the local oscillator input that becomes mixer.
In an embodiment of the present invention, described input and output detection of error signals processing feedback circuit comprises input sampling circuit, incoming level testing circuit, output sampling circuit, output level testing circuit, difference amplification and error driving amplifier; Please join Fig. 3; The output port of described input sampling circuit is connected to the input of incoming level testing circuit; The output of incoming level testing circuit is connected to the first input end of difference channel; The output of difference channel is connected to the input of error driving amplifier circuit, and the output of error driving amplifier circuit is connected to the control end of variable gain circuit; The output port of output sampling circuit is connected to the input of output level testing circuit, and the output of output level testing circuit is connected to second input of difference channel.
Concrete; Please continue with reference to Fig. 3; Can know by figure, this radio frequency band selector comprises input matching unit 101, variable-gain amplification circuit 102, front end RF filter 103, change frequency mixer 104, first intermediate frequency amplify 105 down, intermediate frequency filtering 106, second intermediate frequency amplify 107, on become that frequency mixer 108, rear end RF filter 109, buffering amplify 110, output matching unit 111, LO splitter 201, PLL lock phase VCO circuit 202, input sampling 301, incoming level detect 302, output sampling 306, output level detect 305 and difference amplify 304 and error driving amplifier 303.The output port of the input matching circuit 101 of said radio frequency band selector is connected to the input of variable-gain amplification circuit 102; The output of variable-gain amplification circuit 102 is connected to the input of front end RF filter 103; The output of front end RF filter 103 is connected to down the input that becomes mixer 104; The output that becomes mixer 104 down is connected to the input that first intermediate frequency amplifies 105 circuit; The output that first intermediate frequency amplifies 105 circuit is connected to the input port of intermediate frequency filtering circuit 106; The output port of intermediate frequency filtering circuit 106 is connected to the input of second IF amplifier circuit 107; The output of second IF amplifier circuit 107 is connected to the input that becomes mixer 108; The output of last change mixer 108 is connected to the input of rear end RF filter circuit 109, and the output of rear end RF filter circuit 109 is connected to the input of RF buffer amplifier circuit 110, and the output of RF buffer amplifier circuit 110 is connected to the input port of output matching circuit 111.The output port of the input sampling circuit 301 of said radio frequency band selector is connected to the input of incoming level testing circuit 302; The output of incoming level testing circuit 302 is connected to the input of difference channel 304; The output of difference channel 304 is connected to the input of error driving amplifier circuit 303, and the output of error driving amplifier circuit 303 is connected to the control end of variable gain circuit 102; The output port of output sampling circuit 306 is connected to the input of output level testing circuit 305, and the output of output level testing circuit 305 is connected to the input of difference channel 304.PLL lock phase VCO circuit 202 outputs of said modified model radio frequency band selector are connected to the input of LO splitter 201, and the output LO1 of LO splitter 201 is connected to down the local oscillator input and the output LO2 that become mixer 104 and is connected to the local oscillator input that becomes mixer 108.
In order to let those skilled in the art better understand the present invention, do further introduction in the face of radio frequency band selector operation principle of the present invention down:
Please continue with reference to figure 3 and Fig. 4; After input signal entering input mated 101, the output signal got into variable gain amplifier 102 amplifications (supposing that at this moment multiplication factor is Gt), after the interference signals such as its output signal entering front end RF filter 103 filtering mirror images; The output signal gets into change frequency mixer down and local oscillation signal Lo1 mixing from LO frequency divider 201; After the intermediate-freuqncy signals that mixing produces etc. got into the amplification of first intermediate frequency, the output signal got into intermediate-frequency filter 106 and leaches required intermediate-freuqncy signal, got into second intermediate frequency amplifier 107 again and amplified; The output signal get into to go up becomes frequency mixer 108 and local oscillator Lo2 mixing from LO frequency divider 201; The signals such as rf frequency that mixing produces get into rear end RF filter filtering 109, leach required radiofrequency signal and get into RF buffering amplification 110, and the output signal is gone into output matching circuit 111 back outputs.
Input sampling circuit 301 extracts input signal sample and gets into incoming level testing circuit 302, makes radiofrequency signal be converted into corresponding DC level, and its output direct current gets into the input port A of differential amplifier circuit 304.Output sampling circuit 306 extracts the output sample of signal and gets into output level testing circuit 305, makes radiofrequency signal be converted into corresponding DC level, and its output direct current also gets into differential amplifier circuit 304 input port B in addition.Two paths of signals produces error signal and gets into error driving amplifying circuit 303 through relatively amplifying, the multiplication factor that its output control variable gain amplifier 102 amplifies.Gain amplifier for any frequency signal in the radio frequency band selector is constant G0, supposes that variable gain amplifier 102 gains are Gt, and the gain that other link portions equivalence of module produces is Gk, radio frequency band selector overall gain G0=Gt+Gk.The Gk that the different frequency response variance is produced when device becomes big or when diminishing; Corresponding gain error is extracted circuit and is produced corresponding error signal and drive amplifying circuit 303 through error and variable gain amplifier 102 gain G t are diminished or become big; Overall gain G0 is constant, can reduce radio frequency band selector passband fluctuation deviation like this.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. radio frequency band selector is characterized in that: comprise LO splitter, PLL lock phase VCO circuit, input and output detection of error signals handle feedback circuit and the input matching unit that connects successively, variable-gain amplification circuit, front end RF filter, down change frequency mixer, first intermediate frequency amplifier, intermediate-frequency filter, second intermediate frequency amplifier, on become frequency mixer, rear end RF filter, buffer amplifier, output matching unit; The output that said input and output detection of error signals is handled feedback circuit is connected with the control end of said variable-gain amplification circuit; The output of described PLL lock phase VCO circuit is connected to the input of LO splitter; The output LO1 of LO splitter is connected to down the local oscillator input and the output LO2 that become mixer and is connected to the local oscillator input that becomes mixer.
2. radio frequency band selector according to claim 1 is characterized in that: described input and output detection of error signals is handled feedback circuit and is comprised input sampling circuit, incoming level testing circuit, output sampling circuit, output level testing circuit, difference amplification and error driving amplifier; The output port of described input sampling circuit is connected to the input of incoming level testing circuit; The output of incoming level testing circuit is connected to the first input end of difference channel; The output of difference channel is connected to the input of error driving amplifier circuit, and the output of error driving amplifier circuit is connected to the control end of variable gain circuit; The output port of output sampling circuit is connected to the input of output level testing circuit, and the output of output level testing circuit is connected to second input of difference channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110140353.8A CN102361463B (en) | 2011-05-27 | 2011-05-27 | Radio frequency (RF) band selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110140353.8A CN102361463B (en) | 2011-05-27 | 2011-05-27 | Radio frequency (RF) band selector |
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| Publication Number | Publication Date |
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| CN102361463A true CN102361463A (en) | 2012-02-22 |
| CN102361463B CN102361463B (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110140353.8A Expired - Fee Related CN102361463B (en) | 2011-05-27 | 2011-05-27 | Radio frequency (RF) band selector |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293493A (en) * | 1999-09-29 | 2001-05-02 | 株式会社东芝 | Autogain control circuit and receiver having said circuit |
| EP1569360A1 (en) * | 1995-01-04 | 2005-08-31 | Interdigital Technology Corporation | Spread-spectrum system and method |
| CN2775939Y (en) * | 2004-12-23 | 2006-04-26 | 北京东方信联科技有限公司 | Frequency selector for direct sending station of mobile communication |
-
2011
- 2011-05-27 CN CN201110140353.8A patent/CN102361463B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1569360A1 (en) * | 1995-01-04 | 2005-08-31 | Interdigital Technology Corporation | Spread-spectrum system and method |
| CN1293493A (en) * | 1999-09-29 | 2001-05-02 | 株式会社东芝 | Autogain control circuit and receiver having said circuit |
| CN2775939Y (en) * | 2004-12-23 | 2006-04-26 | 北京东方信联科技有限公司 | Frequency selector for direct sending station of mobile communication |
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| CN102361463B (en) | 2014-11-19 |
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Effective date of registration: 20170606 Address after: No. 7 building two Wufeng Street software Avenue Gulou District of Fuzhou city in Fujian province 350000 No. 89 Fuzhou Software Industrial Park Building Patentee after: Fujian three Yuan Da Technology Co., Ltd. Address before: 350003 Fujian city of Fuzhou Province Copper Road Software Park base in B District 7 Patentee before: Fujian Sunnada Communication Co., Ltd. |
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Granted publication date: 20141119 Termination date: 20200527 |
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