CN116566342B - Adaptive impedance adjustment circuit - Google Patents
Adaptive impedance adjustment circuit Download PDFInfo
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- CN116566342B CN116566342B CN202310575706.XA CN202310575706A CN116566342B CN 116566342 B CN116566342 B CN 116566342B CN 202310575706 A CN202310575706 A CN 202310575706A CN 116566342 B CN116566342 B CN 116566342B
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- 230000003044 adaptive effect Effects 0.000 title claims description 13
- 238000012545 processing Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
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
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
- H03H11/30—Automatic matching of source impedance to load impedance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
Abstract
The invention discloses a self-adaptive impedance adjusting circuit which comprises a power amplifier, a directional coupler and a control logic circuit which are sequentially connected, wherein the self-adaptive impedance adjusting circuit further comprises an impedance tuning circuit, a first power detector and a second power detector, the output end of the power amplifier is connected with the input end of the impedance tuning circuit, the output end of the impedance tuning circuit is connected with the input end of the directional coupler, the output end of the directional coupler is used for being connected with a load, the input end of the first power detector is connected with the output end of the power amplifier, the input end of the second power detector is connected with the output end of the directional coupler, the output end of the first power detector and the output end of the second power detector are respectively connected with the input end of the control logic circuit, and the output end of the control logic circuit is connected to the input end of the impedance tuning circuit. The self-adaptive impedance adjusting circuit has strong anti-interference capability, high emission efficiency and wide application range.
Description
[ Field of technology ]
The invention relates to the technical field of communication, in particular to a self-adaptive impedance adjusting circuit.
[ Background Art ]
With the advent of the information age, wireless communication technology has been rapidly developed, and from cellular phones, wireless local area networks, bluetooth, etc., have become an integral part of social life and development. The progress of wireless communication technology has not been separated from the development of radio frequency circuits.
At present, in a radio frequency circuit, a transceiver chip outputs a modulated signal to an input end of a power amplifier, the power amplifier amplifies a small signal of the input signal and outputs the small signal, and a matching circuit impedance matches the small signal and outputs the small signal to a load, wherein the load can be an antenna, a cable and the like. The matching circuit is used to achieve an optimal impedance match between the amplifier output and the load so that the signal energy is maximally transferred out.
However, in an actual use scenario, the load impedance may not be fixed. In a mobile terminal such as a mobile phone, the impedance of an antenna is greatly changed along with the change of the use environment, and at the moment, impedance mismatch is generated between a power amplifier and the antenna, and the output energy of the power amplifier is reflected back, so that the anti-interference capability of a circuit is poor, and the emission efficiency of a radio frequency circuit is greatly reduced.
[ Invention ]
The embodiment of the invention aims to provide a self-adaptive impedance adjusting circuit so as to solve the problems of poor anti-interference capability and low emission efficiency of the conventional radio frequency circuit.
In order to solve the technical problems, the embodiment of the invention provides an adaptive impedance adjusting circuit which comprises a power amplifier, a directional coupler and a control logic circuit which are sequentially connected, wherein the adaptive impedance adjusting circuit further comprises an impedance tuning circuit, a first power detector and a second power detector, the output end of the power amplifier is connected with the input end of the impedance tuning circuit, the output end of the impedance tuning circuit is connected with the input end of the directional coupler, the output end of the directional coupler is used for being connected with a load, the input end of the first power detector is connected with the output end of the power amplifier, the input end of the second power detector is connected with the output end of the directional coupler, the output end of the first power detector and the output end of the second power detector are respectively connected with the input end of the control logic circuit, the output end of the control logic circuit is connected to the input end of the impedance tuning circuit, the first power detector and the second power detector respectively detect output signals of the power amplifier and the load to be connected with the output ends of the directional coupler, the first power detector and the second power detector respectively convert the output signals to the reverse-direction-reflected signals to the direct-current signals, and the second direct-current signals are respectively converted to the direct-current signals, and the direct-current signals are respectively controlled to realize the direct-current voltage adjustment and the direct-current adjustment circuit.
Preferably, the control logic circuit receives the first direct current voltage and the second direct current voltage, and calculates a reflection coefficient of the control signal, wherein the first direct current voltage is defined as Vdet1, the second direct current voltage is defined as Vdet2, and the reflection coefficient is R, and r=vdet2/Vdet 1.
Preferably, the reflection coefficient includes a plurality of R (n-1), the impedance tuning circuit includes a plurality of Tuner states and Tu (n-1), and the reflection coefficients are in one-to-one correspondence with the Tuner states, and n represents the number.
Preferably, the self-adaptive impedance adjusting circuit further comprises an external main control circuit, wherein an output end of the external main control circuit is connected with an input end of the control logic circuit, and an output end of the control logic circuit outputs the control signal to the impedance tuning circuit.
Preferably, the external master control circuit includes a first trigger unit and a second trigger unit, when the first trigger unit is in a state one, the control logic circuit works according to a preset time sequence, when the first trigger unit is in a state two, the control logic circuit detects that the second trigger unit is in a specific state, and performs a round of Tuner state polling and adjustment.
Preferably, the self-adaptive impedance adjusting circuit further comprises an inter-stage matching circuit, wherein the input end of the inter-stage matching circuit is connected with the output end of the power amplifier, and the output end of the inter-stage matching circuit is connected with the input end of the impedance tuning circuit.
Compared with the prior art, the self-adaptive impedance adjusting circuit has the advantages that the output end of the impedance tuning circuit is connected with the input end of the directional coupler, the output end of the directional coupler is used for being connected with a load, the input end of the first power detector is connected with the output end of the power amplifier, the input end of the second power detector is connected with the output end of the directional coupler, the output ends of the first power detector and the second power detector are respectively connected with the input end of the control logic circuit, the output end of the control logic circuit is connected to the input end of the impedance tuning circuit, the first power detector and the second power detector respectively detect output signals of the power amplifier and reverse signals reflected by the load to the directional coupler, the output signals and the reverse signals are respectively converted into the first direct voltage and the second direct voltage, the control logic circuit respectively receives the first direct voltage and the second direct voltage, and outputs control signals to the impedance tuning circuit after being processed together, so that the self-adaptive adjustment of the radio frequency circuit is convenient, the anti-interference capability of the impedance tuning circuit is strong, and the emission efficiency of the radio frequency circuit is greatly improved.
[ Description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a block diagram of an adaptive impedance adjusting circuit according to an embodiment of the present invention;
fig. 2 is a timing diagram of an adaptive impedance adjusting circuit according to an embodiment of the present invention.
The self-adaptive power control circuit comprises a self-adaptive impedance adjusting circuit (100), a power amplifier (1), an impedance tuning circuit (2), a directional coupler (3), a load (4), a first power detector (5), a second power detector (6), a control logic circuit (7), an external main control circuit (8), a first trigger unit (81), a second trigger unit (82) and a second trigger unit.
[ Detailed description ] of the invention
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-2, an embodiment of the present invention provides an adaptive impedance adjusting circuit 100, which includes a power amplifier, a directional coupler 3, and a control logic circuit 7 that are sequentially connected, where the adaptive impedance adjusting circuit 100 further includes an impedance tuning circuit 2, a first power detector 5, and a second power detector 6, an output end of the power amplifier is connected to an input end of the impedance tuning circuit 2, an output end of the impedance tuning circuit 2 is connected to an input end of the directional coupler 3, an output end of the directional coupler 3 is used to connect to a load 4, an input end of the first power detector 5 is connected to an output end of the power amplifier, an input end of the second power detector 6 is connected to an output end of the directional coupler 3, an output end of the first power detector 5 and an output end of the second power detector 6 are respectively connected to an input end of the control logic circuit 7, and an output end of the control logic circuit 7 is connected to an input end of the impedance tuning circuit 2; the first power detector 5 and the second power detector 6 respectively detect the output signal of the power amplifier and the reverse signal reflected by the load 4 to the directional coupler 3, and respectively convert the output signal and the reverse signal into a first direct current voltage and a second direct current voltage, and the control logic circuit 7 respectively receives the first direct current voltage and the second direct current voltage, and outputs a control signal to the impedance tuning circuit 2 after jointly processing the first direct current voltage and the second direct current voltage to realize self-adaptive adjustment.
Specifically, an amplified signal is output to the impedance tuning circuit 2 through an output end of the power amplifier, impedance tuning is performed by the impedance tuning circuit 2, the tuned amplified signal is output to the directional coupler 3 through the impedance tuning circuit 2, and the directional coupler 3 performs signal coupling output to the load 4, where the load 4 may be an antenna, a cable, or the like, and is used for implementing the function of the circuit load 4. The directional coupler 3 does not couple the forward output signal but only the reverse signal reflected from the load 4, which is fed to the second power detector 6 for conversion to a second direct current signal and to the control logic 7. The first power detector 5 is configured to detect an amplified signal output from an output terminal of the power amplifier, convert the amplified signal into a first dc voltage, and send the first dc voltage to the control logic circuit 7. The control logic circuit 7 receives the first direct current voltage and the second direct current voltage, processes the first direct current voltage and the second direct current voltage, and outputs a control signal to the impedance tuning circuit 2 to achieve the effect of impedance matching between the power amplifier and the load 4. Therefore, the radio frequency circuit is convenient to adjust in a self-adaptive manner, the impedance tuning circuit 2 is high in anti-interference capability, and the emission efficiency of the radio frequency circuit is greatly improved.
Alternatively, the power amplifier is sequentially connected to the directional coupler 3 and the impedance tuning circuit 2, so that the connection positions of the directional coupler 3 and the impedance tuning circuit 2 can be interchanged, and the generated functions are the same as those of the connection of the impedance tuning circuit 2 to the directional coupler 3, which will not be described in detail here.
In this embodiment, the control logic circuit 7 receives the first dc voltage and the second dc voltage, and calculates a reflection coefficient of the control signal, where the first dc voltage is defined as Vdet1, the second dc voltage is defined as Vdet2, and the reflection coefficient is R, r=vdet2/Vdet 1.
The control logic circuit 7 can calculate the reflection coefficient of the circuit according to the values of Vdet1 and Vdet2, and further judge the mismatch degree of the load 4. Since the modulus r=vdet2/vdet1, which defines the reflection coefficient, it is apparent that the higher the load 4 mismatch procedure, the stronger the reflected signal, the greater R. The Tuner parameter (tuning parameter) of the impedance tuning circuit 2 is adjusted by the control logic according to R, so that R is finally minimized, and the purpose of impedance matching of the amplifier and the load 4 is achieved.
In this embodiment, the reflection coefficients include a plurality of R (n-1), the impedance tuning circuit 2 includes a plurality of Tuner states and is a Tuner (n-1), and the reflection coefficients and the Tuner states are in one-to-one correspondence, where n represents the number.
The impedance tuning circuit 2 may be an impedance tuner, and the impedance tuner has n states, each of which has a different input/output impedance, and the value of n may be determined at the time of circuit design. The control logic 7 has a mapping table (or other forms such as two-dimensional array) therein, which has 2 columns and n rows. As shown in the table below, the left column is the Tuner state and the corresponding right column is the reflectance R.
| Tuner state | Reflection coefficient |
| Tu0 | R0 |
| Tu1 | R1 |
| Tu2 | R2 |
| ... | ... |
| Tu(n-1) | R(n-1) |
After the circuit is powered on and works normally, the control logic circuit 7 is started, the Tuner state of the impedance tuning circuit 2 is switched through a control signal, n states of the Tuner are polled, and the reflection coefficient R of the corresponding state is read and stored in a table. After polling the R values of the complete n states, the control logic compares the n R values to obtain a minimum R (m) and then Tu (m) m.ltoreq.n. During a subsequent period of time, the control logic controls Tuner to operate in a Tu (m) state.
Since the termination impedance may vary in operation, the control logic 7 detects the value of R (T may be hundreds of ms or more) from a preset timing T while comparing the reflection coefficient R with a preset reflection coefficient RLimit. If the reflection coefficient R > RLimit, then a new poll is started, otherwise no poll is made.
For example, T is 100ms, 200ms, or the like.
In this embodiment, the adaptive impedance adjusting circuit 100 further includes an external master control circuit 8, an output end of the external master control circuit 8 is connected to an input end of the control logic circuit 7, and an output end of the control logic circuit 7 outputs the control signal to the impedance tuning circuit 2. The control logic circuit 7 receives the first dc voltage and the second dc voltage respectively, and combines the received trigger signal of the external main control circuit 8 to output a control signal to the impedance tuning circuit 2, so as to realize adaptive adjustment. Therefore, the control modes of the impedance tuning circuit 2 are various, so that the radio frequency circuit is convenient to adjust in a self-adaptive manner, the anti-interference capability of the impedance tuning circuit 2 is high, and the emission efficiency of the radio frequency circuit is greatly improved.
In this embodiment, the external master control circuit 8 includes a first trigger unit 81 and a second trigger unit 82, when the first trigger unit 81 is in a state one, the control logic circuit 7 operates according to a preset time sequence, and when the first trigger unit 81 is in a state two, the control logic circuit 7 detects that the second trigger unit 82 is in a specific state, and performs a round of Tuner state polling and adjustment.
Wherein the external main control unit controls the control logic circuit 7 through two signal lines of the first trigger unit 81 and the second trigger unit 82. When the first trigger unit 81 is in the first state, the internal control logic 7 operates according to the preset time sequence, and when the first trigger unit 81 is in the second state, the second trigger unit 82 is in effect, and at this time, the internal control logic 7 only performs a polling and a Tuner adjustment when detecting that the second trigger unit 82 is in the specific state.
In this embodiment, the adaptive impedance adjusting circuit 100 further includes an inter-stage matching circuit, an input end of the inter-stage matching circuit is connected to an output end of the power amplifier, and an output end of the inter-stage matching circuit is connected to an input end of the impedance tuning circuit 2. The inter-stage matching circuit is used for matching the signal output by the power amplifier, so that the impedance tuning circuit 2 receives the matching signal output by the inter-stage matching circuit and has good impedance tuning effect.
Optionally, the inter-stage matching circuit generally includes a capacitor and a resistor, where the capacitor and the resistor are arranged in series or parallel and connected to an output end of the power amplifier, so as to improve circuit efficiency and avoid nonlinear distortion, and the safety is high.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (4)
1. The self-adaptive impedance adjusting circuit comprises a power amplifier, a directional coupler and a control logic circuit which are sequentially connected, and is characterized by further comprising an impedance tuning circuit, a first power detector and a second power detector, wherein the output end of the power amplifier is connected with the input end of the impedance tuning circuit, the output end of the impedance tuning circuit is connected with the input end of the directional coupler, the output end of the directional coupler is used for being connected with a load, the input end of the first power detector is connected with the output end of the power amplifier, the input end of the second power detector is connected with the output end of the directional coupler, the output end of the first power detector and the output end of the second power detector are respectively connected with the input end of the control logic circuit, and the output end of the control logic circuit is connected to the input end of the impedance tuning circuit; the first power detector and the second power detector respectively detect an output signal of the power amplifier and a reverse signal reflected by the load to the directional coupler, and respectively convert the output signal and the reverse signal into a first direct current voltage and a second direct current voltage; the control logic circuit receives the first direct-current voltage and the second direct-current voltage respectively, and outputs a control signal to the impedance tuning circuit after processing the first direct-current voltage and the second direct-current voltage together so as to realize self-adaptive adjustment;
The control logic circuit receives the first direct current voltage and the second direct current voltage and calculates the reflection coefficient of the control signal, wherein the first direct current voltage is defined as Vdet1, the second direct current voltage is defined as Vdet2, and the reflection coefficient is R, and R=Vdet2/Vdet 1;
the impedance tuning circuit comprises a plurality of Tuner states and is Tu (n-1), wherein the reflection coefficients are in one-to-one correspondence with the Tuner states, and n represents the number.
2. The adaptive tuning impedance circuit of claim 1, further comprising an external master circuit, an output of the external master circuit being coupled to an input of the control logic circuit, an output of the control logic circuit outputting the control signal to the impedance tuning circuit.
3. The adaptive tuning impedance circuit of claim 2 wherein the external master control circuit comprises a first trigger unit and a second trigger unit, the control logic circuit operates according to a predetermined sequence when the first trigger unit is placed in one of the states, and performs a round of Tuner state polling and tuning when the first trigger unit is placed in the second state and the control logic circuit detects that the second trigger unit is placed in the particular state.
4. The adaptive tuning impedance circuit of claim 1, further comprising an inter-stage matching circuit having an input coupled to the output of the power amplifier and an output coupled to the input of the impedance tuning circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310575706.XA CN116566342B (en) | 2023-05-19 | 2023-05-19 | Adaptive impedance adjustment circuit |
| PCT/CN2024/090903 WO2024239938A1 (en) | 2023-05-19 | 2024-04-30 | Adaptive adjustment impedance circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310575706.XA CN116566342B (en) | 2023-05-19 | 2023-05-19 | Adaptive impedance adjustment circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116566342A CN116566342A (en) | 2023-08-08 |
| CN116566342B true CN116566342B (en) | 2024-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310575706.XA Active CN116566342B (en) | 2023-05-19 | 2023-05-19 | Adaptive impedance adjustment circuit |
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| CN (1) | CN116566342B (en) |
| WO (1) | WO2024239938A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116566342B (en) * | 2023-05-19 | 2024-12-27 | 深圳飞骧科技股份有限公司 | Adaptive impedance adjustment circuit |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100565284B1 (en) * | 2003-07-30 | 2006-03-30 | 엘지전자 주식회사 | Transmission device of mobile communication terminal |
| KR20080035888A (en) * | 2006-10-20 | 2008-04-24 | 삼성전자주식회사 | Matching device of a mobile terminal |
| US7893763B2 (en) * | 2007-04-18 | 2011-02-22 | Onq Technology, Inc. | Apparatus and method for power added efficiency optimization of high amplification applications |
| JP4941553B2 (en) * | 2007-04-20 | 2012-05-30 | 富士通株式会社 | Amplifying device and method for controlling Doherty amplifier circuit |
| CN102347745A (en) * | 2010-08-04 | 2012-02-08 | 国基电子（上海）有限公司 | Adaptive impedance matching circuit |
| CN102664601A (en) * | 2012-04-05 | 2012-09-12 | 电子科技大学 | Self-adapting impedance matching module |
| CN202696585U (en) * | 2012-08-03 | 2013-01-23 | 宁波博一格数码科技有限公司 | Self-tuning impedance matching system |
| CN104123571B (en) * | 2013-04-23 | 2017-09-08 | 深圳市华士精成科技有限公司 | A kind of carrier cancellation circuit and RFID reader based on RFID reader |
| CN114465592A (en) * | 2021-12-30 | 2022-05-10 | 深圳半岛医疗有限公司 | Impedance adjusting method, radio frequency circuit and radio frequency power supply device |
| CN116566342B (en) * | 2023-05-19 | 2024-12-27 | 深圳飞骧科技股份有限公司 | Adaptive impedance adjustment circuit |
-
2023
- 2023-05-19 CN CN202310575706.XA patent/CN116566342B/en active Active
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2024
- 2024-04-30 WO PCT/CN2024/090903 patent/WO2024239938A1/en unknown
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| Publication number | Publication date |
|---|---|
| WO2024239938A1 (en) | 2024-11-28 |
| CN116566342A (en) | 2023-08-08 |
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