CN102361463B - Radio frequency (RF) band selector - Google Patents

Radio frequency (RF) band selector Download PDF

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Publication number
CN102361463B
CN102361463B CN201110140353.8A CN201110140353A CN102361463B CN 102361463 B CN102361463 B CN 102361463B CN 201110140353 A CN201110140353 A CN 201110140353A CN 102361463 B CN102361463 B CN 102361463B
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China
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circuit
output
input
connected
lo
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CN201110140353.8A
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Chinese (zh)
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CN102361463A (en
Inventor
王振耀
黄海峰
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福建三元达通讯股份有限公司
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Publication of CN102361463A publication Critical patent/CN102361463A/en
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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

A kind of radio frequency band selector

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 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, hundreds of MHZ is more and more to the wireless communications application of GHZ frequency at present, within the scope of certain space, electromagnetic spectrum has become a kind of rare resource, gsm mobile telephone system works is in 890 ~ 915MHZ and 935 ~ 960MHZ, 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 expand signal cover, except increasing base station, conventionally utilize wireless discharging-directly station as a kind of effective solution, effect and economic means.Angle from transmitting, the signal spectrum of transmitter transmitting must strictly be limited within the scope of distributed channel, otherwise the normal use of the wireless device of adjacent channel will be had influence on, and receiver can only receive the radio signal of own place channel, otherwise the impact of adjacent channel will be subject to.In these numerous system share, want system inter-working and do not affect, conventionally with radio frequency band selector, complete the physical signalling channel selection at place, to reduce transmit scattering, receive the problem such as crosstalk.

The essential structure of the repeater radio frequency band selector of selling in the market as shown in Figure 1, Fig. 1 is conventional radio frequency band selector theory diagram: this radio frequency band selector comprises Input matching unit, RF filter 1, upper change frequency mixer, intermediate frequency amplification 1, intermediate frequency filtering, intermediate frequency amplification 2, lower change frequency mixer, RF filter 2, Hyblid Buffer Amplifier, output matching unit and splitter and the phase-locked VCO circuit of PLL, forms a complete conventional radio frequency band selector.Its operation principle is as described below:

Radiofrequency signal is input to radio frequency band selector, first through input matching circuit, enter again sound table RF filtering 1 filtering, after be input to change frequency mixer, with the local oscillation signal LO1 mixing through splitter output from the phase-locked VCO of PLL, and down-conversion produces intermediate-freuqncy signal, through intermediate-frequency tube 1, amplify again that to enter intermediate-frequency filter filtering spuious, the outer unwanted signal that waits of band, entering intermediate-frequency tube 2 amplifies again, after enter the mixing of lower change frequency mixer, with the local oscillation signal LO2 mixing through splitter output from the phase-locked VCO of PLL, up-conversion produces radiofrequency signal, enter sound table RF filtering 2, effectively eliminated local-oscillator leakage, the spuious unwanted signal that waits that mixing produces, radiofrequency signal arrives certain amplitude through Hyblid Buffer Amplifier, finally by output matching circuit, export, this band selector has high squareness factor, suppressed etc. characteristic.

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, have the physical channel bandwidth of WCDMA carrier wave 5MHz; For multicarrier, there are the larger bandwidth such as 1MHz, 5MHz, 10MHz, 15MHz.Actual electronic devices and components have different responses to unlike signal frequency, and as to formed objects power input signal, the power output of different frequent points size may be different, fluctuation in Here it is radio frequency band.And in the radio-frequency (RF) index of repeater, the gain flatness in radio frequency bandwidth is had to higher requirement.And in actual radio frequency band selector circuit design, the passive filters such as employing sound table, intermediate-frequency filter and multistage amplification reach high squareness factor, suppressed etc. characteristic.But these devices are more responsive to radio frequency band fluctuation, on being with interior gain fluctuation impact larger, to constantly debug by experiment with production batch and repeatedly revise parameter, and the parameter of device material batch exists error also can affect gain fluctuation in band, and these factors all can be delayed construction cycle and production efficiency.

Summary of the invention

The object of this invention is to provide a kind of radio frequency band selector that can reduce passband fluctuation deviation.

The present invention adopts following scheme to realize: a kind of radio frequency band selector, is characterized in that: comprise Input matching unit, variable-gain amplification circuit, front end RF filter, lower change frequency mixer, the first intermediate frequency amplifier, intermediate-frequency filter, the second intermediate frequency amplifier, upper change frequency mixer, rear end RF filter, buffer amplifier, output matching unit that LO splitter, the phase-locked VCO circuit of PLL, input and output detection of error signals are processed feedback circuit and connected successively; Described input and output detection of error signals is processed the output of feedback circuit and the control end of described variable-gain amplification circuit is connected; The phase-locked VCO circuit output of described PLL is connected to the input of LO splitter; The output LO1 of LO splitter is connected to the local oscillator input of lower change mixer and the local oscillator input that output LO2 is connected to change 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, differential amplification and error-driven 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-driven amplifier circuit, and the output of error-driven 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 the second input of difference channel.

Circuit structure of the present invention is simple, can effectively reduce passband fluctuation deviation, can avoid delaying the construction cycle and enhance productivity, and has good practical value.

Accompanying drawing explanation

Fig. 1 is conventional radio frequency band selector theory diagram.

Fig. 2 is the embodiment of the present invention one radio frequency band selector theory diagram.

Fig. 3 is the embodiment of the present invention two radio frequency band selector theory diagrams.

Fig. 4 is radio frequency band selector flatness control block diagram of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the present invention will be further described.

As shown in Figure 2, the invention provides a kind of radio frequency band selector, it is characterized in that: comprise Input matching unit, variable-gain amplification circuit, front end RF filter, lower change frequency mixer, the first intermediate frequency amplifier, intermediate-frequency filter, the second intermediate frequency amplifier, upper change frequency mixer, rear end RF filter, buffer amplifier, output matching unit that LO splitter, the phase-locked VCO circuit of PLL, input and output detection of error signals are processed feedback circuit and connected successively; Described input and output detection of error signals is processed the output of feedback circuit and the control end of described variable-gain amplification circuit is connected; The phase-locked VCO circuit output of described PLL is connected to the input of LO splitter; The output LO1 of LO splitter is connected to the local oscillator input of lower change mixer and the local oscillator input that output LO2 is connected to change 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, differential amplification and error-driven amplifier; Please refer to the drawing 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-driven amplifier circuit, and the output of error-driven 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 the second input of difference channel.

Concrete, continue referring to Fig. 3, as seen from the figure, this radio frequency band selector comprises Input matching unit 101, variable-gain amplification circuit 102, front end RF filter 103, lower change frequency mixer 104, the first intermediate frequency amplifies 105, intermediate frequency filtering 106, the second intermediate frequency amplifies 107, upper change frequency mixer 108, rear end RF filter 109, Hyblid Buffer Amplifier 110, output matching unit 111, LO splitter 201, the phase-locked VCO circuit 202 of PLL, input sampling 301, incoming level detects 302, output sampling 306, output level detects 305, and differential amplification 304 and error-driven amplifier 303.The output port of the input matching circuit 101 of described 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 the input of lower change mixer 104, the output of lower change mixer 104 is connected to the input that the first intermediate frequency amplifies 105 circuit, the output that the 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 the second intermediate frequency amplifier circuit 107, the output of the second intermediate frequency amplifier circuit 107 is connected to the input of change mixer 108, the output of upper change mixer 108 is connected to the input of rear end RF filter circuit 109, the output of rear end RF filter circuit 109 is connected to the input of RF buffer amplifier circuit 110, 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 described 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-driven amplifier circuit 303, and the output of error-driven 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.Phase-locked VCO circuit 202 outputs of PLL of described 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 the local oscillator input of lower change mixer 104 and the local oscillator input that output LO2 is connected to change mixer 108.

In order to allow those skilled in the art better understand the present invention, below radio frequency band selector operation principle of the present invention is described further:

Please continue to refer to Fig. 3 and Fig. 4, input signal enters after Input matching 101, output signal enters variable gain amplifier 102 and amplifies (supposing that at this moment multiplication factor is Gt), its output signal enters after the interference signals such as front end RF filter 103 filtering mirror images, output signal enter lower change frequency mixer with from the local oscillation signal Lo1 mixing of LO frequency divider 201, the intermediate-freuqncy signal that mixing produces etc. enters after the first intermediate frequency amplification, output signal enters intermediate-frequency filter 106 and leaches required intermediate-freuqncy signal, entering the second intermediate frequency amplifier 107 amplifies again, output signal enters change frequency mixer 108 and local oscillator Lo2 mixing from LO frequency divider 201, the signals such as rf frequency that mixing produces enter rear end RF filter filtering 109, leach required radiofrequency signal and enter RF Hyblid Buffer Amplifier 110, output signal enters the rear output of output matching circuit 111.

Input sampling circuit 301 extracts input signal sample and enters incoming level testing circuit 302, makes radiofrequency signal be converted into corresponding DC level, and its output direct current enters the input port A of differential amplifier circuit 304.Output sampling circuit 306 extracts output signal sample and enters output level testing circuit 305, makes radiofrequency signal be converted into corresponding DC level, and its output direct current also enters the another input port B of differential amplifier circuit 304.Two paths of signals, through relatively amplifying, produces error signal and enters error-driven amplifying circuit 303, and the multiplication factor that variable gain amplifier 102 amplifies is controlled in its output.Gain amplifier for any frequency signal in 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.When device becomes large or diminishes the Gk of different frequency response variance generation, corresponding gain error extraction circuit produces corresponding error signal makes variable gain amplifier 102 gain G t diminish or become large through error-driven amplifying circuit 303, overall gain G0 is constant, can reduce like this radio frequency band selector passband fluctuation deviation.

The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (1)

1. a radio frequency band selector, is characterized in that: comprise Input matching unit, variable-gain amplification circuit, front end RF filter, lower change frequency mixer, the first intermediate frequency amplifier, intermediate-frequency filter, the second intermediate frequency amplifier, upper change frequency mixer, rear end RF filter, buffer amplifier, output matching unit that LO splitter, the phase-locked VCO circuit of PLL, input and output detection of error signals are processed feedback circuit and connected successively; Described input and output detection of error signals is processed the output of feedback circuit and the control end of described variable-gain amplification circuit is connected; The phase-locked VCO circuit output of described PLL is connected to the input of LO splitter; The output LO1 of LO splitter is connected to the local oscillator input of lower change mixer, and the output LO2 of LO splitter is connected to the local oscillator input of change mixer; Described input and output detection of error signals is processed feedback circuit and is comprised input sampling circuit, incoming level testing circuit, output sampling circuit, output level testing circuit, differential amplifier circuit and error-driven 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 differential amplifier circuit, the output of differential amplifier circuit is connected to the input of error-driven amplifier circuit, and the output of error-driven 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 the second input of differential amplifier circuit.
CN201110140353.8A 2011-05-27 2011-05-27 Radio frequency (RF) band selector CN102361463B (en)

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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CN102361463B true CN102361463B (en) 2014-11-19

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Citations (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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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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.