CN207442798U - 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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- CN207442798U CN207442798U CN201721069732.1U CN201721069732U CN207442798U CN 207442798 U CN207442798 U CN 207442798U CN 201721069732 U CN201721069732 U CN 201721069732U CN 207442798 U CN207442798 U CN 207442798U
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- directional coupler
- output matching
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Abstract
The utility model discloses a kind of output matching network circuit with directional coupler, the output matching network circuit includes at least level-one match circuit and directional coupler；Wherein, the match circuit, for the load impedance of the output matching network circuit output end rear end to be matched to the load impedance 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 circuits with directional coupler output matching network circuit.
Description
Technical field
The utility model is related to electronic technology field more particularly to a kind of output matching network electricity with directional coupler
Road and the 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 to complete the amplification output function of radiofrequency signal, and therefore, output power is that radio-frequency power amplifier is important
Performance indicator；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, since mobile communication terminal needs to be compatible with more and more 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 tetra- parts of directional coupler 104a 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 entire radio-frequency power amplifier is connected to, the loss of output matching network 103a
The output power 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 the performance of matching network 103a also largely influences the performance of entire radio-frequency power amplifier.
In modern wireless communication systems, in order to improve the efficiency of entire 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 output power 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 in afterwards, and the output power of power amplifier is coupled out a part proportional to output power and is 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 output power, and further realize dynamic control；Wherein, directional coupler is normally at radio frequency work(
The output terminal 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 there are many different frequency, 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 integrate multichannel pmultiple amplifier.The advantages of this design method is flexible design, each intermodule
Interference is smaller；Shortcoming is of high cost, area is big, is limited by the factors such as encapsulation, it is impossible to accomplish 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 generally 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.Shown in realization framework such as Fig. 1 (c) of scheme two, 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 exporting switch 103c；Compared to side
Case one, this scheme can reduce the area of active circuit, reduce manufacture 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 of additional and directional coupler 106d.Shown in realization framework such as Fig. 1 (d) of scheme three, with scheme two
It compares, 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 exporting switch 104d again afterwards
With the switching of frequency band match network 105d, 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 manufacture cost.
Scheme four is to share signal amplifier 102e, and output matching network 103e is designed as 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 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 can further reduce output matching network on the basis of scheme three
The area of circuit reduces manufacture cost.
Scheme five is to share signal amplifier 102f, and output matching network 103f is designed as wide band system.This scheme
Shown in structure such as Fig. 1 (f).In this scheme, 103f network designs are matched using shared signal amplifier 102f, and by output
Into the mode of Broadband Matching, in 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 reduces manufacture cost.
From said program as can be seen that scheme one is since 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 generally relatively low, and switching switch, which is added, can introduce the loss of bigger, 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, since 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 terminal of directional coupler position radio-frequency power amplifier, the loss additionally introduced can reduce radio-frequency power and put
The output power of big device influences 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.
Utility model content
In view of this, the utility model embodiment provides a kind of output matching network circuit and band with directional coupler
Have the rf power amplifier circuit of directional coupler output matching network circuit, can reduce rf power amplifier circuit area,
Cost is reduced, simplifies the structure complexity of rf power amplifier circuit, improve integrated level.
In order to achieve the above objectives, the technical solution of the utility model embodiment is realized in：
The utility model embodiment provides a kind of output matching network circuit with directional coupler, the output
Distribution network circuit includes at least level-one 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 level-one with capacitance with capacitance
L-shaped match circuit；
The input terminal of the transmission line or inductance is connected with the input terminal of the match circuit, and output terminal matches electricity with described
The output terminal on road is connected with the input terminal of capacitance, the output head grounding of the capacitance and the transmission line or inductance in parallel；
When the match circuit by include it is multistage by transmission line in parallel or inductance is in parallel with capacitance with capacitance when, first
The input terminal of grade match circuit transmission line or inductance is connected with the input terminal of the match circuit, and output terminal matches electricity with next stage
The connection of the input terminal of transmission line or inductance is connected in road, and so on, afterbody match circuit transmission line or inductance are defeated
Outlet is connected with the output terminal of the match circuit, wherein, transmission line or inductance output end and the electricity of the match circuits at different levels
The input terminal connection of appearance, the capacitance 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
It closes.
Wherein, the directional coupler is additionally operable to couple the obtained radiofrequency signal of preset ratio from itself output terminal
It is sent to detecting circuit.
Wherein, the parity mode impedance of the directional coupler needs to meet：Wherein,Represent coupling
The odd mode impedance of transmission line,Represent the even mode impedance of coupled transmission line, ZinRepresent the resistance of directional coupler input terminal front end load
It is anti-, ZloadRepresent directional coupler output terminal 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,Represent the odd mode impedance of coupled transmission line,Represent the even mode impedance of coupled transmission line, Zin
Represent directional coupler input terminal front end load impedance, ZloadRepresent directional coupler output terminal 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 utility model embodiment additionally provides a kind of radio-frequency power with directional coupler output matching network circuit
Amplifying circuit, the rf power amplifier circuit include signal amplifier, output switch and output matching network circuit；Its
In,
The signal amplifier is connected with the output matching network circuit, after signal is amplified, inputs institute
State output matching network circuit；
It is described output switch, be connected with the output matching network circuit, for by signal switch to different frequency ranges into
Row is sent；
The output matching network circuit, and signal amplifier and output switch connection, for by the output pair 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 utility model embodiment.
The output matching network circuit and rf power amplifier circuit that the utility model embodiment provides, the output matching
The match circuit of lattice network, it is described defeated for the load impedance of the output matching network circuit output end rear end to be matched to
Go out the impedance needed for matching network circuit input terminal front end；The directional coupler of the output matching network circuit and the matching
Circuit is coupled, and the radiofrequency signal transmitted in the match circuit is preset by field coupling and/or magnetic coupling
The radiofrequency signal of ratio is exported to detecting circuit, in this way, the output matching network by carrying directional coupler, completes signal
Output impedance achievees the purpose that quantifiable signal couples while matching to load impedance, monitor the real-time output work of radiofrequency signal
Rate.
Compare the prior art, the output matching network circuit with directional coupler that the utility model embodiment proposes
And the rf power amplifier circuit of the output matching network circuit with directional coupler.Directional coupler and match circuit are set
Meter together, makes directional coupler accurately detect the output power of radiofrequency signal in match circuit, due to that need not design
Additional independent directional coupler circuit, it therefore reduces the area of rf power amplifier circuit, simplifies with orientation coupling
The complex degree of structure of the match circuit of clutch can be obviously reduced the circuit needed using the match circuit with directional coupler
Size makes the design of interlock circuit and exploitation more flexible, and greatly reduces the holistic cost of wireless communication terminal.
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 that output matching network circuit structure of the utility model embodiment with directional coupler is illustrated
Figure；
Fig. 3 (a)~(b) is the structural representation of rf power amplifier circuit in the utility model embodiment two.
Specific embodiment
The characteristics of in order to more fully hereinafter understand the utility model and technology contents, below in conjunction with the accompanying drawings to this practicality
New realization is described in detail, appended attached drawing purposes of discussion only for reference, is not used for limiting the utility model.
Embodiment one
Fig. 2 is the output matching network electrical block diagram that the utility model embodiment carries directional coupler, wherein,
Fig. 2 (a) is the output matching network structure diagram that the utility model embodiment single-stage carries directional coupler, and Fig. 2 (b) is this
Utility model embodiment single-stage match circuit structure diagram, Fig. 2 (c) are N grades of match circuit structures of the utility model embodiment
Schematic diagram, Fig. 2 (d) (e) are that multi-level output matching network circuit structure of the utility model embodiment with directional coupler is shown
It is intended to.
As shown in Fig. 2 (a), the output matching network circuit bag with directional coupler of the utility model embodiment offer
Include directional coupler and output matching network circuit；Wherein, the output matching network circuit with directional coupler includes
At least level-one match circuit and directional coupler；Wherein, the match circuit, by by transmission line 201a and capacitance 202a simultaneously
Connection or the L-shaped match circuit that composes in parallel of inductance 201a and capacitance 202a, for by the output matching network circuit output end
The load impedance of rear end is matched to the impedance needed for the output matching network circuit input end front end；The directional 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
The radiofrequency signal that field coupling obtains preset ratio is exported to the coupled transmission line 203a of the directional coupler, is exported to detection electricity
Lu Zhong obtains the d. c. voltage signal with radio-frequency signal output power information, and baseband chip is according to the d. c. voltage signal
Realize the dynamic monitoring to communication terminal output power.
In the prior art, output matching network circuit is separately designed with directional coupler；And in this practicality
In new embodiment, by directional coupler design in output matching network, therefore, with fixed in the utility model embodiment
The match circuit of line coupler reduces the area of matching network circuit and directional coupler circuit in design.
In the utility model embodiment, the coupled transmission line 203a of directional coupler and transmission line/electricity of matching network
Sense 201a is coupled, and the radiofrequency signal on matching network transmission line is coupled to the coupling of directional coupler according to preset ratio
It closes in transmission line 203a；As shown in Fig. 2 (b), single-stage output matching network includes one group by transmission line 201b and capacitance 202b
The L-shaped matching network circuit that parallel connection or inductance 201b and capacitance 202b are composed in parallel, specific input is matched to by load impedance
Impedance, but be not limited thereto in practical applications, the load impedance of antenna is generally in 50 ohms, therefore, matching network
It is commonly designed as in parallel or inductance is composed in parallel with capacitance with capacitance by the transmission line of plural serial stage, passes through as shown in Fig. 2 (c)
It adjusts different inter-stage impedances and meets the insertion loss of matching network or the design requirement of bandwidth.
Fig. 2 (d) is the matching with directional coupler that the utility model embodiment is applied to multistage matching network structure
Schematic network structure, transmission line/inductance (201d, 203d), capacitance (202d, 204d) and use including being used for impedance matching
In the coupled transmission line (205d) of coupling.Multi-level output matching network in practical applications, as shown in Fig. 2 (e), directional coupler
Can with coupling matching network one or more levels, wherein, the coupled transmission line 205d of directional coupler is with matching electricity in Fig. 2 (d)
First order transmission line/inductance 201d in road is coupled, and the coupled transmission line 205e of directional coupler is with matching in Fig. 2 (e)
Transmission line/inductance 203e of the 2nd grade of circuit to afterbody match circuit is coupled, in practical applications, directional couple
The coupled transmission line of device be not limited in coupling multistage matching network certain specific level-one or what, also, directional coupler two
End is no longer standard termination impedance of the prior art, therefore, the parity mode of the directional coupler in the utility model embodiment
Characteristic impedance needs to meet the following conditions respectively：
Wherein,Represent the odd mode impedance of coupled transmission line,Represent the even mode impedance of coupled transmission line, ZinRepresent fixed
To coupler input front end load impedance, ZloadRepresent directional coupler output terminal backend load impedance；
Wherein, CMAXRepresent the maximum coefficient of coup of directional coupler,Represent the odd mode impedance of coupled transmission line,Table
Show the even mode impedance of coupled transmission line, ZinRepresent directional coupler input terminal front end load impedance, ZloadRepresent directional coupler
Output terminal 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 practical applications, the output matching network circuit with directional coupler that the utility model embodiment is proposed
GaAs (GaAs) technique, insulator silicon (SOI) technique, complementary metal oxide semiconductor (CMOS) technique, collection may be employed
It realizes, can also be realized on the substrates such as polytetrafluoroethylene (PTFE) (FR4) into semiconductor technologies such as passive device (IPD) techniques.
Embodiment two
On the basis of embodiment one, as shown in figure 3, the utility model embodiment provides one kind with directional coupler
Output matching network circuit rf power amplifier circuit, wherein, Fig. 3 (a) is that the utility model embodiment is antenna front ends
Rf power amplifier circuit structure diagram with directional coupler, Fig. 3 (b) are the utility model embodiment list directional couple
Device rf power amplifier circuit structure diagram.Wherein,
As shown in Fig. 3 (a), the rf power amplifier circuit that the utility model embodiment provides includes：Signal amplifier
302a, output switch 304a, detecting circuit 307a and the matching network circuit 303a with directional coupler；Wherein,
The signal amplifier 302a 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, is connected with the matching network circuit 303a, for signal to be switched to different frequencies
Duan Jinhang is sent；
The detecting circuit 307a is connected with the matching network circuit 303a, for that will carry of directional coupler
The output power that the output power of distribution network circuit 303a 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
It states and is understood, which is not described herein again.
In practical applications, as shown in Fig. 3 (a), believe in the rf power amplifier circuit that the utility model embodiment provides
Number through output switch after radiofrequency signal can be matched again through output matching network further according to actual demand, into one
It walks the load impedance of the impedance matching of antenna to output terminal；Or, as shown in Fig. 3 (b), to simplify rf power amplifier circuit
Design, radiofrequency signal directly send radiofrequency signal after output switchs on antenna load.
The power control circuit that the utility model embodiment provides, by being one by directional coupler and Match circuits
A entirety achievees the purpose that quantifiable signal couples while load impedance conversion is completed, and compare the prior art, effectively reduces
The complexity of matching network can be obviously reduced the size of radio-frequency power amplifier module, so as to greatly reduce channel radio
Believe the holistic cost of terminal, the design for making rf power amplifier circuit is more flexible.
The above is only the preferred embodiment of the utility model, is not intended to limit the protection of the utility model
Scope.
Claims (9)
- A kind of 1. output matching network circuit with directional coupler, which is characterized in that the output matching network circuit bag Include at least level-one match circuit and directional coupler；Wherein, the match circuit, for the output matching network circuit is defeated The load impedance of outlet rear end is matched to the load impedance needed for the output matching network circuit input end front end；The orientation The radiofrequency signal transmitted in the match circuit for being coupled with the match circuit, is passed through field coupling by coupler And/or magnetic coupling obtains the radiofrequency signal output of preset ratio.
- 2. output matching network circuit according to claim 1, which is characterized in that the match circuit includes at least level-one By the transmission line L-shaped match circuit that in parallel or inductance is composed in parallel with capacitance with capacitance；The input terminal of the transmission line or inductance It is connected with the input terminal of the match circuit, output terminal is connected with the output terminal of the match circuit and the input terminal of capacitance, institute State the output head grounding of capacitance and the transmission line or inductance in parallel；When the match circuit is multistage by transmission line and electricity by including When holding parallel connection or inductance in parallel with capacitance, the input terminal of first order match circuit transmission line or inductance and the match circuit Input terminal connection, output terminal is connected with the input terminal of transmission line or inductance in next stage match circuit and connects, with such It pushing away, afterbody match circuit transmission line or inductance output end are connected with the output terminal of the match circuit, wherein, it is described at different levels The transmission line or inductance output end of match circuit and the input terminal of capacitance connect, the capacitance output head grounding.
- 3. output matching network circuit according to claim 2, which is characterized 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, which is characterized in that the directional coupler at least with it is described Primary Transmit line or inductance in output matching network are coupled.
- 5. output matching network circuit according to any one of claims 1 to 4, which is characterized in that the directional coupler, It is additionally operable to the radiofrequency signal for coupling obtained preset ratio being sent to detecting circuit from itself output terminal.
- 6. output matching network circuit according to any one of claims 1 to 4, which is characterized in that the directional coupler Parity mode impedance need to meet：Wherein,Represent the odd mode impedance of coupled transmission line,Represent coupling The even mode impedance of transmission line, ZinRepresent directional coupler input terminal front end load impedance, ZloadRepresent directional coupler output terminal Backend load impedance.
- 7. output matching network circuit according to claim 6, which is characterized in that the coefficient of coup of the directional coupler It needs to meet：Wherein, CMAXRepresent the maximum coefficient of coup of directional coupler,Represent coupled transmission line Odd mode impedance,Represent the even mode impedance of coupled transmission line, ZinRepresent directional coupler input terminal front end load impedance, ZloadRepresent directional coupler output terminal backend load impedance.
- 8. output matching network circuit according to claim 7, which is characterized in that the coefficient of coup of the directional coupler It also needs 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, which is characterized in that described to penetrate Frequency power amplification circuit includes signal amplifier, output switch and output matching network circuit；Wherein,The signal amplifier is connected with the output matching network circuit, and after signal is amplified, input is described defeated Go out matching network circuit；The output switch, is connected with the output matching network circuit, is sent out for signal to be switched to different frequency ranges It 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 terminal 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 claim 1 to 8 any one of them output matching network circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404294A (en) * | 2017-08-23 | 2017-11-28 | 广州慧智微电子有限公司 | A kind of output matching network circuit and amplifying circuit with directional coupler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404294A (en) * | 2017-08-23 | 2017-11-28 | 广州慧智微电子有限公司 | A kind of output matching network circuit and amplifying circuit with directional coupler |
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Address after: 510663 8th floor, building C2, Chuangxin building, No. 182, Kexue Avenue, Huangpu District, Guangzhou, Guangdong Patentee after: Guangzhou Huizhi Microelectronics Co.,Ltd. Address before: 510663 unit c3-802, innovation building, 182 science Avenue, Science City, Guangzhou high tech Industrial Development Zone, Guangdong Province Patentee before: SMARTER MICROELECTRONICS (GUANG ZHOU) Co.,Ltd. |
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