CN106559100A - A kind of communication RF front-end module and communication means - Google Patents
A kind of communication RF front-end module and communication means Download PDFInfo
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- CN106559100A CN106559100A CN201510628224.1A CN201510628224A CN106559100A CN 106559100 A CN106559100 A CN 106559100A CN 201510628224 A CN201510628224 A CN 201510628224A CN 106559100 A CN106559100 A CN 106559100A
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Abstract
The present invention provides a kind of communication RF front-end module and communication means, including：The duplexer of switching transmission link；Isolation input, output signal, support the duplexer of multi-band signal transmission；The output signal of transmitter is transferred to into the power amplifier of duplexer；Input signal is transferred to into the low-noise amplifier of receiver.By adjusting impedance balance network, communication RF front-end module is arranged into corresponding frequency range；The signal of corresponding band is received by antenna, and low-noise amplifier is transferred to by way of duplexer is with difference mode signal；Transmitter sends signal, is input to duplexer and exports antenna Jing after power amplifier amplifies, meanwhile, output signal is transferred to low-noise amplifier in the way of common-mode signal by duplexer, and common-mode signal is eliminated by low-noise amplifier, plays buffer action.The present invention effectively can simplify number of devices needed for radio-frequency front-end, support multiple communications bands, noise coefficient is little, meet the demand of practical application.
Description
Technical field
The present invention relates to field of mobile communication, more particularly to a kind of communication RF front-end module and communication means.
Background technology
Used in FDD (Frequency Division Duplexing, also referred to as FDD, full duplex) is mobile communication system
One kind of full-duplex communication technology, it is corresponding with TDD (Time Division Duplexing, time division duplex).FDD up-downgoings
Simultaneous Transmission of Data, needs two independent channels during operation.One channel is used for transmission information downwards, and one other channel is used for
It is passed up information.There is a protection frequency range between two channels, to prevent from phase being produced between neighbouring transmitter and receiver
Mutually disturb.The system worked using fdd mode is the system of continuous control, is adapted to the country of great Qu and international covering
Roaming, is suitable for symmetrical service, such as speech, interactive real time data etc..
In order to suppress impact of the external interference signal to terminal received signals sensitivity, while suppressing the band of transmitting path radiofrequency signal
Outer interference, it usually needs configure duplexer to solve radio-frequency front-end reception between the reception of FDD system radio-frequency front-end and transmitting chain
The isolating problem of passage and transmission channel.In general, the duplexer for radio-frequency front-end is generally made up of two wave filter.Cause
This, filtering device quantity is increased and linear increment with radio-frequency front-end adaptation number of frequency bands.After LTE multibands are introduced, frequency
The increase of segment number directly affects the increase of radio frequency front-end filter part, power amplifier and number of switches and complexity.According to current
Commercial solution, the wave filter/duplexer of terminal, power amplifier and switch are essentially all each independent device, along with periphery
Match circuit be assembled in circuit board terminal, this can undoubtedly have a strong impact on the integrated level of whole Terminal Design, and then cause terminal
Face a severe challenge at aspects such as cost, volume, the market competitivenesss.We are completed in the urgent need to there is more ingenious method
RF front-end module on single IC for both chip, rather than the application demand for stacking to tackle multimode multi-frequency with the quantity of device.
Typical FDD system structure of radio-frequency front end is as shown in figure 1, including the 200, first～the 4th duplexer of duplexer
The 221～224, first～the 4th power amplifier 231～234 of 211～214, first～the 4th low-noise amplifier, and radio circuit
240；200 one end of the duplexer connects antenna 1, and the other end selects the different links shown in 201,202,203,204
Connection；Transmitting chain and receives link are isolated by described first～the 4th duplexer 211～214；From the radio circuit 240
Modulated signal the first～the 4th power amplifier 231～234 described in Jing is transmitted to the described first～the 4th duplexer 211～214 respectively
And reach the antenna 1.First～the 4th duplexer 211～214 described in the signal Jing that the antenna 1 is received and described first～
4th low-noise amplifier 221～224 is transmitted separately to the radio circuit 240.
Foregoing diplexer is constituted by the wave filter of two different frequency ranges, realizes receiving and launching carrying out simultaneously by wave filter frequency-selecting,
And make its signal path mutually isolated.And the duplexer based on wave filter is when the mode of operation of multiband is tackled, one typical
Thinking is to increase the quantity of wave filter and realizes the support to multiple working frequency range.As it was previously stated, such thinking and structure, inevitable
So that the number of devices of radio-frequency front-end is presented uncontrollable growth trend.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of communication RF front-end module and communication party
Method, for solving, communication RF front-end number of devices in prior art is more, complex structure and other problems.
For achieving the above object and other related purposes, the present invention provides a kind of communication RF front-end module, before the communication radio frequency
End module at least includes：
Duplexer, duplexer, power amplifier and low-noise amplifier；
Wherein, the duplexer is connected with antenna, for switching transmission link；
The duplexer is connected with the duplexer, the power amplifier and the low-noise amplifier, for described
The signal of power amplifier and low-noise amplifier transmission is isolated, while supporting the transmission of multi-band signal；
The input of the power amplifier is connected to transmitter, outfan and is connected to the duplexer, for receiving the transmitting
The signal that machine is sended over, and after carrying out processing and amplifying, it is transferred to the duplexer；
The input of the low-noise amplifier is connected to the duplexer, outfan and is connected to receiver, described double for receiving
The signal that work device is sended over, and after carrying out processing and amplifying, it is transferred to the receiver.
Preferably, the duplexer includes mixing autotransformer and impedance balance network, by the mixing autotransformer
The power amplifier is realized to the low-loss transmission of the antenna, and the antenna is to the low-loss of the low-noise amplifier
Transmission；By support of the communication RF front-end module to multiple working frequency range described in the impedance balance real-time performance.
It is highly preferred that the mixing autotransformer includes first order coil and second level coil, wherein, the first order coil
First end and the duplexer be connected, centre tap be connected the power amplifier, the second end connection impedance balance net
Network；The second level coil connects the input of the low-noise amplifier.
It is highly preferred that the impedance balance network includes the capacitor array and electric resistance array of parallel connection, can be by external signal to described
Capacitor array and the electric resistance array are adjusted, and then realize the control to impedance.
Preferably, the low-noise amplifier is differential configuration low-noise amplifier.
Preferably, also it is connected with the antenna including one end, the tunable capacitor of other end ground connection, for the impedance of antenna port
Match somebody with somebody.
Preferably, the duplexer is integrated unit on piece.
For achieving the above object and other related purposes, the present invention provides a kind of communication means of communication RF front-end, the communication
The communication means of radio-frequency front-end at least includes：
Impedance balance network is adjusted, communication RF front-end module is arranged into corresponding frequency range；
The signal of corresponding band is received by antenna, and is sent to the first order coil of duplexer, the first order coil is by signal
It is coupled to second level coil and low-noise amplifier is transferred in the way of difference mode signal, subsequently into receiver；
Transmitter sends signal, is input to the first order coil of the duplexer, and exports described Jing after power amplifier amplifies
Antenna, meanwhile, the first order coil is coupled a signal to second level coil and the low noise is transferred in the way of common-mode signal
The common-mode signal is eliminated by acoustic amplifier, the low-noise amplifier, reaches signal between the transmitter and the receiver
Isolation.
Preferably, adjust the impedance balance network so as to meet following relational expression：Wherein, RANTFor day
The impedance of line end mouth, RBALFor the impedance of the impedance balance network, N1For the first order coil be located at the antenna with it is described
Coil turn between transmitter, N2The line between the impedance balance network and the transmitter is located at for the first order coil
The circle number of turn.
As described above, the communication RF front-end module and communication means of the present invention, have the advantages that：
1st, the RF front-end circuit framework of present invention design can effectively simplify the number of devices needed for radio-frequency front-end.
2nd, a kind of multiband aerial duplexer based on auto-transformer configuration on piece of present invention design.The duplexer can pass through phase
Support of the powered-down road control realization to multiple communications bands, without increasing number of devices.
3rd, bridge balance network of the present invention using a kind of advanced configuration.The network is made up of electric capacity and electric resistance array.Can pass through
External signal controls its impedance variation, so as to realize the impedance balance to whole duplexer, and then realizes to multiple working frequency range
Support.
4th, effective reduction that the present invention receives chain noise factor by achieving a butt joint using LNA on a kind of piece of differential configuration.
5th, using a kind of power amplifier for being capable of multimode multi-frequency work, the quantity that can not increase power amplifier is i.e. real for the present invention
The now support to multiple communications bands.
6th, using the transformator of multi-pole coils composition as the core texture of duplexer, the present invention can support that transmitting chain power is put
The power output of big more than device 27dBm, meets the demand of practical application.
Description of the drawings
Fig. 1 is shown as FDD system structure of radio-frequency front end schematic diagram of the prior art.
Fig. 2 is shown as the communication RF front-end module principle schematic diagram of the present invention.
Fig. 3 is shown as the communication RF front-end module particular circuit configurations schematic diagram of the present invention.
Fig. 4 is shown as the schematic diagram of the duplexer of single-stage coil composition.
Fig. 5 is shown as the equivalent circuit diagram of the duplexer of single-stage coil composition.
Component label instructions
1 antenna
200 duplexers
211～214 the first～the 4th duplexers
221～224 the first～the 4th low-noise amplifiers
231～234 the first～the 4th power amplifiers
240 radio circuits
3 communication RF front-end modules
300 duplexers
310 duplexers
311 mixing autotransformer
312 impedance balance networks
320 power amplifiers
330 low-noise amplifiers
S1～S3 steps one～step 3
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by disclosed by this specification
Content understand easily the present invention other advantages and effect.The present invention can also be added by specific embodiments different in addition
To implement or apply, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Various modifications and changes are carried out under god.
Refer to Fig. 2～Fig. 5.It should be noted that the diagram provided in the present embodiment only illustrates the present invention's in a schematic way
Basic conception, only show in schema then with relevant component in the present invention rather than according to component count during actual enforcement, shape and
Size is drawn, and which is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout type
State is likely to increasingly complex.
In order to tackle the radio frequency applications demand of multimode multi-frequency section, the mentality of designing of conventional diplexer necessarily brings radio frequency front-end devices number
That what is measured increases rapidly.Communication RF front-end number of devices in prior art is more, baroque problem in order to solve for the present invention, carries
Go out a kind of communication RF front-end module, as shown in Fig. 2 the communication RF front-end module 3 includes：
Duplexer 300, duplexer 310, power amplifier 320 and low-noise amplifier 330.
Specifically, the duplexer 300 is connected with antenna 1, for switching transmission link.As shown in Figure 2 to 3, it is described
Duplexer 300 is a single pole multiple throw, and in the present embodiment, the duplexer 300 includes that one is fixedly connected with knife
Port and four optional ports, the duplexer 300 is connected the antenna 1 with the port that knife is fixedly connected, and four can
Select port to connect different transmission links respectively, including the present invention in the duplexer 310, the power amplifier 320
And the signal transmission of the link of the composition of low-noise amplifier 330, the achievable LTE of the link and successive bands, realize
The signal transmission of whole frequency ranges of GSM to LTE also needs to connect other links, does not repeat one by one in the present embodiment.
Specifically, tunable capacitor C1, the tunable capacitor C1 are also associated between the antenna 1 and the duplexer 300
One end be connected between the antenna 1 and the duplexer 300, other end ground connection can be with by the control of external signal
The capacitance of the tunable capacitor C1 is adjusted, for the impedance matching of antenna port.
Specifically, the duplexer 310 is put with the duplexer 300, the power amplifier 320 and the low noise
Big device 330 is connected, for isolating to the signal of the power amplifier 320 and the transmission of the low-noise amplifier 330,
Mobile terminal antenna duplexer can be met for the requirement of isolation, loss and insertion loss.Meanwhile, support multiband
The transmission of signal, in the present embodiment, the duplexer 310 is worked in the RF front-end circuit of FDD-LTE systems, work
Working frequency scope 2300MHz～2400MHz, the signal transmission being capable of achieving in 2300MHz～2400MHz frequency ranges.It is described double
Work device 310 is integrated unit on piece.
More specifically, as shown in figure 3, the duplexer 310 includes mixing autotransformer 311 and impedance balance network 312,
Realize the power amplifier 320 to the low-loss transmission of the antenna 1, Yi Jisuo by the mixing autotransformer 311
Antenna 1 is stated to the low-loss transmission of the low-noise amplifier 330；The communication is realized by the impedance balance network 312
Support of the RF front-end module 1 to multiple working frequency range.
As shown in figure 3, wherein, the mixing autotransformer 311 includes first order coil L1 and second level coil L2；Institute
The first end for stating first order coil L1 connects the duplexer 300, and the centre tap connection of the first order coil L1 is described
The outfan of power amplifier 320, second end of the first order coil L1 connect the impedance balance network 312；Described
Secondary coil L2 connects the input of the low-noise amplifier 330.
As shown in figure 3, the impedance balance network 312 includes the capacitor array C3 and electric resistance array R3 of parallel connection, can be by outer
Portion's signal is adjusted to the capacitor array C3 and the electric resistance array R3, and then realizes the control to impedance.
The duplexer 310 of the present invention can both play buffer action using the mixing autotransformer 311 of two-stage loop construction,
The low-noise amplifier 330 can be protected again.
The duplexer of single-stage coil composition is illustrated in figure 4, only including one-level coil, the two ends of coil similarly connect institute respectively
Antenna 1 and the impedance balance network 312 are stated, centre tap connects the power amplifier 320, the low-noise amplifier
330 two ends for being connected to coil, its equivalent circuit are as shown in Figure 5.Substitutional resistance R4 and R5 are connected to ANT and BAL ends
Between mouthful, the output resistance Rout for being attached to RX ports is connected between ANT and BAL ports, is attached to TX ports
Resistance R6 is connected at the centre tap of coil, and excitation can be by one or more controlled voltage source Vc with resistance branch series connection
There is provided.When multiple excitations are controlled by, the response of this linear circuit is the superposition of respective response.So through simple derivation,
Power transmission from TX to ANT is characterized as power gain (ζ tr):
Wherein the coil turn at ANT ends is N1, and the number of turn at BAL ends is N2.When transmitter is by single-stage coil and day knot
Close, and during because of resistance R5 wasted powers, its power gain ζ tr ＜ 1.As TX and ANT ports are matched respectively,
Formula (1) also illustrates that the actual gain ζ avl between two ports.In order to make actual gain value level off to 1 as far as possible, order is needed
N2/N1→∞。
The similar antenna that can obtain to the available power gain of receiver is：
Its inverse gives the noise coefficient of ANT to RX：
For efficient transmission signal, the actual gain of TX to ANT should reach its maximum 1, this need one it is big
Turn ratio N2/N1.But formula (3) shows that the noise coefficient of RX ports can rise together with this ratio, it will cause to deteriorate
Receptivity.The output port that receipts machine can be docked in coil adds low-noise amplifier 330 to control noise coefficient, but
The output of existing 3G/4G communication protocol requirements transmitter is more than 25dBm, and a peak value is 3.2dB's to average ratio
Modulation voltage will make the voltage on antenna have the amplitude of oscillation of 15V peak-to-peak values, and this amplitude of oscillation will be added to via the coil of duplexer
The input of receiver, this has the device that may greatly puncture in the low-noise amplifier 330.The mixing self coupling of the present invention becomes
Depressor 311 is identical with the expression formula of the power gain of the duplexer that single-stage coil is constituted, noise coefficient, therefore can realize efficiently
Signal transmission, simultaneously as the mixing autotransformer 311 of the present invention be two-stage coil, it is possible to resolve 15V in single-stage coil
The amplitude of oscillation of peak-to-peak value punctures to the low-noise amplifier 330.
Specifically, the input of the power amplifier 320 is connected to the signal output part TX of transmitter, outfan and is connected to institute
The centre tap of first order coil L1 in duplexer 310 is stated, for receiving the signal that the transmitter is sended over, and is put
The duplexer 310 is transferred to after big process, further to send signal by the antenna 1.
Specifically, the input of the low-noise amplifier 330 is connected to the second level coil L2 of the duplexer 310, output
End is connected to the signal input part RX of receiver, for receiving the signal that the duplexer 310 is sended over, and is amplified place
The receiver is transferred to after reason.
More specifically, the low-noise amplifier 330 is differential configuration low-noise amplifier.As shown in figure 3, the low noise
Amplifier 330 include the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4,
First resistor R1 and second resistance R2；Wherein, the source of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2
End is connected and is grounded, and grid end is respectively connecting to the two ends of the second level coil L2, constitutes differential pair；First metal-oxide-semiconductor
M1 is connected the 3rd metal-oxide-semiconductor M3's and the 4th metal-oxide-semiconductor M4 respectively with the drain terminal of the second metal-oxide-semiconductor M2
Source；The grid end of the 3rd metal-oxide-semiconductor M3 and the 4th metal-oxide-semiconductor M4 connects voltage V1 and V2 respectively, and described
The drain terminal of three metal-oxide-semiconductor M3 and the 4th metal-oxide-semiconductor M4 connects first resistor R1 and second resistance R2 respectively,
The other end of first resistor R1 is connected with the other end of second resistance R2 and is connected power supply, the 3rd metal-oxide-semiconductor
The drain terminal of M3 and the 4th metal-oxide-semiconductor M4 is respectively as positive output end Vout+ and reversed-phase output Vout-.
Specifically, the input of the low-noise amplifier 330 is also parallel with tunable capacitor C2.
As shown in Figure 2 to 3, the operation principle of above-mentioned communication RF front-end module 3 is as follows：
Step S1：The impedance balance network 312 is adjusted, communication RF front-end module 3 is arranged into corresponding frequency range.
Specifically, the impedance of the communication RF front-end module 3 reaches balance and need to meet following relational expression：
Wherein, RANTFor the impedance of antenna port, RBALFor the impedance of the impedance balance network 312, N1For the first order
Coil L1 is located at the coil turn between the antenna 1 and the transmitter, N2The resistance is located at for the first order coil L1
Coil turn between anti-balance network 312 and the transmitter, i.e., the centre tap both sides coil turn of described first order coil L1
Number.RANTAnd RBALRepresentative impedance is an amount relevant with frequency in itself, for different communication frequencys, same electricity
It is different to hold inductance network (GC networks) its impedance.In given working frequency range, the impedance balance network 312 is adjusted, is made
Its port Impedance meets above formula；When working frequency range changes, the resistance value of the impedance balance network 312 need to readjust with
Meet above formula.
Step S2：The signal of corresponding band is received by antenna 1, and is sent to the first order coil L1 of duplexer 310, institute
State first order coil L1 to couple a signal to second level coil L2 and low-noise amplifier is transferred in the way of difference mode signal, after
And enter receiver.
Step S3：Transmitter sends signal, and the first order line of the duplexer 310 is input to Jing after power amplifier 320 amplifies
Circle L1, and export the antenna 1；Meanwhile, the first order coil L1 couples a signal to second level coil L2 and with altogether
The mode of mould signal is transferred to the low-noise amplifier 330, and the common-mode signal is eliminated by the low-noise amplifier 330,
Reach the isolation of signal between the transmitter and the receiver.
The communication RF front-end module and communication means of the present invention, has the advantages that：
1st, the RF front-end circuit framework of present invention design can effectively simplify the number of devices needed for radio-frequency front-end.
2nd, a kind of multiband aerial duplexer based on auto-transformer configuration on piece of present invention design.The duplexer can pass through phase
Support of the powered-down road control realization to multiple communications bands, without increasing number of devices.
3rd, bridge balance network of the present invention using a kind of advanced configuration.The network is made up of electric capacity and electric resistance array.Can pass through
External signal controls its impedance variation, so as to realize the impedance balance to whole duplexer, and then realizes to multiple working frequency range
Support.
4th, the present invention receives effectively subtracting for chain noise factor by achieving a butt joint using low-noise amplifier on a kind of piece of differential configuration
It is few.
5th, using a kind of power amplifier for being capable of multimode multi-frequency work, the quantity that can not increase power amplifier is i.e. real for the present invention
The now support to multiple communications bands.
6th, using the transformator of multi-pole coils composition as the core texture of duplexer, the present invention can support that transmitting chain power is put
The power output of big more than device 27dBm, meets the demand of practical application.
In sum, the present invention provides a kind of communication RF front-end module and communication means, including：It is connected with antenna, for cutting
Change the duplexer of transmission link；Duplexer is connected to, for isolation input, output signal, while supporting multi-band signal
The duplexer of transmission；Duplexer is connected to, for the output signal of transmitter to be transferred to the power amplifier of duplexer；Connection
In duplexer, for input signal to be transferred to the low-noise amplifier of receiver.By adjusting impedance balance network, will communication
RF front-end module arranges corresponding frequency range；The signal of corresponding band is received by antenna, and is sent to the first order of duplexer
Coil, the first order coil are coupled a signal to second level coil and low-noise amplifier are transferred in the way of difference mode signal,
Subsequently into receiver；Transmitter sends signal, and the first order coil of the duplexer is input to Jing after power amplifier amplifies,
And the antenna is exported, meanwhile, the first order coil is coupled a signal to second level coil and is passed in the way of common-mode signal
Defeated the common-mode signal is eliminated by the low-noise amplifier to the low-noise amplifier, is reached the transmitter and described is connect
The isolation of signal between receipts machine.The communication RF front-end module and communication means of the present invention effectively can be simplified needed for radio-frequency front-end
Number of devices, support multiple communications bands, noise coefficient is little, meet the demand of practical application.So, the present invention effectively overcomes
Various shortcoming of the prior art and have high industrial utilization.
The principle and its effect of above-described embodiment only illustrative present invention, it is of the invention not for limiting.It is any to be familiar with this skill
The personage of art all can carry out modifications and changes to above-described embodiment under the spirit and the scope without prejudice to the present invention.Therefore, such as
Those of ordinary skill in the art completed under without departing from disclosed spirit and technological thought all etc.
Effect modifications and changes, should be covered by the claim of the present invention.
Claims (9)
1. a kind of communication RF front-end module, it is characterised in that the communication RF front-end module at least includes：
Duplexer, duplexer, power amplifier and low-noise amplifier；
Wherein, the duplexer is connected with antenna, for switching transmission link；
The duplexer is connected with the duplexer, the power amplifier and the low-noise amplifier, for institute
The signal for stating power amplifier and low-noise amplifier transmission is isolated, while supporting the transmission of multi-band signal；
The input of the power amplifier is connected to transmitter, outfan and is connected to the duplexer, for receiving described sending out
The signal that the machine of penetrating is sended over, and after carrying out processing and amplifying, it is transferred to the duplexer；
The input of the low-noise amplifier is connected to the duplexer, outfan and is connected to receiver, described for receiving
The signal that duplexer is sended over, and after carrying out processing and amplifying, it is transferred to the receiver.
2. communication RF front-end module according to claim 1, it is characterised in that：The duplexer includes mixing autotransformer
And impedance balance network, realize that the power amplifier is passed to the low-loss of the antenna by the mixing autotransformer
It is defeated, and the antenna is to the low-loss transmission of the low-noise amplifier；By leading to described in the impedance balance real-time performance
Letter support of the RF front-end module to multiple working frequency range.
3. communication RF front-end module according to claim 2, it is characterised in that：The mixing autotransformer includes the first order
Coil and second level coil, wherein, the first end of the first order coil is connected with the duplexer, centre tap is connected
The power amplifier, the second end connect the impedance balance network；The second level coil connects the low-noise amplifier
Input.
4. communication RF front-end module according to claim 2, it is characterised in that：The impedance balance network includes the electricity of parallel connection
Hold array and electric resistance array, the capacitor array and the electric resistance array can be adjusted by external signal, and then realize
Control to impedance.
5. communication RF front-end module according to claim 1, it is characterised in that：The low-noise amplifier is that differential configuration is low
Noise amplifier.
6. communication RF front-end module according to claim 1, it is characterised in that：Also it is connected with the antenna including one end, separately
The tunable capacitor of one end ground connection, for the impedance matching of antenna port.
7. communication RF front-end module according to claim 1, it is characterised in that：The duplexer is integrated unit on piece.
8. a kind of communication means of communication RF front-end, it is characterised in that the communication means of the communication RF front-end at least includes：
Impedance balance network is adjusted, communication RF front-end module is arranged into corresponding frequency range；
The signal of corresponding band is received by antenna, and is sent to the first order coil of duplexer, the first order coil will be believed
Number it is coupled to second level coil and low-noise amplifier is transferred in the way of difference mode signal, subsequently into receiver；
Transmitter sends signal, is input to the first order coil of the duplexer, and exports institute Jing after power amplifier amplifies
Antenna is stated, meanwhile, the first order coil is coupled a signal to second level coil and is transferred in the way of common-mode signal described
The common-mode signal is eliminated by low-noise amplifier, the low-noise amplifier, reach the transmitter and the receiver it
Between signal isolation.
9. the communication means of communication RF front-end according to claim 8, it is characterised in that：The impedance balance network is adjusted,
Which is made to meet following relational expression：Wherein, RANTFor the impedance of antenna port, RBALIt is flat for the impedance
The impedance of weighing apparatus network, N1The coil turn between the antenna and the transmitter, N are located at for the first order coil2For
The first order coil is located at the coil turn between the impedance balance network and the transmitter.
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| CN114759882A (en) * | 2022-05-06 | 2022-07-15 | 广东工业大学 | Dual-frequency coupling low-noise amplification circuit and amplifier |
| WO2022237325A1 (en) * | 2021-05-11 | 2022-11-17 | 荣耀终端有限公司 | Radio frequency front-end, chip and device |
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| US11742807B1 (en) | 2023-02-14 | 2023-08-29 | Guangdong University Of Technology | Dual-band coupling low-noise amplifying circuit and amplifier |
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| WO2022237325A1 (en) * | 2021-05-11 | 2022-11-17 | 荣耀终端有限公司 | Radio frequency front-end, chip and device |
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| WO2023134003A1 (en) * | 2022-01-17 | 2023-07-20 | 中国电子科技集团公司第五十四研究所 | Radio-frequency front-end assembly |
| WO2023141947A1 (en) * | 2022-01-28 | 2023-08-03 | 华为技术有限公司 | Transceiver circuit, transceiver, and related apparatus |
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