CN107888224B - A kind of radio transceiver machine - Google Patents
A kind of radio transceiver machine Download PDFInfo
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- CN107888224B CN107888224B CN201711361469.8A CN201711361469A CN107888224B CN 107888224 B CN107888224 B CN 107888224B CN 201711361469 A CN201711361469 A CN 201711361469A CN 107888224 B CN107888224 B CN 107888224B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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Abstract
The present invention provides a kind of radio transceiver machine comprising: modem；Emit link comprising digital analog converter, upconverter and power amplifier；Receives link comprising low-noise amplifier, frequency mixer, variable gain amplifier and analog-digital converter；It is multiplexed mode filter, including RX/TX control circuit, composite filter circuit and multiple selector, when the work of radio transceiver machine is in emission mode, the RX/TX control circuit controls the multiple selector, so that the input terminal and output end of composite filter circuit are connected with the input terminal of the output end of the digital analog converter and upconverter respectively by the multiple selector；When the work of radio transceiver machine is in reception pattern, institute's RX/TX control circuit controls the multiple selector, so that the input terminal and output end of composite filter circuit are connected with the input terminal of the output end of the frequency mixer and the variable gain amplifier respectively by the multiple selector.In this way, saving chip area, reduce costs.
Description
[technical field]
The present invention relates to electronic circuit technology field, in particular to a kind of radio transceiver machine.
[background technique]
Radio transceiver machine includes transmitter (TX) and receiver (RX).Transmitter (TX) is by modem
(MODEM) launched after signal is handled by antenna (ANTENNA)；Receiver (RX) receiving antenna signal, then carry out
Modem (MODEM) is given after the processing such as amplification, frequency conversion, filtering, digitlization.It please refers to shown in Fig. 1, is a kind of tradition
Radio transceiver machine circuit diagram, transmitter (TX) include digital analog converter (DAC), low-pass filter (LPF),
Upconverter (UPC) and power amplifier (PA)；Its receiver (RX) includes low-noise amplifier (LNA), frequency mixer
(MIXER), complex bandpass filters (CBPF), programmable gain amplifier (PGA), analog-digital converter (ADC).Due in tradition
Radio frequency transceiver in complex bandpass filters (CBPF) and low-pass filter (LPF) be it is simultaneous, foregoing circuit is right
Low frequency signal processes, its usual used capacitor is quite big, therefore consumes a large amount of chip areas.
Therefore, it is necessary to provide a kind of new solution to solve the above problems.
[summary of the invention]
One of the objects of the present invention is to provide a kind of radio transceiver machines, use multiplexing mode filter, can
It is used respectively as complex bandpass filters and low-pass filter, to save chip area.
To solve the above-mentioned problems, the present invention provides a kind of radio transceiver machine comprising: modem；Transmitting
Link comprising digital analog converter, upconverter and power amplifier；Receives link comprising low-noise amplifier, mixing
Device, variable gain amplifier and analog-digital converter；It is multiplexed mode filter, including RX/TX control circuit, composite filter circuit
And multiple selector, the RX/TX control circuit are connected with composite filter circuit and multiple selector, the composite filter
The input terminal and output end of wave device circuit are connected with multiple selector, and the composite filter circuit includes low-pass filter mould
Formula and complex bandpass filters mode, when the work of radio transceiver machine is in emission mode, the RX/TX control circuit is by institute
It states composite filter circuit and switches to low-pass filter mode, and the RX/TX control circuit controls the multiple selector,
So that composite filter circuit is connected in transmitting link by the multiple selector；When radio transceiver machine works
In reception pattern, the composite filter circuit is switched to complex bandpass filters by the RX/TX control circuit
(CBPF) mode, and RX/TX control circuit controls the multiple selector so that composite filter circuit pass through it is described more
Road selector is connected in receives link, when radio transceiver machine work in emission mode, the RX/TX control circuit control
The multiple selector is made, so that the input terminal and output end of composite filter circuit are distinguished by the multiple selector
It is connected with the input terminal of the output end of the digital analog converter and upconverter；When radio transceiver machine works in reception pattern
When, institute's RX/TX control circuit controls the multiple selector, so that the input terminal and output end of composite filter circuit are logical
The multiple selector is crossed to be connected with the input terminal of the output end of the frequency mixer and the variable gain amplifier respectively.
Compared with prior art, the radio transceiver machine in the present invention is using multiplexing mode filter, in less radio-frequency
Transceiver in a receive mode when switch to complex bandpass filters (CBPF), when radio transceiver machine is in emission mode
Low-pass filter (LPF) is switched to reduce costs to save chip area.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.Wherein:
Fig. 1 is a kind of circuit diagram of traditional radio transceiver machine；
Fig. 2 is the functional schematic of the multiplexing mode filter of the present invention in one embodiment；With
Fig. 3 is the circuit diagram of composite filter circuit in one embodiment in Fig. 2.
[specific embodiment]
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
" one embodiment " or " embodiment " referred to herein, which refers to, may be included at least one implementation of the invention
A particular feature, structure, or characteristic." in one embodiment " that different places occur in the present specification not refers both to same
A embodiment, nor the individual or selective embodiment mutually exclusive with other embodiments.Unless stated otherwise, herein
In connection, be connected, connect expression be electrically connected word indicate directly or indirectly to be electrical connected.
The present invention by Fig. 1 low-pass filter (LPF) and complex bandpass filters (CBPF) merge, design one
Kind of multiplexing mode filter, radio transceiver machine in a receive mode when be switched to complex bandpass filters (CBPF) mould
Formula, and be connected in receives link；It is switched to low-pass filter (LPF) mould when radio transceiver machine is in emission mode
Formula, and be connected in transmitting link, to save chip area, reduce costs.
It please refers to shown in Fig. 2, for the functional schematic of the multiplexing mode filter of the present invention in one embodiment.Fig. 2
Shown in multiplexing mode filter include RX/TX control circuit 210, composite filter circuit 220, the first multiple selector 230
With the second multiple selector 240.The composite filter circuit 220 includes low-pass filter (LPF) mode and plural band logical
Filter (CBPF) mode；The RX/TX control circuit 210 controls the mode of composite filter circuit 220, and controls simultaneously
First multiple selector 230 and the second multiple selector 240 are switched to the input of respective links, in output.
The first output end RX/TX_EN, second output terminal and the third output end of the RX/TX control circuit 210 respectively with
The composite filter circuit 220, the first multiple selector 230 are connected with the control terminal of the second multiple selector 240, described
First multiple selector 230 includes first input end 1, the second input terminal 2 and output end 3, and second multiple selector 240 is wrapped
Include input terminal 4, the first output end 5 and second output terminal 6, wherein 1 He of first input end of first multiple selector 230
First output end 5 of second multiple selector 240 respectively with corresponding output end and input in described reception (RX) link
End is connected；Second input terminal 2 of first multiple selector 230 and the second output terminal 6 of second multiple selector 240
It is connected respectively with corresponding output end in described transmitting (TX) link and input terminal, the output of first multiple selector 230
End 3 is connected with the input terminal of the composite filter circuit 220, the input terminal 4 of second multiple selector 240 with it is described
The output end of composite filter circuit 220 is connected.
When the work of radio transceiver machine is in emission mode, RX/TX control circuit 210 is electric by the multiplexing mode filter
Road 220 switches to low-pass filter (LPF) mode, and RX/TX control circuit 210 controls the output of the first multiple selector 230
End 3 is connected to its second input terminal 2, and controls input terminal 4 and its second output terminal 6 company of second multiple selector 240
It is logical, i.e., composite filter circuit 220 is connected to by first multiple selector 230 and the second multiple selector 240
In the transmitting link of the radio transceiver machine.When radio transceiver machine work in reception pattern, RX/TX control circuit
The composite filter circuit 220 is switched to complex bandpass filters (CBPF) mode, and RX/TX control circuit 210 by 210
The output end 3 for controlling the first multiple selector 230 is connected to its first input end 1, and controls second multiple selector 140
Input terminal 4 be connected to its first output end 5, that is, passing through first multiple selector 230 and the second multiple selector 240 will
Composite filter circuit 220 is connected in the receives link of the radio transceiver machine.
In one embodiment, if with multiplexing mode filter shown in Fig. 2 replace low-pass filter (LPF) in Fig. 1 and
Complex bandpass filters (CBPF), the then output end of the first input end 1 of the first multiple selector 230 and frequency mixer (MIXER)
It is connected, the second input terminal 2 is connected with the output end of digital analog converter (DAC)；First output end of the second multiple selector 240
5 are connected with the input terminal of programmable gain amplifier (PGA), the input terminal phase of second output terminal 6 and upconverter (UPC)
Even.When the work of radio transceiver machine is in emission mode, RX/TX control circuit 210 is by the composite filter circuit 220
Switch to low-pass filter (LPF) mode, and by first multiple selector 230 by composite filter circuit 220
Input terminal is connected with the output end of digital analog converter (DAC), by the second multiple selector 240 by composite filter circuit
220 output end is connected with the input terminal of upconverter (UPC)；When radio transceiver machine work in reception pattern, RX/TX
The composite filter circuit 220 is switched to complex bandpass filters (CBPF) mode by control circuit 210, and by described
The output end of the input terminal of composite filter circuit 220 and frequency mixer (MIXER) is passed through by the first multiple selector 230
Two multiple selector 240 are by the input terminal phase of the output end of composite filter circuit 220 and programmable gain amplifier (PGA)
Even.
It please refers to shown in Fig. 3, is the circuit diagram of composite filter circuit in one embodiment in Fig. 2.
Composite filter circuit shown in Fig. 3 includes input, output end, the first filter unit 310,320 and of the second filter unit
Switch unit 330.Wherein, the input terminal includes a pair of the road I differential input end and a pair of road Q differential input end, the output
End includes a pair of the road I difference output end and a pair of road Q difference output end.
First filter unit 310 includes the first input resistance R2_1, the second input resistance R2_2, the first operation amplifier
Device OP1, the first impedance unit 312 and the second impedance unit 314, wherein a pair of of road I differential input end passes through the first input respectively
Resistance R2_1 and the second input resistance R2_2 are connected with the non-inverting input terminal of the first operational amplifier OP1 and inverting input terminal, and one
It is connected respectively with the in-phase output end of the first operational amplifier OP1 and reversed-phase output to the road I difference output end, the first operation is put
It is connected with the first impedance unit 312 between the non-inverting input terminal and reversed-phase output of big device OP1, the first operational amplifier OP1's
The second impedance unit 314 is connected between inverting input terminal and in-phase output end.Second filter unit 320 includes that third is defeated
Enter resistance R2_3, the 4th input resistance R2_4, second operational amplifier OP2, third impedance unit 322 and the 4th impedance unit
324, wherein a pair of of road Q differential input end passes through third input resistance R2_3 and the 4th input resistance R2_4 and the second fortune respectively
Calculate amplifier OP2 non-inverting input terminal be connected with inverting input terminal, a pair of of road Q difference output end respectively with second operational amplifier
The in-phase output end of OP2 is connected with reversed-phase output, between the non-inverting input terminal and reversed-phase output of second operational amplifier OP2
It is connected with third impedance unit 322, is connected with the 4th between the inverting input terminal and in-phase output end of second operational amplifier OP2
Impedance unit 324.
The switch unit 330 includes first to fourth connection resistance R3_1-R3_4 and first to fourth switching switch K1-
K4, first to fourth connection resistance R3_1-R3_4 and first to fourth switching switch K1-K4 one-to-one correspondence, and cross-coupling in
Between first operational amplifier OP1 and second operational amplifier OP2.In the embodiment shown in fig. 3, the first operational amplifier
The second switching being sequentially connected in series is connected between the non-inverting input terminal of OP1 and the reversed-phase output of second operational amplifier OP2 to open
Close the connection resistance R3_2 of K2 and second, the inverting input terminal of the first operational amplifier OP1 and the same phase of second operational amplifier OP2
The first switching switch K1 being sequentially connected in series and the first connection resistance R3_1 are connected between output end；Second operational amplifier OP2
Non-inverting input terminal and the first operational amplifier OP1 in-phase output end between be connected be sequentially connected in series corresponding third switching
Switch K3 connects resistance R3_3, the inverting input terminal of second operational amplifier OP2 and the first operational amplifier with corresponding third
The corresponding 4th switching switch K4 and the 4th connection resistance R3_4 being sequentially connected in series, institute are connected between the reversed-phase output of OP1
State the of the control terminal of first to fourth switching switch K1-K4 in switch unit 330 with the RX/TX control circuit 210
One control terminal RX/TX_EN is connected, described when first to fourth switching switch K1-K4 conducting of the control of RX/TX control circuit 210
Composite filter circuit is in complex bandpass filters (CBPF) mode；When RX/TX control circuit 210 controls first to fourth
When switching switch K1-K4 cut-off, the composite filter circuit is in low-pass filter (LPF) mode.
In the embodiment shown in fig. 3, each impedance unit include be parallel to the first connecting pin and second connection end it
Between feedback resistance R1 and capacitor C1, and the resistance value of the feedback resistance R1 in each impedance unit is identical, and each impedance list
The capacitance of capacitor C1 in member is also identical；The resistance value of first to fourth input resistance R2_1-R2_4 is equal to resistance value R2, the
The resistance value of one to the 4th connection resistance R3_1-R3_4 is equal resistance value R3.
The working principle of composite filter circuit shown in Fig. 3 is introduced in detail below.
The mode of composite filter circuit shown in Fig. 3 is determined by the mode of radio transceiver machine.
When radio transceiver machine is in transmitting (TX) mode, the control switching of RX/TX control circuit 210 switch K1-K4
Cut-off, the circuit can be considered two mutually independent low-pass filters, and by the void of amplifier, short, resolution can be listed below node
Voltage expression are as follows:
S=j* ω substitution (1) is obtained into low-pass filter (LPF) transmission function are as follows:
Wherein, ViI, VoI are respectively the input of the road I, output, and ViQ, VoQ are respectively the input of the road Q, output, and j is imaginary factor,
ω is angular frequency, and R1 is the resistance value of feedback resistance R1, and C1 is the capacitance of capacitor C1, and R2 is input resistance R2_1-R2_4's
Resistance value.
By (2) formula it is found that realizing low-pass filter under transmitting (TX) mode (switching switch K1-K4 cut-off)
Function, its bandwidth are
When radio transceiver machine, which is in, receives (RX), the control switching switch K1-K4 conducting of RX/TX control circuit 210,
The circuit can be considered that two low-pass filters carry out cross-coupling by resistance R3_1-R3_4, and filter shows as plural number at this time
The input signal of bandpass filter (CBPF), processing is complex signal, can be listed below node voltage expression formula at this time are as follows:
Complex bandpass filters (CBPF) transmission function can be obtained by (3)+j* (4) and by s=j* ω substitution are as follows:
Wherein, ViI, VoI are respectively the input of the road I, output, and ViQ, VoQ are respectively the input of the road Q, output, and j is imaginary factor,
ω is angular frequency, and R1 is the resistance value of feedback resistance R1, and C1 is the capacitance of capacitor C1, and R2 is input resistance R2_1-R2_4's
Resistance value, R3 are the resistance value for connecting resistance R3_1-R3_4.
By (5) it is found that under reception (RX) mode (switching switch K1-K4 closure), pass through first to fourth connection resistance
After R3_1-R3_4 carries out cross-coupling, forms centre frequency and be located atBandwidth isComplex bandpass filters.
In conclusion providing a kind of radio transceiver machine in the present invention and can be applicable in radio transceiver machine
It is multiplexed mode filter, can be worked respectively in the case where radio transceiver machine is in and receives (RX) or transmitting (TX) mode in plural band logical
Filter (CBPF) mode or low-pass filter (LPF) mode, to realize the effect in transmitting terminal and receiving end multiplexing, section
About half filter area has been saved, the area of radio transceiver machine core piece has been reduced, reduces costs.
In the present invention, the word that the expressions such as " connection ", connected, " company ", " connecing " are electrical connected, unless otherwise instructed, then
Indicate direct or indirect electric connection.
It should be pointed out that any change that one skilled in the art does a specific embodiment of the invention
All without departing from the range of claims of the present invention.Correspondingly, the scope of the claims of the invention is also not merely limited to
In previous embodiment.
Claims (3)
1. a kind of radio transceiver machine, characterized in that it comprises:
Modem；
Emit link comprising digital analog converter, upconverter and power amplifier；
Receives link comprising low-noise amplifier, frequency mixer, variable gain amplifier and analog-digital converter；
It is multiplexed mode filter, including RX/TX control circuit, composite filter circuit and multiple selector,
The RX/TX control circuit is connected with composite filter circuit and multiple selector, the composite filter circuit
Input terminal and output end be connected with multiple selector, the composite filter circuit includes low-pass filter mode and plural number
Bandpass filter mode, when the work of radio transceiver machine is in emission mode, the RX/TX control circuit is by the composite
Filter circuit switches to low-pass filter mode, and the RX/TX control circuit controls the multiple selector, so that multiple
It is connected in transmitting link with mode filter circuit by the multiple selector；When the work of radio transceiver machine is receiving mould
When formula, the composite filter circuit is switched to complex bandpass filters (CBPF) mode by the RX/TX control circuit, and
RX/TX control circuit controls the multiple selector, so that composite filter circuit is connected by the multiple selector
In receives link,
When the work of radio transceiver machine is in emission mode, the RX/TX control circuit controls the multiple selector, so that
Input terminal and the output end for obtaining composite filter circuit are defeated with the digital analog converter respectively by the multiple selector
Outlet is connected with the input terminal of upconverter；
When the work of radio transceiver machine is in reception pattern, institute's RX/TX control circuit controls the multiple selector, so that
The input terminal and output end of composite filter circuit by the multiple selector respectively with the output end of the frequency mixer and
The input terminal of the variable gain amplifier is connected,
Composite filter circuit includes input, output end, the first filter unit, the second filter unit and switch unit, institute
The input terminal for stating composite filter circuit includes a pair of the road I differential input end and a pair of road Q differential input end, the composite
The output end of filter circuit includes a pair of the road I difference output end and a pair of road Q difference output end,
First filter unit includes the first input resistance, the second input resistance, the first operational amplifier, the first impedance unit
With the second impedance unit, wherein a pair of of road I differential input end passes through the first input resistance and the second input resistance and first respectively
The non-inverting input terminal of operational amplifier is connected with inverting input terminal, a pair of of road I difference output end respectively with the first operational amplifier
In-phase output end be connected with reversed-phase output, be connected between the non-inverting input terminal and reversed-phase output of the first operational amplifier
First impedance unit is connected with the second impedance unit between the inverting input terminal and in-phase output end of the first operational amplifier；Institute
Stating the second filter unit includes third input resistance, the 4th input resistance, second operational amplifier, third impedance unit and the 4th
Impedance unit, wherein a pair of of road Q differential input end passes through third input resistance respectively and the 4th input resistance is put with the second operation
The non-inverting input terminal of big device is connected with inverting input terminal, a pair of of road Q difference output end respectively with the same phase of second operational amplifier
Output end is connected with reversed-phase output, and third resistance is connected between the non-inverting input terminal and reversed-phase output of second operational amplifier
Anti- unit is connected with the 4th impedance unit between the inverting input terminal and in-phase output end of second operational amplifier,
The switch unit includes first to fourth connection resistance and first to fourth switching switch, first to fourth connection resistance
It is corresponded with first to fourth switching switch, and cross-coupling is between the first operational amplifier and second operational amplifier.
2. radio transceiver machine according to claim 1, which is characterized in that
It is connected with and is sequentially connected in series between the non-inverting input terminal of first operational amplifier and the reversed-phase output of second operational amplifier
The second switching switch and the second connection resistance, the inverting input terminal of the first operational amplifier and the same phase of second operational amplifier
The the first switching switch and the first connection resistance being sequentially connected in series are connected between output end；The homophase input of second operational amplifier
It is connected with the third switching switch being sequentially connected in series between end and the positive output end of the first operational amplifier and connects electricity with third
Resistance is connected between the inverting input terminal of second operational amplifier and the reversed-phase output of the first operational amplifier and to be sequentially connected in series
4th switching switch and the 4th connection resistance,
When first to fourth switching switch conduction of RX/TX control circuit control, the composite filter circuit is in plural number
Bandpass filter mode；When first to fourth switching switch cut-off of RX/TX control circuit control, the multiplexing mode filter electricity
Road is in low-pass filter mode.
3. radio transceiver machine according to claim 2, which is characterized in that
Each impedance unit includes the feedback resistance and capacitor being parallel between the first connecting pin and second connection end, and each
The resistance value of feedback resistance in impedance unit is identical, and the capacitance of the capacitor in each impedance unit is also identical；
The resistance value of first to fourth input resistance is equal, and the resistance value of first to fourth connection resistance is equal.
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| CN201711361469.8A CN107888224B (en) | 2017-12-18 | 2017-12-18 | A kind of radio transceiver machine |
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| CN201711361469.8A CN107888224B (en) | 2017-12-18 | 2017-12-18 | A kind of radio transceiver machine |
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| CN107888224B true CN107888224B (en) | 2019-08-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111404574B (en) * | 2020-04-02 | 2021-06-22 | 中国科学院微电子研究所 | Intermediate frequency device applied to WLAN zero intermediate frequency transceiver system |
| CN111934700A (en) * | 2020-08-17 | 2020-11-13 | 湖南艾科诺维科技有限公司 | Channel processing board card for acquisition and playback system |
| CN116582149B (en) * | 2023-07-11 | 2023-10-13 | 南京朗立微集成电路有限公司 | Radio frequency TRX intermediate frequency filter multiplexing circuit and WiFi radio frequency chip |
| CN117118475B (en) * | 2023-10-23 | 2024-01-26 | 南京朗立微集成电路有限公司 | Circuit supporting multiplexing of FX and RX channels of DPD and radio frequency chip |
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| CN102664600A (en) * | 2012-05-23 | 2012-09-12 | 东南大学 | Second-order complex band-pass filter circuit for implementing high-order complex filter |
| CN103151996A (en) * | 2013-03-01 | 2013-06-12 | 东南大学 | Reconfigurable filter |
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|---|---|---|---|---|
| CN101753159B (en) * | 2010-01-11 | 2013-07-10 | 清华大学 | RF (radio frequency) receiving front end with diversified gaining modes and capable of automatic tuning |
| CN102082579B (en) * | 2010-12-31 | 2013-10-30 | 东南大学 | Ultralow-power consumption constant-envelope transceiver system and implementation method thereof |
| CN102638240B (en) * | 2012-04-24 | 2014-10-22 | 无锡中科微电子工业技术研究院有限责任公司 | Double-mode type active power filter circuit with adjustable bandwidth |
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|---|---|---|---|---|
| CN102664600A (en) * | 2012-05-23 | 2012-09-12 | 东南大学 | Second-order complex band-pass filter circuit for implementing high-order complex filter |
| CN103151996A (en) * | 2013-03-01 | 2013-06-12 | 东南大学 | Reconfigurable filter |
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