CN107404294A - A kind of output matching network circuit and amplifying circuit with directional coupler - Google Patents
A kind of output matching network circuit and amplifying circuit with directional coupler Download PDFInfo
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- CN107404294A CN107404294A CN201710729856.6A CN201710729856A CN107404294A CN 107404294 A CN107404294 A CN 107404294A CN 201710729856 A CN201710729856 A CN 201710729856A CN 107404294 A CN107404294 A CN 107404294A
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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Abstract
The invention discloses a kind of output matching network circuit with directional coupler, the output matching network circuit includes at least one-level match circuit and directional coupler；Wherein, the match circuit, for the load impedance being matched to the load impedance of the output matching network circuit output end rear end needed for the output matching network circuit input end front end；The directional coupler, for being coupled with the match circuit, the radiofrequency signal that the radiofrequency signal transmitted in the match circuit is obtained to preset ratio by field coupling and/or magnetic coupling exports.The invention also discloses a kind of rf power amplifier circuit with directional coupler output matching network circuit.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of output matching network circuit with directional coupler and
Rf power amplifier circuit with the matching network.
Background technology
In modern wireless communication systems, radio-frequency power amplifier be radio frequency signal transmission in critical component, radio frequency
Power amplifier is used for the amplification output function for completing radiofrequency signal, and therefore, power output is that radio-frequency power amplifier is important
Performance indications；In addition, output matching network and output directional coupler are respectively utilized to complete the matching output of power match
And the function of monitoring, it is vital into part in radio-frequency power amplifier.
In current Design of RF Power Amplifier, because mobile communication terminal needs compatible increasing communication protocols
View, radio-frequency power amplifier output par, c also increasingly stronger to the design requirement of radio-frequency power amplifier Multiband-multimode
Design also become increasingly complex.
The framework of the radio-frequency power amplifier with directional coupler is as shown in figure 1, mainly by information source 101a at present
Pre-amplifier, output transistor 102a, output matching network 103a and the parts of directional coupler 104a tetra- are formed；Wherein, it is defeated
Go out matching network 103a and complete conversion of the load impedance to output load line, the size of load line determines that transistor 102a is defeated
Go out the size of power；Simultaneously as the least significant end of whole radio-frequency power amplifier is connected to, output matching network 103a loss
The power output of radio-frequency power amplifier is directly influenced, and then also affects the efficiency of radio-frequency power amplifier, so, it is defeated
Going out matching network 103a performance also largely influences the performance of whole radio-frequency power amplifier.
In modern wireless communication systems, in order to improve the efficiency of whole mobile communication terminal system, it usually needs to end
The transmission power at end carries out power monitoring, Mobile state control of going forward side by side.In current implementation, power monitoring is mainly by detecting
The power output of power amplifier is realized.Specific implementation such as Fig. 1 (a), in output matching of power amplifier network 103a
Directional coupler 104a is added afterwards, and the power output of power amplifier is coupled out a part proportional to power output and sent
Enter detecting circuit 106a, obtain the d. c. voltage signal with output power information, be sent into base band control chip, realize to movement
The dynamic monitoring of communication terminal power output, and further realize dynamic control；Wherein, directional coupler is normally at radio frequency work(
The output end of rate amplifier, therefore, outside the indexs such as the coefficient of coup, directionality, insertion loss is also the weight of directional coupler
Want design objective.
To meet the needs of practical application, the radiofrequency signal of a variety of different frequencies, power amplification are included in radiofrequency signal
Device needs the radiofrequency signal for the multifrequency to be designed, and the Designing power amplifier in multifrequency application mainly has with lower section
Case：
Scheme one is directly to be integrated multichannel pmultiple amplifier.The advantages of this design method is flexible design, each intermodule
Interference is smaller；Shortcoming is that cost is high, area is big, is limited by the factors such as encapsulation, it is impossible to accomplished the integrated of multiband.In this scheme
Under, shown in method such as Fig. 1 (b) that output matching network 103b and directional coupler 104b is typically used, each way RF power
Amplifier output uses independent output matching network 103b and directional coupler 104b, and output matching network 103b is exported to not
With the output pin of frequency band, the input and output of coupler are connected to directional coupler 104b.
Scheme two is the method for sharing signal amplifier 102c, different frequency bands using independent output matching network 104c and
Directional coupler 105c.Scheme two is realized shown in framework such as Fig. 1 (c), compared to scheme one, in this scheme, different frequency bands
Signal amplifier 102c is shared, the output matching network 104c of different frequency range is switched to by output switch 103c；Compared to side
Case one, this scheme can reduce the area of active circuit, reduce manufacturing cost.
Scheme three is to share signal amplifier 102d and part output matching network 103d, and is directed to different frequency range design
The matching network 105d and directional coupler 106d of additional.Scheme three is realized shown in framework such as Fig. 1 (d), with scheme two
Compare, this scheme also shares a part of matching network 103d in addition to shared signal amplifier 102d, shares output matching network
The load impedance that output transistor needs can be matched to higher resistance by 103d, be carried out not by output switch 104d again afterwards
With frequency band match network 105d switching, the performance of output matching network is improved.Meanwhile this scheme can be on the basis of scheme two
The upper area for further reducing output matching network circuit, reduces manufacturing cost.
Scheme four is to share signal amplifier 102e, and output matching network 103e is designed as into adjustable mode.This scheme
Shown in structure such as Fig. 1 (e), in this scheme, designed using shared signal amplifier 102e, and by output matching network 103e
Into the adjustable mode of multiband, in switch switching need not be carried out in matching network 103e the advantages of this scheme, with adjustable
Mode complete different frequency range matching output；This scheme further can reduce output matching network on the basis of scheme three
The area of circuit, reduce manufacturing cost.
Scheme five is to share signal amplifier 102f, and output matching network 103f is designed as into wide band system.This scheme
Shown in structure such as Fig. 1 (f).In this scheme, using shared signal amplifier 102f, and by output matching 103f network designs
Into the mode of Broadband Matching, in switch switching need not be carried out in matching network 103f the advantages of this scheme, with broadband
Mode completes the matching output of different frequency range；This scheme can further reduce output matching network electricity on the basis of scheme three
The area on road, reduce manufacturing cost.
From such scheme as can be seen that scheme one is because its flexible design, each band interference are smaller, in multi-frequency multi-mode
It is used first in Designing power amplifier；But this scheme is limited by the factor of integrated level and cost.Scheme two is put due to radio frequency
Big tube core connects that load impedance is typically relatively low, and bigger loss can be introduced by switching is added switching, therefore in the design one
As less be used；And other schemes three, four, five have been widely studied at present.Obviously, in scheme three, four, five, all need
To increase directional coupler unit after output matching network, add the complexity of Design of RF Power Amplifier.Together
When, because the output of each road needs independent directional coupler, in the application of more multiband, design can be made to become increasingly complex.
Further, since the output end of directional coupler position radio-frequency power amplifier, the loss additionally introduced can reduce radio-frequency power and put
The power output of big device, influence the efficiency of radio-frequency power amplifier.In the trend of Modern wireless communication terminal Multiband-multimode
Under, designing a kind of miniaturization output matching network and directional coupling structure becomes very necessary.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of output matching network circuit with directional coupler and with fixed
To the rf power amplifier circuit of coupler output matching network circuit, the area of rf power amplifier circuit can be reduced, reduced
Cost, simplify the structure complexity of rf power amplifier circuit, improve integrated level.
To reach above-mentioned purpose, what the technical scheme of the embodiment of the present invention was realized in：
The embodiments of the invention provide a kind of output matching network circuit with directional coupler, the output matching net
Network circuit includes at least one-level match circuit and directional coupler；Wherein,
The match circuit, it is described for the load impedance of the output matching network circuit output end rear end to be matched to
Load impedance needed for output matching network circuit input end front end；
The directional coupler, for being coupled with the match circuit, the radio frequency that will be transmitted in the match circuit
The radiofrequency signal that signal obtains preset ratio by field coupling and/or magnetic coupling exports.
Wherein, the match circuit is including at least by transmission line, in parallel or inductance composes in parallel one-level with electric capacity with electric capacity
L-shaped match circuit；
The input of the transmission line or inductance is connected with the input of the match circuit, and output end matches electricity with described
The output end on road connects with the input of electric capacity, the output head grounding of the electric capacity and the transmission line or inductance in parallel；
When the match circuit by including multistage by transmission line in parallel or inductance is in parallel with electric capacity with electric capacity when, first
The input of level match circuit transmission line or inductance is connected with the input of the match circuit, and output end matches electricity with next stage
The connection of the input of transmission line or inductance is connected in road, and by that analogy, afterbody match circuit transmission line or inductance are defeated
Go out end to be connected with the output end of the match circuit, wherein, transmission line or inductance output end and the electricity of the match circuits at different levels
The input connection of appearance, the electric capacity output head grounding.
Wherein, the L-shaped match circuit, for by the load impedance of the output matching network circuit output end rear end
It is assigned to the impedance needed for the output matching network circuit input end front-end amplifier.
Wherein, the directional coupler at least carries out coupling with the Primary Transmit line in the output matching network or inductance
Close.
Wherein, the directional coupler, it is additionally operable to couple the obtained radiofrequency signal of preset ratio from itself output end
Send to detecting circuit.
Wherein, the parity mode impedance of the directional coupler needs to meet：Z0eZ0o=ZinZload；Wherein, Z0eRepresent that coupling passes
The odd mode impedance of defeated line, Z0oRepresent the even mode impedance of coupled transmission line, ZinRepresent the resistance of directional coupler input front end load
It is anti-, ZloadRepresent directional coupler output end backend load impedance.
Wherein, the coefficient of coup of the directional coupler needs to meet：Wherein, CMAXRepresent orientation coupling
The maximum coefficient of coup of clutch, Z0eRepresent the odd mode impedance of coupled transmission line, Z0oRepresent the even mode impedance of coupled transmission line, Zin
Represent directional coupler input front end load impedance, ZloadRepresent directional coupler output end backend load impedance.
Wherein, the coefficient of coup of the directional coupler also needs to meet：Wherein, l represents orientation coupling
The length of coupled transmission line in clutch, λ represent the wavelength of directional coupler operating center frequency, CMAXRepresent directional coupler
The maximum coefficient of coup.
The embodiment of the present invention additionally provides a kind of radio-frequency power amplification with directional coupler output matching network circuit
Circuit, the rf power amplifier circuit include signal amplifier, output switch and output matching network circuit；Wherein,
The signal amplifier, it is connected with the output matching network circuit, after signal is amplified, inputs institute
State output matching network circuit；
The output switch, it is connected with the output matching network circuit, enters for signal to be switched into different frequency ranges
Row is sent；
The output matching network circuit, is connected with signal amplifier and output switch, for by the output matching net
The load impedance of network circuit output end rear end is matched to the resistance needed for the output matching network circuit input end front-end amplifier
It is anti-；
The output matching network circuit is the output matching network circuit described in the embodiment of the present invention.
Output matching network circuit and rf power amplifier circuit provided in an embodiment of the present invention, the output matching network
The match circuit of circuit, for the load impedance of the output matching network circuit output end rear end to be matched into the output
Impedance needed for distribution network circuit input end front end；The directional coupler of the output matching network circuit and the match circuit
Coupled, the radiofrequency signal transmitted in the match circuit is obtained into preset ratio by field coupling and/or magnetic coupling
Radiofrequency signal export to detecting circuit, in this way, by the output matching network with directional coupler, complete signal output
Impedance reaches the purpose of quantifiable signal coupling while matching to load impedance, monitor the real-time power output of radiofrequency signal.
Compare prior art, the output matching network circuit and band with directional coupler that the embodiment of the present invention proposes
There is the rf power amplifier circuit of the output matching network circuit of directional coupler.Directional coupler and Match circuits are existed
Together, directional coupler is made accurately to detect the power output of radiofrequency signal in match circuit, it is extra due to that need not design
Independent directional coupler circuit, it therefore reduces the area of rf power amplifier circuit, is simplified with directional coupler
Match circuit complex degree of structure, the circuit chi for needing to use the match circuit with directional coupler can be obviously reduced
It is very little, make the design of interlock circuit and exploitation more flexible, and greatly reduce the holistic cost of wireless communication terminal.
Brief description of the drawings
Fig. 1 (a)~(f) is the electrical block diagram of rf power amplifier circuit in the prior art；
Fig. 2 (a)~(e) is the output matching network electrical block diagram that the embodiment of the present invention carries directional coupler；
Fig. 3 (a)~(b) is the structural representation of rf power amplifier circuit in the embodiment of the present invention two.
Embodiment
In order to more fully hereinafter understand the features of the present invention and technology contents, below in conjunction with the accompanying drawings to the reality of the present invention
Now it is described in detail, appended accompanying drawing purposes of discussion only for reference, is not used for limiting the present invention.
Embodiment one
Fig. 2 is the output matching network electrical block diagram that the embodiment of the present invention carries directional coupler, wherein, Fig. 2
(a) the output matching network structural representation of directional coupler is carried for single-stage of the embodiment of the present invention, Fig. 2 (b) is real for the present invention
Apply a single-stage match circuit structural representation, Fig. 2 (c) is N level match circuit structural representations of the embodiment of the present invention, Fig. 2 (d)
(e) the multi-level output matching network circuit structural representation of directional coupler is carried for the embodiment of the present invention.
As shown in Fig. 2 (a), the output matching network circuit provided in an embodiment of the present invention with directional coupler includes fixed
To coupler and output matching network circuit；Wherein, the output matching network circuit with directional coupler is included at least
One-level match circuit and directional coupler；Wherein, the match circuit, by parallel by transmission line 201a and electric capacity 202a, or
The L-shaped match circuit that inductance 201a and electric capacity 202a are composed in parallel, for by the output matching network circuit output end rear end
Load impedance be matched to impedance needed for the output matching network circuit input end front end；The directional coupler, is used for
Coupled with the match circuit, the radiofrequency signal transmitted in the match circuit is passed through into field coupling and/or magnetic field coupling
The radiofrequency signal that conjunction obtains preset ratio is exported to the coupled transmission line 203a of the directional coupler, is exported to detecting circuit
In, the d. c. voltage signal with radio-frequency signal output power information is obtained, baseband chip is real according to the d. c. voltage signal
Now to the dynamic monitoring of communication terminal power output.
In the prior art, output matching network circuit is separately designed with directional coupler；And in the present invention
In embodiment, by directional coupler design in output matching network, therefore, alignment coupler is carried in the embodiment of the present invention
Match circuit reduce the area of matching network circuit and directional coupler circuit in design.
In embodiments of the present invention, transmission line/inductance of the coupled transmission line 203a of directional coupler and matching network
201a is coupled, and the radiofrequency signal on matching network transmission line is coupled to the coupling of directional coupler according to preset ratio
In transmission line 203a；As shown in Fig. 2 (b), single-stage output matching network includes one group by transmission line 201b and electric capacity 202b simultaneously
Connection, or the L-shaped matching network circuit that inductance 201b and electric capacity 202b are composed in parallel, load impedance is matched to specific input resistance
It is anti-, but be not limited thereto in actual applications, the load impedance of antenna is typically in 50 ohms, and therefore, matching network leads to
Standing to be calculated as in parallel with electric capacity by the transmission line of plural serial stage, or inductance composes in parallel with electric capacity, passes through tune as shown in Fig. 2 (c)
Save different inter-stage impedances and meet the insertion loss of matching network or the design requirement of frequency range.
Fig. 2 (d) is the matching network with directional coupler that the embodiment of the present invention is applied to multistage matching network structure
Structural representation, including transmission line/inductance (201d, 203d) for impedance matching, electric capacity (202d, 204d) and for coupling
The coupled transmission line (205d) of conjunction.In actual applications, as shown in Fig. 2 (e), directional coupler can be with for multi-level output matching network
Coupling matching network one or more levels, wherein, in Fig. 2 (d) in the coupled transmission line 205d of directional coupler and match circuit
First order transmission line/inductance 201d coupled, the coupled transmission line 205e and match circuit of directional coupler in Fig. 2 (e)
The 2nd grade of transmission line/inductance 203e to afterbody match circuit coupled, in actual applications, directional coupler
Coupled transmission line be not limited in coupling multistage matching network certain specific one-level or what, also, directional coupler both ends are not
It is standard termination impedance of the prior art again, therefore, the parity mode characteristic impedance of the directional coupler in the embodiment of the present invention
Need to meet following condition respectively：
Wherein,The odd mode impedance of coupled transmission line is represented,Represent the even mode impedance of coupled transmission line, ZinRepresent fixed
To coupler input front end load impedance, ZloadRepresent directional coupler output end backend load impedance；
Wherein, CMAXThe maximum coefficient of coup of directional coupler is represented,The odd mode impedance of coupled transmission line is represented,
Represent the even mode impedance of coupled transmission line, ZinRepresent directional coupler input front end load impedance, ZloadRepresent directional couple
Device output end backend load impedance；
Wherein, l represents the length of coupled transmission line in directional coupler, and λ represents directional coupler operating center frequency
Wavelength, CMAXRepresent the maximum coefficient of coup of directional coupler.
In actual applications, the output matching network circuit with directional coupler that the embodiment of the present invention is proposed can be with
Using GaAs (GaAs) technique, insulator silicon (SOI) technique, complementary metal oxide semiconductor (CMOS) technique, integrated nothing
The semiconductor technologies such as source device (IPD) technique are realized, can also be realized on the substrates such as polytetrafluoroethylene (PTFE) (FR4).
Embodiment two
On the basis of embodiment one, as shown in figure 3, the embodiments of the invention provide a kind of defeated with directional coupler
Go out the rf power amplifier circuit of matching network circuit, wherein, Fig. 3 (a) is that the embodiment of the present invention is that antenna front ends carry orientation
The rf power amplifier circuit structural representation of coupler, Fig. 3 (b) are that list directional coupler radio-frequency power of the embodiment of the present invention is put
Big electrical block diagram.Wherein,
As shown in Fig. 3 (a), rf power amplifier circuit provided in an embodiment of the present invention includes：It is signal amplifier 302a, defeated
Go out to switch 304a, detecting circuit 307a and the matching network circuit 303a with directional coupler；Wherein,
The signal amplifier 302a, it is connected with the matching network circuit 303a, for signal to be amplified, to institute
State matching network 303a inputs；
The output matching network circuit 303a, is connected with signal amplifier 302a and output switch 304a, for that will hinder
The load impedance of anti-matching network is transformed to the loadline impedance of power amplifier；
The output switch 304a, it is connected with the matching network circuit 303a, for signal to be switched to different frequencies
Section is transmitted；
The detecting circuit 307a, it is connected with the matching network circuit 303a, for by with directional coupler
The power output that distribution network circuit 303a power output is coupled out preset ratio is converted to d. c. voltage signal；
Here, the correlation that the output matching network 303a specifically can refer to output matching network circuit in embodiment one is retouched
State and understood, repeated no more here.
In actual applications, as shown in Fig. 3 (a), signal passes through in rf power amplifier circuit provided in an embodiment of the present invention
Radiofrequency signal can be matched again through output matching network further according to actual demand after output switch, further will
The impedance matching of antenna to output end load impedance；Or, as shown in Fig. 3 (b), to simplify setting for rf power amplifier circuit
Meter, radiofrequency signal directly send radiofrequency signal after output switch on antenna load.
Power control circuit provided in an embodiment of the present invention, by being one whole by directional coupler and Match circuits
Body, in the purpose for completing to reach quantifiable signal coupling while load impedance conversion, compare prior art, effectively reduces
The complexity of distribution network, the size of radio-frequency power amplifier module can be obviously reduced, it is whole so as to greatly reduce radio communication
The holistic cost at end, make the design of rf power amplifier circuit more flexible.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (9)
- A kind of 1. output matching network circuit with directional coupler, it is characterised in that the output matching network circuit bag Include at least one-level match circuit and directional coupler；Wherein, the match circuit, for the output matching network circuit is defeated Go out to hold the load impedance of rear end to be matched to load impedance needed for the output matching network circuit input end front end；The orientation Coupler, for being coupled with the match circuit, the radiofrequency signal transmitted in the match circuit is passed through into field coupling And/or magnetic coupling obtains the radiofrequency signal output of preset ratio.
- 2. output matching network circuit according to claim 1, it is characterised in that the match circuit includes at least one-level By the transmission line L-shaped match circuit that in parallel or inductance composes in parallel with electric capacity with electric capacity；The input of the transmission line or inductance It is connected with the input of the match circuit, output end is connected with the output end of the match circuit and the input of electric capacity, institute State the output head grounding and the transmission line or inductance in parallel of electric capacity；When the match circuit by including multistage by transmission line with electricity When holding parallel connection or inductance in parallel with electric capacity, the input of first order match circuit transmission line or inductance and the match circuit Input connection, output end is connected with the input of transmission line or inductance in next stage match circuit and connected, with such Pushing away, afterbody match circuit transmission line or inductance output end are connected with the output end of the match circuit, wherein, it is described at different levels The transmission line or inductance output end of match circuit and the input of electric capacity connect, the electric capacity output head grounding.
- 3. output matching network circuit according to claim 2, it is characterised in that the L-shaped match circuit, for by institute The load impedance for stating output matching network circuit output end rear end is matched to the output matching network circuit input end front end institute The load impedance needed.
- 4. output matching network circuit according to claim 2, it is characterised in that the directional coupler at least with it is described Primary Transmit line or inductance in output matching network are coupled.
- 5. the output matching network circuit according to any one of Claims 1-4, it is characterised in that the directional coupler, It is additionally operable to from itself output end send the radiofrequency signal for coupling obtained preset ratio to detecting circuit.
- 6. the output matching network circuit according to any one of Claims 1-4, it is characterised in that the directional coupler Parity mode impedance need to meet：Wherein,The odd mode impedance of coupled transmission line is represented,Represent coupling The even mode impedance of transmission line, ZinRepresent directional coupler input front end load impedance, ZloadRepresent directional coupler output end Backend load impedance.
- 7. output matching network circuit according to claim 6, it is characterised in that the coefficient of coup of the directional coupler Need to meet：Wherein, CMAXThe maximum coefficient of coup of directional coupler is represented,Represent coupled transmission line Odd mode impedance,Represent the even mode impedance of coupled transmission line, ZinDirectional coupler input front end load impedance is represented, ZloadRepresent directional coupler output end backend load impedance.
- 8. output matching network circuit according to claim 7, it is characterised in that the coefficient of coup of the directional coupler Also need to meet：Wherein, l represents the length of coupled transmission line in directional coupler, and λ represents directional couple The wavelength of device operating center frequency, CMAXRepresent the maximum coefficient of coup of directional coupler.
- 9. a kind of rf power amplifier circuit with directional coupler output matching network circuit, it is characterised in that described to penetrate Frequency power amplification circuit includes signal amplifier, output switch and output matching network circuit；Wherein,The signal amplifier, it is connected with the output matching network circuit, after signal is amplified, input is described defeated Go out matching network circuit；The output switch, it is connected with the output matching network circuit, is sent out for signal to be switched into different frequency ranges Send；The output matching network circuit, is connected with signal amplifier and output switch, for the output matching network is electric The load impedance of road output end rear end is matched to the impedance needed for the output matching network circuit input end front-end amplifier；The output matching network circuit is the output matching network circuit described in any one of claim 1 to 8.
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| CN109379053A (en) * | 2018-12-07 | 2019-02-22 | 曹秀妹 | Match circuit, load line switching method and the power amplifier of changeable load line |
| CN111316564A (en) * | 2018-01-30 | 2020-06-19 | 阿塞尔桑电子工业及贸易股份公司 | Power amplifier system |
| CN111541425A (en) * | 2020-04-11 | 2020-08-14 | 复旦大学 | Impedance matching circuit based on coupling transmission line |
| CN112909468A (en) * | 2021-02-08 | 2021-06-04 | 广州慧智微电子有限公司 | Dual-band supported bidirectional coupler and integrated circuit |
| WO2021135408A1 (en) * | 2019-12-31 | 2021-07-08 | 南京米乐为微电子科技有限公司 | Ultra-wideband microwave and millimeter wave differential power amplifier |
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| WO2023040472A1 (en) * | 2021-09-17 | 2023-03-23 | 深圳飞骧科技股份有限公司 | Coupling circuit and electronic device for 4g full-band power amplifier |
| CN115425934A (en) * | 2022-09-09 | 2022-12-02 | 佛山臻智微芯科技有限公司 | Output matching circuit of power amplifier |
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