CN107612568A - A kind of radio-frequency front-end receiving circuit and its implementation - Google Patents
A kind of radio-frequency front-end receiving circuit and its implementation Download PDFInfo
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- CN107612568A CN107612568A CN201710819347.2A CN201710819347A CN107612568A CN 107612568 A CN107612568 A CN 107612568A CN 201710819347 A CN201710819347 A CN 201710819347A CN 107612568 A CN107612568 A CN 107612568A
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Abstract
The invention discloses a kind of radio-frequency front-end receiving circuit and its implementation, including：Antenna；Duplexer, the path switching of different frequency scope is realized under the control of antenna switch control signal；Tunable resonator, tunable filter is determined according to filter control signal and adjusts its variable element；Antenna-matching circuit, match circuit is determined according to antenna match control signal and adjusts working frequency, realizes the impedance matching between duplexer and tunable filter；Match circuit is received and dispatched, match circuit is determined according to transmitting-receiving match control signal and adjusts working frequency, realizes the impedance matching between tunable filter and transceiver；Transceiver, the radiofrequency signal treated through different frequency range path that the antenna is received are demodulated, and Frequency Band Selection signal is sent to control signal generator；Control signal generator, according to Frequency Band Selection signal output antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal.
Description
Technical field
The present invention relates to technical field of radio frequency integrated circuits, more particularly to a kind of radio-frequency front-end receiving circuit and its realization side
Method.
Background technology
With developing rapidly for mobile communication technology, radio-frequency front-end receiving circuit is increasingly sophisticated.At present, domestic the whole network leads to hand
Machine, which generally requires, supports the frequency of six mould 18, and 8 or 9 receiving paths of design are usually required in hardware circuit design.
Current radio-frequency front-end receiving circuit is opened by antenna, duplexer, wave filter or duplexer, transceiver and antenna
Close and wave filter, the match circuit between wave filter and transceiver form.Often increase a Band (frequency band), it is necessary to be opened in antenna
Close increases a wave filter and two groups of matchings between transceiver, as shown in figure 1, in traditional radio-frequency front-end receiving circuit,
When there are n bar RX paths, then n wave filter and 2n group match circuits are needed.
It can be seen that the radio-frequency front-end receiving circuit of current phone is excessively complicated, substantial amounts of PCB (printed circuit board) skies are occupied
Between, in addition, to add, can only change in the design phase without the Band (frequency band) of design, later stage to existing pcb board
Plate, it is unfavorable for the flexible design of circuit.
The content of the invention
To overcome above-mentioned the shortcomings of the prior art, the purpose of the present invention is to provide a kind of radio-frequency front-end receiving circuit
And its implementation, with realize it is a kind of can with the radio-frequency front-end receiving circuit of flexible configuration, reduce radio-frequency front-end receiving circuit account for
Pcb board area, while improve the flexibility of design.
For the above-mentioned purpose, technical scheme provided by the invention is as follows：
A kind of radio-frequency front-end receiving circuit, including：
Antenna, for the electromagnetic wave in reception space and electric signal is translated into, at follow-up radio circuit
Reason；
Duplexer, different frequencies are realized under the control for the antenna switch control signal exported in control signal generator
The path switching of rate scope, the antenna is connected to the path of multiple different frequency scopes；
Tunable resonator, the filter control signal for being exported according to control signal generator determine adjustable filtering
Device simultaneously adjusts its variable element, tunable filter is operated in different frequency bands；
Antenna-matching circuit, the antenna match control signal for being exported according to control signal generator determine match circuit
And working frequency is adjusted, realize the impedance matching between the duplexer and tunable resonator；
Match circuit is received and dispatched, the transmitting-receiving match control signal for being exported according to control signal generator determines match circuit
And working frequency is adjusted, realize the impedance matching between the tunable resonator and transceiver；
Transceiver, the radiofrequency signal treated by different frequency range path for the antenna to be received are solved
Adjust, and send Frequency Band Selection signal to control signal generator according to the actual requirements；
Control signal generator, for the Frequency Band Selection signal behavior corresponding band according to the transceiver and export corresponding
Antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal.
Further, the path of the multiple different frequency scope leads to including three low-frequency range, Mid Frequency, high band physics
Road.
Further, the tunable resonator includes：
Low-frequency filter, for when the filter control signal is low-frequency filter control signal, in the low frequency
Filter control signal control lower adjustment variable element, radiofrequency signal is filtered to allow low-frequency range radiofrequency signal by hindering
Only other frequency range radiofrequency signals pass through；
Intermediate-frequency filter, for when the filter control signal is intermediate-frequency filter control signal, in the intermediate frequency
Filter control signal control lower adjustment variable element, radiofrequency signal is filtered to allow Mid Frequency radiofrequency signal by hindering
Only other frequency range radiofrequency signals pass through；
High frequency filter, for when the filter control signal is high frequency filter control signal, in the high frequency
Filter control signal control lower adjustment variable element, radiofrequency signal is filtered to allow high band radiofrequency signal by hindering
Only other frequency range radiofrequency signals pass through.
Further, the antenna-matching circuit includes：
Low-frequency antenna match circuit, for when the antenna match control signal is low-frequency antenna match control signal,
Controlled in the low-frequency antenna match control signal and lower full employment parameter, the low-frequency filter of low-frequency range and the antenna are opened
Close matching；
Intermediate frequency antenna-matching circuit, for when the antenna match control signal is intermediate frequency antenna match control signal,
Controlled in the intermediate frequency antenna match control signal and lower full employment parameter, the intermediate-frequency filter of Mid Frequency and the antenna are opened
Close matching；
High frequency antenna match circuit, for when the antenna match control signal is high frequency antenna match control signal,
Controlled in the high frequency antenna match control signal and lower full employment parameter, the high frequency filter of high band and the antenna are opened
Close matching.
Further, the transmitting-receiving match circuit includes：
Low frequency receives and dispatches match circuit, for when the transmitting-receiving match control signal is that low frequency receives and dispatches match control signal,
Full employment parameter is lowered in low frequency transmitting-receiving match control signal control, by the low-frequency filter of low-frequency range and the transceiver
Matching；
Medium-frequency receiving and sending match circuit, in it is described transmitting-receiving match control signal be medium-frequency receiving and sending match control signal when,
Controlled in the medium-frequency receiving and sending match control signal and lower full employment parameter, by the intermediate-frequency filter of Mid Frequency and the transceiver
Matching；
High frequency receives and dispatches match circuit, for when the transmitting-receiving match control signal is that high frequency receives and dispatches match control signal,
Full employment parameter is lowered in high frequency transmitting-receiving match control signal control, by the high frequency filter of high band and the transceiver
Matching.
Further, the control signal that the match circuit includes being exported by the control signal generator controls variable
Electric capacity and variable inductance.
To reach above-mentioned purpose, the present invention also provides a kind of implementation method of radio-frequency front-end receiving circuit, including following step
Suddenly：
Step 1, control signal generator is according to the Frequency Band Selection signal behavior corresponding band from transceiver and exports phase
Antenna match control signal, filter control signal, transmitting-receiving match control signal and the antenna switch control signal answered；
Step 2, duplexer determine corresponding path, antenna match electricity under antenna switch control signal control
Road, tunable resonator and transmitting-receiving match circuit are respectively in the antenna match control signal, filter control signal, receipts
Send out and determine corresponding match circuit and tunable filter under the control of match control signal and carry out corresponding running parameter adjustment.
Further, if transceiver output Frequency Band Selection signal is the selection signal of low-frequency range, the control letter
Number generator output low frequency antenna match signal, low-frequency filter control signal, low frequency transmitting-receiving match control signal and control
The antenna switch control signal of low-frequency range path, the duplexer determine low frequency under antenna switch control signal control
The path of section, the antenna-matching circuit, tunable resonator and transmitting-receiving match circuit are respectively in the low-frequency antenna
Determination low-frequency antenna matching electricity under the control of match control signal is received and dispatched with control signal, low-frequency filter control signal, low frequency
Road, low-frequency filter and low frequency transmitting-receiving match circuit simultaneously carry out corresponding running parameter adjustment.
Further, if transceiver output Frequency Band Selection signal is the selection signal of Mid Frequency, the control letter
Number generator output intermediate frequency antenna match signal, intermediate-frequency filter control signal, medium-frequency receiving and sending match control signal and control
The antenna switch control signal of Mid Frequency path, the duplexer determine intermediate frequency under antenna switch control signal control
The path of section, the antenna-matching circuit, tunable resonator and transmitting-receiving match circuit are respectively in the intermediate frequency antenna
With control signal, intermediate-frequency filter control signal, medium-frequency receiving and sending match control signal control under determine intermediate frequency antenna match electricity
Road, intermediate-frequency filter and medium-frequency receiving and sending match circuit simultaneously carry out corresponding running parameter adjustment.
Further, if transceiver output Frequency Band Selection signal is the selection signal of high band, the control letter
Number generator output high frequency antenna matched signal, high frequency filter control signal, high frequency transmitting-receiving match control signal and control
The antenna switch control signal of high band path, the duplexer determine high frequency under antenna switch control signal control
The path of section, the antenna-matching circuit, tunable resonator and transmitting-receiving match circuit are respectively in the high frequency antenna
Determination high frequency antenna matching electricity under the control of match control signal is received and dispatched with control signal, high frequency filter control signal, high frequency
Road, high frequency filter and high frequency transmitting-receiving match circuit simultaneously carry out corresponding running parameter adjustment.
Compared with prior art, the beneficial effect of a kind of radio-frequency front-end receiving circuit of the present invention and its implementation is：
A kind of radio-frequency front-end receiving circuit of the present invention and its implementation are by designing three physical channels, using adjustable filter
Ripple device and adjustable match circuit, by changing its parameter, it is worked in different channels, the branch to all frequency bands can be achieved
Hold, realize it is a kind of can with the radio-frequency front-end receiving circuit of flexible configuration, its can reduce receiving circuit occupancy pcb board face
Product, while improve the flexibility of design.
Brief description of the drawings
Fig. 1 is the system architecture diagram of traditional radio-frequency front-end receiving circuit；
Fig. 2 is a kind of system architecture diagram of radio-frequency front-end receiving circuit of the present invention；
Fig. 3 is a kind of system architecture diagram of the preferred embodiment of radio-frequency front-end receiving circuit of the present invention；
Fig. 4 is the structural representation of the specific embodiment of the invention；
Fig. 5 is a kind of step flow chart of the implementation method of radio-frequency front-end receiving circuit of the present invention.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically show in each figure, they are not represented
Its practical structures as product.In addition, so that simplified form readily appreciates, there is identical structure or function in some figures
Part, one of those is only symbolically depicted, or only marked one of those.Herein, "one" is not only represented
" only this ", the situation of " more than one " can also be represented.
In one embodiment of the invention, as shown in Fig. 2 a kind of radio-frequency front-end receiving circuit of the present invention, including：Antenna
201st, duplexer 202, tunable resonator 203, antenna-matching circuit 204, transmitting-receiving match circuit 205, transceiver 206 with
And control signal generator 207.
Wherein, antenna 201, for the electromagnetic wave in reception space and electric signal is translated into, so as to follow-up radio frequency electrical
Road (antenna-matching circuit, tunable filter, transmitting-receiving match circuit and transceiver) is handled, and the resonance range of the antenna should
Cover all frequency ranges (Band) of their location.
Duplexer 202, realized under the control for the antenna switch control signal exported in control signal generator 207
The path switching of different frequency scope, antenna 201 is connected to the path of multiple different frequency scopes.Of the invention specific real
Apply in example, the path of three different frequency scopes, respectively high band High Band (being more than 2000Mhz), Mid Frequency are set
Middle Band (1800-2000Mhz) and low-frequency range Low Band (850-900Mhz).
Tunable resonator 203, including one or more tunable filters, for being exported in control signal generator 207
Filter control signal under determine tunable filter and to adjust its variable element, tunable filter is operated in different frequencies
Band, to filter out unwanted out of band signal and interference, in the specific embodiment of the invention, if filter control signal is filtered for low frequency
Ripple device control signal, it is determined that be operated in low-frequency range Low Band (850-900Mhz) low-frequency filter and adjust its variable ginseng
Number, radiofrequency signal is filtered to allow low-frequency range Low Band (850-900Mhz) radiofrequency signals by preventing other frequency ranges
Radiofrequency signal passes through；If filter control signal is intermediate-frequency filter control signal, it is determined that is operated in Middle Band
The intermediate-frequency filter of (1800-2000Mhz) simultaneously adjusts its variable element, radiofrequency signal is filtered to allow Mid Frequency Middle
Band (1800-2000Mhz) radiofrequency signals are by preventing other frequency range radiofrequency signals from passing through；If filter control signal is height
Frequency filter control signal, it is determined that be operated in high band High Band (being more than 2000Mhz) high frequency filter and adjust it
Variable element, radiofrequency signal is filtered to allow high band High Band (being more than 2000Mhz) radiofrequency signal by preventing
Other frequency range radiofrequency signals pass through.
Antenna-matching circuit 204, using one or more adjustable match circuits, for being exported in control signal generator 207
Determination match circuit and working frequency is adjusted under the control of antenna match control signal, realize duplexer 202 and adjustable filtering
Impedance matching between device circuit 203 so that signal reflects in transmission and the energy of loss is minimum.Specifically, if antenna
It is low-frequency antenna match control signal with control signal, then controls antenna-matching circuit 204 to become low-frequency antenna matching electricity
Road simultaneously adjusts working frequency, and low-frequency range Low Band (850-900Mhz) low-frequency filter is matched with duplexer；If
Antenna match control signal is intermediate frequency antenna match control signal, then controls antenna-matching circuit 204 to become intermediate frequency antenna
Match circuit simultaneously adjusts working frequency, by Mid Frequency Middle Band (1800-2000Mhz) intermediate-frequency filter and antenna
Switch matching；If antenna match control signal is high frequency antenna match control signal, control antenna-matching circuit 204 make its into
For high frequency antenna match circuit and working frequency is adjusted, by the high frequency filter of high band High Band (being more than 2000Mhz)
Matched with duplexer.In the specific embodiment of the invention, match circuit includes variable capacitance and variable inductance, is believed by controlling
Number generator 207, can adjust the value of variable capacitance and variable inductance, it is worked in different frequencies.
Match circuit 205 is received and dispatched, using one or more adjustable match circuits, for being exported in control signal generator 207
Receive and dispatch determination match circuit under the control of match control signal and adjust working frequency, realize transceiver 206 and tunable filter
Impedance matching between circuit 203 so that signal reflects in transmission and the energy of loss is minimum.Specifically, if transmitting-receiving matching
Control signal is that low frequency receives and dispatches match control signal, then control transmitting-receiving match circuit 205 becomes low frequency transmitting-receiving match circuit
And working frequency is adjusted, low-frequency range Low Band (850-900Mhz) low-frequency filter is matched with transceiver；If transmitting-receiving
Match control signal is medium-frequency receiving and sending match control signal, then control transmitting-receiving match circuit 205 becomes medium-frequency receiving and sending matching
Circuit simultaneously adjusts working frequency, by Mid Frequency Middle Band (1800-2000Mhz) intermediate-frequency filter and transceiver
Match somebody with somebody；If it is that high frequency receives and dispatches match control signal to receive and dispatch match control signal, control transmitting-receiving match circuit 205 becomes high frequency
Transmitting-receiving match circuit simultaneously adjusts working frequency, by high band High Band (being more than 2000Mhz) high frequency filter and transmitting-receiving
Device matches.Equally, match circuit here may also comprise variable capacitance and variable inductance, can by control signal generator 207
To adjust the value of variable capacitance and variable inductance, it is set to work in different frequencies.
Transceiver 206, the radiofrequency signal treated by different frequency range path for antenna to be received are demodulated,
It is then fed into CPU to be further processed, while sends Frequency Band Selection letter to control signal generator 207 according to the actual requirements
Number.
Control signal generator 207, for receiving the Frequency Band Selection signal behavior corresponding band from transceiver 206 and defeated
Go out corresponding antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal.
Fig. 3 is a kind of detail structure chart of RF front-end circuit preferred embodiment of the present invention., should in this preferred embodiment
Radio-frequency front-end receiving circuit includes duplexer 10, low-frequency antenna match circuit 20, low-frequency filter 30, low frequency transmitting-receiving matching electricity
Road 40, intermediate frequency antenna-matching circuit 50, intermediate-frequency filter 60, medium-frequency receiving and sending match circuit 70, high frequency antenna match circuit 80, height
Frequency wave filter 90, high frequency transmitting-receiving match circuit 100, transceiver 110, control signal generator 120 and antenna 130.
Wherein, duplexer 10, for different frequency will to be connected the antenna under the control of antenna switch control signal
The path of scope, three paths, respectively low-frequency range Low Band (850-900Mhz), Mid Frequency be present in the present embodiment
Middle Band (1800-2000Mhz), high band High Band (being more than 2000Mhz), respectively comprising respective antenna match
Circuit, wave filter and transmitting-receiving match circuit；Low-frequency antenna match circuit 20 is made up of variable capacitance and variable inductance, for low
By low-frequency range Low Band (850-900Mhz) low-frequency filter 30 and antenna 130 under the control of frequency antenna match control signal
Matching；Low-frequency filter 30, for being filtered under the control of low-frequency filter control signal to radiofrequency signal to allow low frequency
Section Low Band (850-900Mhz) radiofrequency signals are by preventing other frequency range radiofrequency signals from passing through；Low frequency receives and dispatches match circuit
40 are made up of variable capacitance and variable inductance, for low frequency transmitting-receiving match control signal control under by low-frequency filter 30 with
Transceiver 110 matches；Intermediate frequency antenna-matching circuit 50 is made up of variable capacitance and variable inductance, in intermediate frequency antenna match control
Mid Frequency Middle Band (1800-2000Mhz) intermediate-frequency filter 60 is matched with antenna 130 under the control of signal processed；In
Frequency wave filter 60, for being filtered under the control of intermediate-frequency filter control signal to radiofrequency signal to allow Mid Frequency Middle
Band (1800-2000Mhz) radiofrequency signals are by preventing other frequency range radiofrequency signals from passing through；Medium-frequency receiving and sending match circuit 70 by
Variable capacitance and variable inductance composition, under the control of medium-frequency receiving and sending match control signal by intermediate-frequency filter 60 with transmitting-receiving
Device 110 matches；High frequency antenna match circuit 80 is made up of variable capacitance and variable inductance, for believing in high frequency antenna match control
Number control under high band High Band (being more than 2000Mhz) high frequency filter 90 is matched with antenna 130；High frequency filter
Device 90, for being filtered under the control of medium-high frequency filter control signal to radiofrequency signal to allow high band High Band
(being more than 2000Mhz) radiofrequency signal is by preventing other frequency range radiofrequency signals from passing through；High frequency receives and dispatches match circuit 100 by variable
Electric capacity and variable inductance composition, by high frequency filter 90 and transceiver under the control for receiving and dispatching match control signal in high frequency
110 matchings；Transceiver 110, the radiofrequency signal treated by different frequency range path for antenna to be received are demodulated,
It is then fed into CPU to be further processed, while frequency range is sent to control signal generator 120 according to the broadcast singal of cell
Selection signal；Control signal generator 120, for receiving the Frequency Band Selection signal behavior corresponding band from transceiver 110 simultaneously
Export corresponding antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal；
Antenna 130, for the electromagnetic wave in reception space and electric signal is translated into, facilitates follow-up radio circuit (antenna match electricity
Road, wave filter, transmitting-receiving match circuit and transceiver) handled, the resonance range of the antenna should cover the institute of their location
There is frequency range (Band).
Specifically, antenna 130 is connected to the common port of duplexer 10, and the 3 tunnels output of duplexer 10 is respectively connecting to
Low-frequency antenna match circuit 20, intermediate frequency antenna-matching circuit 50, the input of high frequency antenna match circuit 80, from control signal
The antenna switch control signal of generator 120 is connected to the control terminal of duplexer 10；
Low-frequency antenna match circuit 20, intermediate frequency antenna-matching circuit 50, the output end difference of high frequency antenna match circuit 80
Low-frequency filter 30, intermediate-frequency filter 60, the input of high frequency filter 90 are connected to, from control signal generator 120
Low frequency/intermediate frequency/high frequency antenna match control signal is respectively connecting to low-frequency antenna match circuit 20, intermediate frequency antenna-matching circuit
50th, the control terminal of high frequency antenna match circuit 80；
Low-frequency filter 30, intermediate-frequency filter 60, the output end of high frequency filter 90 are respectively connecting to low frequency transmitting-receiving matching
Circuit 40, medium-frequency receiving and sending match circuit 70, the input of high frequency transmitting-receiving match circuit 100, from control signal generator 120
Low frequency/intermediate frequency/high frequency filter control signal is respectively connecting to low-frequency filter 30, intermediate-frequency filter 60, high frequency filter 90
Control terminal,
Low frequency transmitting-receiving match circuit 40, medium-frequency receiving and sending match circuit 70, the output end difference of high frequency transmitting-receiving match circuit 100
The corresponding port of transceiver 110 is connected to, low frequency/intermediate frequency from control signal generator 120/high frequency transmitting-receiving match control letter
Number it is respectively connecting to the control of low frequency transmitting-receiving match circuit 40, medium-frequency receiving and sending match circuit 70, high frequency transmitting-receiving match circuit 100
End；
The output of transceiver 110 is connected to the processor CPU of system, the Frequency Band Selection signal connection that transceiver 110 exports
To the input of control signal generator 120, the antenna switch control signal that control signal generator 120 exports is connected to antenna
The control terminal of switch 10, low frequency/intermediate frequency/high frequency antenna match control signal that control signal generator 120 exports connect respectively
Tremendously low frequency antenna-matching circuit 20, intermediate frequency antenna-matching circuit 50, the control terminal of high frequency antenna match circuit 80, control signal hair
Low frequency/intermediate frequency/high frequency filter control signal that raw device 120 exports be respectively connecting to low-frequency filter 30, intermediate-frequency filter 60,
The control terminal of high frequency filter 90, low frequency/intermediate frequency that control signal generator 120 exports/high frequency transmitting-receiving match control signal point
Lian Jie not tremendously low frequency transmitting-receiving match circuit 40, medium-frequency receiving and sending match circuit 70, the control terminal of high frequency transmitting-receiving match circuit 100.
The present invention is further illustrated by a specific embodiment below in conjunction with Fig. 4：
Before cell and terminal do not set up communication, control signal generator control tunable filter and match circuit, make its work
Make in the broadcast channel of cell, receive the broadcast message from cell；Cell will establish the industry for the needs that communicate by broadcast channel
Business channel information informs terminal, and transceiver sends signal, control signal according to obtained channel information to control signal generator
Generator sends control signal (including antenna match control signal, filter control signal, transmitting-receiving match control signal), changes
The variable element of tunable filter and match circuit (including antenna-matching circuit and transmitting-receiving match circuit), working in it will
The Traffic Channel of communication is established, while changes the state of duplexer by antenna switch control signal, frequency band corresponding to connection,
After sign off, control signal generator sends control signal, tunable filter and match circuit is worked in cell again
Broadcast channel, the broadcast message from cell is received, prepare the foundation of communication next time.
In another embodiment of the present invention, as shown in figure 5, a kind of realization side of radio-frequency front-end receiving circuit of the present invention
Method, comprise the following steps：
Step 501, control signal generator according to the Frequency Band Selection signal behavior corresponding band from transceiver and exports
Corresponding antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal.
Step 502, duplexer determines corresponding path, antenna match electricity under antenna switch control signal control
Road, tunable resonator and transmitting-receiving match circuit are respectively in the antenna match control signal, filter control signal, receipts
Send out and determine corresponding match circuit and tunable filter under the control of match control signal and carry out running parameter adjustment.
Specifically, if the selection that transceiver output Frequency Band Selection signal is low-frequency range Low Band (850-900Mhz) is believed
Number, then control signal generator output low frequency antenna match signal, low-frequency filter control signal, low frequency transmitting-receiving match control are believed
Number and control low-frequency range path antenna switch control signal, duplexer antenna switch control signal control under determine it is low
The path of frequency range, antenna-matching circuit, tunable resonator and transmitting-receiving match circuit are respectively in low-frequency antenna match control
Signal, low-frequency filter control signal, low frequency transmitting-receiving match control signal control under determination low-frequency antenna match circuit, low frequency
Wave filter and low frequency transmitting-receiving match circuit simultaneously carry out running parameter adjustment, due to the situation of Mid Frequency and high band with it is such
Seemingly, will not be described here.
In summary, a kind of radio-frequency front-end receiving circuit of the present invention and its implementation be by designing three physical channels,
Using tunable filter and adjustable match circuit, by changing its parameter, it is worked in different channels, can be achieved to institute
Have the support of frequency band, realize it is a kind of can with the radio-frequency front-end receiving circuit of flexible configuration, its can reduce receiving circuit occupancy
Pcb board area, while improve the flexibility of design.The present invention can need to change according to user, in reception signal frequency
When rate is higher, frequency range is wider, it can continue to increase RX path, the present invention is applicable not only to mobile communication terminal, also can use
In other multimode multi-frequency receiving circuits.
Compared with prior art, the invention has the advantages that：
1st, the present invention uses tunable filter and adjustable match circuit, and by adjusting variable element, to work in it different
Frequency band, realize the flexible configuration of radio-frequency front-end receiving circuit.
2nd, radio-frequency front-end receiving circuit path of the invention reduce, it is necessary to component accordingly reduce, saved cost, and
Save larger PCB surface product.
It should be noted that above-described embodiment can independent assortment as needed.Described above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of radio-frequency front-end receiving circuit, including：
Antenna, for the electromagnetic wave in reception space and electric signal is translated into, so that follow-up radio circuit is handled；
Duplexer, different frequency model is realized under the control for the antenna switch control signal exported in control signal generator
The path switching enclosed, the antenna is connected to the path of multiple different frequency scopes；
Tunable resonator, the filter control signal for being exported according to control signal generator determine tunable filter simultaneously
Its variable element is adjusted, tunable filter is operated in different frequency bands；
Antenna-matching circuit, the antenna match control signal for being exported according to control signal generator determine match circuit and adjusted
Full employment frequency, realize the impedance matching between the duplexer and tunable resonator；
Match circuit is received and dispatched, the transmitting-receiving match control signal for being exported according to control signal generator determines match circuit and adjusted
Full employment frequency, realize the impedance matching between the tunable resonator and transceiver；
Transceiver, the radiofrequency signal treated by different frequency range path for the antenna to be received are demodulated, and
According to the actual requirements Frequency Band Selection signal is sent to control signal generator；
Control signal generator, for the Frequency Band Selection signal behavior corresponding band according to the transceiver and export corresponding day
Lines matching control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal.
A kind of 2. radio-frequency front-end receiving circuit as claimed in claim 1, it is characterised in that：The multiple different frequency scope
Path includes three low-frequency range, Mid Frequency, high band physical channels.
A kind of 3. radio-frequency front-end receiving circuit as claimed in claim 2, it is characterised in that the tunable resonator bag
Include：
Low-frequency filter, for when the filter control signal is low-frequency filter control signal, in the low frequency filtering
Device control signal control lower adjustment variable element, radiofrequency signal is filtered to allow low-frequency range radiofrequency signal by preventing it
He passes through frequency range radiofrequency signal；
Intermediate-frequency filter, for when the filter control signal is intermediate-frequency filter control signal, in the intermediate frequency filtering
Device control signal control lower adjustment variable element, radiofrequency signal is filtered to allow Mid Frequency radiofrequency signal by preventing it
He passes through frequency range radiofrequency signal；
High frequency filter, for when the filter control signal is high frequency filter control signal, in the High frequency filter
Device control signal control lower adjustment variable element, radiofrequency signal is filtered to allow high band radiofrequency signal by preventing it
He passes through frequency range radiofrequency signal.
4. a kind of radio-frequency front-end receiving circuit as claimed in claim 3, it is characterised in that the antenna-matching circuit includes：
Low-frequency antenna match circuit, for when the antenna match control signal is low-frequency antenna match control signal, in institute
State the control of low-frequency antenna match control signal and lower full employment parameter, by the low-frequency filter of low-frequency range and the duplexer
Match somebody with somebody；
Intermediate frequency antenna-matching circuit, for when the antenna match control signal is intermediate frequency antenna match control signal, in institute
State the control of intermediate frequency antenna match control signal and lower full employment parameter, by the intermediate-frequency filter of Mid Frequency and the duplexer
Match somebody with somebody；
High frequency antenna match circuit, for when the antenna match control signal is high frequency antenna match control signal, in institute
State the control of high frequency antenna match control signal and lower full employment parameter, by the high frequency filter of high band and the duplexer
Match somebody with somebody.
5. a kind of radio-frequency front-end receiving circuit as claimed in claim 3, it is characterised in that the transmitting-receiving match circuit includes：
Low frequency receives and dispatches match circuit, for when the transmitting-receiving match control signal is that low frequency receives and dispatches match control signal, in institute
State low frequency transmitting-receiving match control signal control and lower full employment parameter, by the low-frequency filter of low-frequency range and the transceiver
Match somebody with somebody；
Medium-frequency receiving and sending match circuit, in it is described transmitting-receiving match control signal be medium-frequency receiving and sending match control signal when, in institute
State the control of medium-frequency receiving and sending match control signal and lower full employment parameter, by the intermediate-frequency filter of Mid Frequency and the transceiver
Match somebody with somebody；
High frequency receives and dispatches match circuit, for when the transmitting-receiving match control signal is that high frequency receives and dispatches match control signal, in institute
State high frequency transmitting-receiving match control signal control and lower full employment parameter, by the high frequency filter of high band and the transceiver
Match somebody with somebody.
A kind of 6. radio-frequency front-end receiving circuit as described in claim 4 or 5, it is characterised in that：The match circuit include by
The variable capacitance and variable inductance of the control signal control of the control signal generator output.
7. a kind of implementation method of radio-frequency front-end receiving circuit, comprises the following steps：
Step 1, control signal generator is according to the Frequency Band Selection signal behavior corresponding band from transceiver and exports corresponding
Antenna match control signal, filter control signal, transmitting-receiving match control signal and antenna switch control signal；
Step 2, duplexer determine corresponding path under antenna switch control signal control, antenna-matching circuit, can
Tunable filter circuit and transmitting-receiving match circuit are respectively in the antenna match control signal, filter control signal, transmitting-receiving
Corresponding match circuit and tunable filter are determined under control with control signal and carries out corresponding running parameter adjustment.
A kind of 8. implementation method of radio-frequency front-end receiving circuit as claimed in claim 7, it is characterised in that：If the transceiver
Export the selection signal that Frequency Band Selection signal is low-frequency range, then the control signal generator output low frequency antenna match signal,
Low-frequency filter control signal, low frequency transmitting-receiving match control signal and the antenna switch control signal for controlling low-frequency range path,
The duplexer determines the path of low-frequency range, the antenna-matching circuit, can under antenna switch control signal control
Tunable filter circuit and transmitting-receiving match circuit are respectively in the low-frequency antenna match control signal, low-frequency filter control letter
Number, low frequency transmitting-receiving match control signal control under determination low-frequency antenna match circuit, low-frequency filter and low frequency transmitting-receiving
With circuit and carry out corresponding running parameter adjustment.
A kind of 9. implementation method of radio-frequency front-end receiving circuit as claimed in claim 7, it is characterised in that：If the transceiver
Export the selection signal that Frequency Band Selection signal is Mid Frequency, then the control signal generator output intermediate frequency antenna match signal,
Intermediate-frequency filter control signal, medium-frequency receiving and sending match control signal and the antenna switch control signal for controlling Mid Frequency path,
The duplexer determines the path of Mid Frequency, the antenna-matching circuit, can under antenna switch control signal control
Tunable filter circuit and transmitting-receiving match circuit are respectively in the intermediate frequency antenna match control signal, intermediate-frequency filter control letter
Number, determine intermediate frequency antenna-matching circuit, intermediate-frequency filter and medium-frequency receiving and sending under the control of medium-frequency receiving and sending match control signal
With circuit and carry out corresponding running parameter adjustment.
A kind of 10. implementation method of radio-frequency front-end receiving circuit as claimed in claim 7, it is characterised in that：If the transmitting-receiving
Device output Frequency Band Selection signal is the selection signal of high band, then the control signal generator output high frequency antenna matching letter
Number, high frequency filter control signal, high frequency transmitting-receiving match control signal and control high band path duplexer control letter
Number, the path of duplexer determination high band under antenna switch control signal control, the antenna-matching circuit,
Tunable resonator and transmitting-receiving match circuit are respectively in the high frequency antenna match control signal, high frequency filter control letter
Number, high frequency transmitting-receiving match control signal control under determination high frequency antenna match circuit, high frequency filter and high frequency transmitting-receiving
With circuit and carry out corresponding running parameter adjustment.
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| CN201710819347.2A CN107612568A (en) | 2017-09-12 | 2017-09-12 | A kind of radio-frequency front-end receiving circuit and its implementation |
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| CN201710819347.2A CN107612568A (en) | 2017-09-12 | 2017-09-12 | A kind of radio-frequency front-end receiving circuit and its implementation |
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|---|---|---|---|
| CN201710819347.2A Pending CN107612568A (en) | 2017-09-12 | 2017-09-12 | A kind of radio-frequency front-end receiving circuit and its implementation |
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| CN108595995A (en) * | 2018-05-02 | 2018-09-28 | 北京紫光微电子系统有限公司 | A kind of detection antenna system and detection method for intermediate frequency radio-frequency identification card |
| CN109150206A (en) * | 2018-09-14 | 2019-01-04 | 深圳传音通讯有限公司 | Antenna-matching circuit, terminal device and impedance matching methods |
| CN109728835A (en) * | 2019-02-19 | 2019-05-07 | 深圳市和盈互联科技有限公司 | A kind of circuit device of multiband transmitting-receiving high-isolation |
| WO2020015552A1 (en) * | 2018-07-16 | 2020-01-23 | 中兴通讯股份有限公司 | Antenna receiving circuit, method, mobile terminal, and storage medium |
| CN111130588A (en) * | 2019-12-31 | 2020-05-08 | 西安易朴通讯技术有限公司 | Communication transceiving front-end system, device and control method |
| CN112422144A (en) * | 2020-10-30 | 2021-02-26 | 锐石创芯（深圳）科技有限公司 | Radio frequency front-end device and wireless device |
| CN113114280A (en) * | 2021-04-15 | 2021-07-13 | 维沃移动通信有限公司 | Radio frequency circuit, electronic equipment and radio frequency circuit control method |
| CN113131962A (en) * | 2019-12-31 | 2021-07-16 | 宜确半导体（苏州）有限公司 | Radio frequency circuit for carrier aggregation, control method thereof and terminal equipment |
| CN113765527A (en) * | 2021-07-23 | 2021-12-07 | 上海闻泰信息技术有限公司 | Frequency divider and control method thereof |
| CN114204944A (en) * | 2020-09-02 | 2022-03-18 | Oppo（重庆）智能科技有限公司 | Signal receiving and transmitting device and terminal |
| CN115412121A (en) * | 2022-08-24 | 2022-11-29 | 立讯精密工业（昆山）有限公司 | Intelligent antenna device and control method thereof |
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| CN108595995A (en) * | 2018-05-02 | 2018-09-28 | 北京紫光微电子系统有限公司 | A kind of detection antenna system and detection method for intermediate frequency radio-frequency identification card |
| WO2020015552A1 (en) * | 2018-07-16 | 2020-01-23 | 中兴通讯股份有限公司 | Antenna receiving circuit, method, mobile terminal, and storage medium |
| CN109150206A (en) * | 2018-09-14 | 2019-01-04 | 深圳传音通讯有限公司 | Antenna-matching circuit, terminal device and impedance matching methods |
| CN109728835A (en) * | 2019-02-19 | 2019-05-07 | 深圳市和盈互联科技有限公司 | A kind of circuit device of multiband transmitting-receiving high-isolation |
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| CN113131962A (en) * | 2019-12-31 | 2021-07-16 | 宜确半导体（苏州）有限公司 | Radio frequency circuit for carrier aggregation, control method thereof and terminal equipment |
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| CN112422144A (en) * | 2020-10-30 | 2021-02-26 | 锐石创芯（深圳）科技有限公司 | Radio frequency front-end device and wireless device |
| CN113114280A (en) * | 2021-04-15 | 2021-07-13 | 维沃移动通信有限公司 | Radio frequency circuit, electronic equipment and radio frequency circuit control method |
| CN113765527A (en) * | 2021-07-23 | 2021-12-07 | 上海闻泰信息技术有限公司 | Frequency divider and control method thereof |
| CN115412121A (en) * | 2022-08-24 | 2022-11-29 | 立讯精密工业（昆山）有限公司 | Intelligent antenna device and control method thereof |
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Application publication date: 20180119 |