CN108900206A - A kind of impedance-matching device, impedance matching methods and communication terminal - Google Patents
A kind of impedance-matching device, impedance matching methods and communication terminal Download PDFInfo
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- CN108900206A CN108900206A CN201810725339.6A CN201810725339A CN108900206A CN 108900206 A CN108900206 A CN 108900206A CN 201810725339 A CN201810725339 A CN 201810725339A CN 108900206 A CN108900206 A CN 108900206A
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- 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
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- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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Abstract
The present invention relates to wireless communication technology field, in particular to a kind of impedance-matching device, impedance matching methods and communication terminal.Impedance-matching device of the embodiment of the present invention includes processing unit, impedance matching unit and load detecting unit；The input terminal of impedance matching unit and the output end of power amplifier connect, and the output end of the input terminal connection load detecting unit of output end and filter is connect with antenna；Load detecting unit is for detecting transmitting coupled signal and reflection coupling signal；Processing unit is used to determine that antenna environment loads according to transmitting coupled signal and reflection coupling signal, and determines that communication terminal is currently resident the corresponding predeterminated frequency section of channel；And determine that antenna environment loads matching impedance corresponding with predeterminated frequency section according to mapping relations；Set the impedance of impedance matching unit to the matching impedance determined.The launching target of communication terminal can be optimized, to improve the communication performance of communication terminal, reduce communication terminal power consumption.
Description
Technical field
The present invention relates to wireless communication technology field, in particular to a kind of impedance-matching device, impedance matching methods and logical
Believe terminal.
Background technique
With the development of communication technology, the communication terminals such as mobile phone, tablet computer are more and more common；It include day in communication terminal
Line, filter, power amplifier and match circuit, when match circuit is matched with antenna load, the performance of power amplifier is
Optimal, the communication performance of communication terminal is also best.
Currently, default antenna load is 50 Ω when match circuit impedance is arranged；It is matching electricity according to 50 Ω of antenna load
Optimal impedance is arranged in road, and based on the optimal impedance manufacture communication terminal and comes into operation；In communication terminal use process,
Impedance with circuit is fixed and invariable.However, communication terminal in use local environment when it is ever-changing, this causes
The antenna environment load of communication terminal changes constantly.When antenna environment loads and deviates 50 Ω, the resistance of match circuit at this time
Resist no longer with actual antenna environment load matched, will cause the power gain index of power amplifier and ACLR index can not
Control, influences the communication performance of communication terminal.
In conclusion the mode of setting match circuit impedance at present is unable to the impedance of flexible setting match circuit, influence to lead to
Believe the communication performance of terminal.
Summary of the invention
The present invention provides a kind of impedance-matching device, impedance matching methods and communication terminal, to solve in the prior art
The mode of existing current setting match circuit impedance is unable to the impedance of flexible setting match circuit, influences the communication of communication terminal
Performance obtains problem.
Based on the above issues, in a first aspect, the embodiment of the present invention provides a kind of impedance-matching device, it is applied to communication eventually
End, including processing unit, impedance matching unit and load detecting unit；The input terminal of the impedance matching unit and the communication
The output end of the power amplifier of terminal connects, the filter of the output end of the impedance matching unit and the communication terminal
Input terminal connection, the output end of the load detecting unit are connect with the antenna of the communication terminal；
The load detecting unit, for detecting transmitting coupled signal and reflection coupling signal, and described in will test
Transmitting coupled signal and the reflection coupling signal are exported to the processing unit；
The processing unit, for determining the communication eventually according to the transmitting coupled signal and the reflection coupling signal
The antenna environment at end loads, and determines that the communication terminal is currently resident the corresponding predeterminated frequency section of channel；And according to antenna
Environmental loads, predeterminated frequency section and matching impedance mapping relations, determine antenna environment load and the predeterminated frequency section
Corresponding matching impedance；Set the impedance of the impedance matching unit to the matching impedance determined.
Second aspect, a kind of method that the embodiment of the present invention provides impedance matching include：
Detection transmitting coupled signal and reflection coupling signal；
The antenna environment load of communication terminal is determined according to the transmitting coupled signal and the reflection coupling signal, and
Determine that the communication terminal is currently resident the corresponding predeterminated frequency section of channel；
According to antenna environment load, the mapping relations of predeterminated frequency section and matching impedance, the antenna environment load is determined
Matching impedance corresponding with the predeterminated frequency section；Set the impedance of impedance matching unit to the matching impedance determined.
The third aspect, the embodiment of the present invention provide a kind of communication terminal, power amplifier, filter, transceiver and as above
State impedance-matching device described in first aspect.
Since load detecting unit of the embodiment of the present invention can emit coupled signal and reflection coupling signal, place with real-time detection
Reason unit determines that real-time antenna environment loads according to the transmitting coupled signal and reflection coupling signal that detect, and processing is single
Member determines that communication terminal is currently resident the corresponding predeterminated frequency section of channel, and processing unit inquires antenna environment load, default frequency
The mapping relations of rate section and matching impedance, by the impedance of impedance matching unit be set as with current antenna environmental loads, communicate eventually
The end currently resident corresponding matched impedance of predeterminated frequency section of channel, can optimize the launching target of communication terminal, to improve
The communication performance of communication terminal reduces power consumption of terminal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of impedance-matching device of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of communication terminal of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the first load detecting unit of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of second of load detecting unit of the embodiment of the present invention；
Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 are the structural schematic diagram of L-type of embodiment of the present invention impedance matching network；
Figure 10 is the structural schematic diagram of π of embodiment of the present invention type impedance matching network；
Figure 11 is the structural schematic diagram of T-type of embodiment of the present invention impedance matching network；
Figure 12, Figure 13, Figure 14, Figure 15 are S11 of embodiment of the present invention parameter curve schematic diagram；
Figure 16 is the flow chart of impedance matching methods of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of impedance-matching device of the embodiment of the present invention includes processing unit 101, impedance matching unit
102, load detecting unit 103；
Wherein, the output end connection of the power amplifier 104 of the input terminal of impedance matching unit 102 and communication terminal, resistance
The input terminal of the filter 105 of the output end and communication terminal of anti-matching unit 102 connects；
The output end of load detecting unit 103 and the antenna 106 of communication terminal connect.
What needs to be explained here is that the impedance-matching device of the embodiment of the present invention can be set inside communication terminal, or
Person's impedance-matching device is external in communication terminal.
Below by built in impedance-matching device with communication terminal for be illustrated.
Communication terminal as shown in Figure 2, including：Processing unit 101, transceiver 107, power amplifier 104, filter
105, impedance matching unit 102, TX/RX (Transport/Receive, transmitting/reception) switch 108, load detecting unit
103, variable impedance 109, antenna 106, memory 110, peripheral circuit 111 and sensor unit 112 etc..
Wherein, for storing data, which is such as, but not limited to memory 110：Terminal recognition code, calibration parameter, day
Thread environment load, predeterminated frequency section and mapping relations of matching impedance etc.；
Peripheral circuit 111 may include liquid crystal display (Liquid Crystal Display, LCD) circuit, general string
Row bus (Universal Serial Bus, USB) circuit, power supply circuit of communication terminal etc.；
Sensor unit 112 may include range sensor, pressure sensor, temperature sensor etc.；Wherein, Distance-sensing
Device is used for detecting distance, and pressure sensor is for detecting pressure, and temperature sensor is for detecting temperature.
Communication terminal as shown in Figure 2, processing unit 101, transceiver 107, power amplifier 104, impedance matching unit
102, filter 105, TX/RX switch 108, load detecting unit 103, variable impedance 109 are sequentially connected, and variable impedance passes through day
Line mouth is connect with antenna 106；Impedance matching unit 102, load detecting unit 103, memory 110, peripheral circuit 111 and sensing
Device unit 112 is connect with processing unit 101 respectively；
Processing unit 101 can be adjusted the impedance of impedance matching unit 102, be detected according to load detecting unit
Transmitting coupled signal and reflection coupling signal determine communication terminal antenna environment load, load detecting unit can also be controlled
103, and the data stored in memory 110 can be read, Control peripheral circuit 111 and acquisition sensor unit 112 detect
The sensing data arrived.
It is put it should be noted that communication terminal of the embodiment of the present invention successively passes through processing unit 101, transceiver 107, power
Big device 104, impedance matching unit 102, filter 105, TX/RX switch 108, load detecting unit 103, variable impedance 109, day
The coupled signal of the radiation-emitting signal into environment of line 106, the detection transmitting signal of load detecting unit 103 obtains transmitting coupling letter
Number；The signal that load detecting unit 103 exports cannot be radiated in environment completely, and there are a part of signal reflexs to return load detecting
Unit 103 and antenna can receive useful signal to load detecting unit 103, the composition reflection of this two parts of signals from environment
The coupled signal of signal, 103 detected reflectance signal of load detecting unit obtains reflection coupling signal.
Optionally, as shown in figure 3, load detecting unit 103 includes power coupling module 1031 and signal receiving module
1032；
Power coupling module 1031, for detecting the transmitting coupled signal and the reflection coupling signal；
The signal transmitting and receiving module 1032, it is described for passing through the transmitting coupled signal and the reflection coupling signal
The transceiver of communication terminal is exported to the processing unit.
As shown in figure 4, the input terminal of power coupling module 1031 is defeated with filter 105 by TX/RX (transmitting-receiving) switch
Outlet connection, the first output end of power coupling module 1031 are connect with antenna 106；
Wherein, power coupling module 1031 includes input terminal 1, the first output end 2, second output terminal 3 and third output end
4；
Signal transmitting and receiving module 1032 includes the first controllable switch SW1 and the second controllable switch SW2；Specifically, first is controllable
Switch SW1 and the second controllable switch SW2 is single-pole double-throw switch (SPDT).
As shown in figure 4, the first controllable switch SW1 includes first terminal a, Second terminal b and third terminal c；First terminal a
It is connect with the second output terminal 3 of power coupling module 1031, Second terminal b is connect with transceiver 107, third terminal c ground connection.The
One controllable switch SW2 includes first terminal d, Second terminal e and third terminal f；First terminal d and power coupling module 1031
Third output end 4 connects, and Second terminal b is connect with transceiver 107, third terminal f ground connection.
The control terminal of signal transmitting and receiving module 1032 can be connect with processing unit 101, can by the control of processing unit 101 first
Control the state of switch SW1 and the second controllable switch SW2.For example, the first terminal a and second end of the first controllable switch SW1 of control
Sub- b connection, or the first terminal a of the first controllable switch SW1 of control are connected to third terminal c；Control the second controllable switch SW2's
First terminal d is connected to Second terminal e, or the first terminal d of the second controllable switch SW2 of control is connected to third terminal f.
What needs to be explained here is that there are two types of working conditions for the tool of signal transmitting and receiving module 1032.In first state, processing is single
The first terminal a that member 101 controls the first controllable switch SW1 is connected to Second terminal b, and the first of the second controllable switch SW2 of control
Terminal d is connected to third terminal f, and the third output end 4 of power coupling module 1031 is isolation end, signal transmitting and receiving module at this time
1032 export reflection coupling signal to processing unit 101.In the second state, processing unit 101 controls the second controllable switch
The first terminal d of SW2 is connected to Second terminal e, and the first terminal a of the first controllable switch SW1 of control is connected to third terminal c,
The second output terminal 3 of power coupling module 1031 is isolation end at this time, and signal transmitting and receiving module 1032 will emit coupled signal output
To processing unit 101.
During communication terminal work, the transmitting signal Sin that transceiver 107 emits successively passes through power amplifier
104, impedance matching unit 102, filter 105, TX/RX switch 108 are input to power coupling module 1031, especially by power
The first input end 1 of Coupler Module 1031 is inputted, and via the first output end 2 of power coupling module 1031, (port 2 is
Straight-through output end) it is output to the antenna 106 of communication terminal, antenna 106 is radiated signal Sin is emitted in surrounding space.But
In the process, it is influenced by antenna local environment, the impedance that antenna environment loads with the impedance matching circuit of communication terminal is deposited
In difference, and the difference is changed with the transformation of antenna local environment, this species diversity will lead to from power coupling module
The transmitting signal Sin of 1031 the first output end 2 output cannot be completely by aerial radiation into surrounding space, and there are a part of hairs
It penetrates signal and is reflected back power coupling module through the first output end 2 of overpower coupling module 1031, the signal being reflected back can
To be known as reflecting signal Sreflect.And communication terminal is during receiving signal, the antenna of communication terminal can be empty from around
Between middle reception useful signal and be input to power coupling module 1031, the useful signal of input power coupling module 1031 can claim
To receive signal Sreceive.
In embodiments of the present invention, the process of the detection of load detecting unit 103 transmitting coupled signal and reflection coupling signal
It can specifically can be as follows：In the course of work of communication terminal, processing unit 101 controls signal transmitting and receiving module 1032 periodically
Switch between the first state and a second state, when processing unit 101, which controls signal transmitting and receiving module 1032, is in first state,
The third output end 4 of power coupling module 1031 is isolation end, and power coupling module 1031 is anti-to inputting from the first output end 2
It penetrates signal Sreflect and receives signal Sreceive and coupled to obtain reflection coupling signal Sco-re, and pass through signal transmitting and receiving
First controllable switch of module 1032 is output to transceiver 107, by transceiver 107 by reflection coupling signal Sco-re export to
Manage unit 101.When processing unit 101, which controls signal transmitting and receiving module 1032, is in the second state, power coupling module 1031
Second output terminal 3 is isolation end, and power coupling module 1031 couples the transmitting signal Sin inputted from first input end 1
Transmitting coupled signal Sco-in is obtained, and transceiver 107 is output to by the second controllable switch of signal transmitting and receiving module 1032, by
Transceiver 107 is exported coupled signal Sco-in is emitted to processing unit 101.
Processing unit 101 determines that the antenna environment of communication terminal loads according to transmitting coupled signal and reflection coupling signal；
Specifically, processing unit 101 detects the first amplitude and first phase of the transmitting coupled signal, and the detection reflection coupling
Close the second amplitude and second phase of signal；According to the first amplitude, the first phase, second amplitude and described
Two phase determines the signal reflex coefficient；The communication terminal is determined according to the signal reflex coefficient and default load
Antenna environment load.
Processing unit 101 can determine the antenna environment load of communication terminal using following company：
Wherein, ZloadIt is loaded for the antenna environment of communication terminal, Z0For default load, τ is signal reflex coefficient；
Optionally, Z0Value be 50 Ω.
It should be noted that in embodiments of the present invention, reflection coupling signal Sco-re is actually power coupling module
The combining signal of reflection signal Sreflect and reception signal Sreceive are coupled, but due to reflecting signal
The intensity of Sreflect is far longer than the intensity for receiving signal Sreceive, connects to can ignore in coupled signal calculating process
Collection of letters Sreceive, the intensity of coupled signal can only have to be determined by reflection signal Sreflect, therefore, will be to reflection signal
The coupled signal that Sreflect and the combining signal for receiving signal Sreceive obtain is known as reflection coupling signal Sco-re, this hair
Bright embodiment is not construed as limiting this.
It is stored with preset features table in the memory 110 of communication terminal of the embodiment of the present invention, which uses
In the mapping relations for indicating antenna environment load, predeterminated frequency section and matching impedance.
Wherein, predeterminated frequency section is multiple frequency bands divided in advance；For example, by frequency range f0~fnIt is divided into n in advance
If frequency band, respectively：f0~f1、f1~f2、f2~f3……fn-1~fn。
Processing unit 101 is for determining that communication terminal is currently resident the corresponding predeterminated frequency section of channel；
Specifically, judge communication terminal currently be resident channel frequency range in whether include predeterminated frequency section boundary
Point；If it is not, it is corresponding to be currently resident channel as communication terminal for predeterminated frequency section belonging to the frequency range of current resident channel
Predeterminated frequency section；If so, by predeterminated frequency section belonging to the frequency range of the adjacent channel of current resident channel, as logical
Believe that terminal is currently resident the corresponding predeterminated frequency section of channel.
It is preset that is, communication terminal of the embodiment of the present invention is currently resident not including in the corresponding predeterminated frequency section of channel
The separation of frequency band.
For example, the working channel of terminal includes channel 1, channel 2, channel 3, channel 4, channel 5, channel 6, channel 7, channel
8, channel 9, channel 10, channel 10, channel 11, channel 12, channel 13；If it is channel 8 that terminal, which is currently resident channel,；It is logical determining
Point when believing that terminal is currently resident the corresponding predeterminated frequency section of channel, in the frequency range of channel 8 not comprising predeterminated frequency section
When boundary's point, the corresponding default frequency of channel is currently resident using predeterminated frequency section belonging to the frequency range of channel 8 as communication terminal
Rate section；In channel 8 include predeterminated frequency section separation when, by predeterminated frequency belonging to the frequency range of channel 7 or channel 9
Duan Zuowei communication terminal is currently resident the corresponding predeterminated frequency section of channel 8.
For example, the frequency range that communication terminal is currently resident channel is 826.250MHz~828.125MHz, and
827.125MHz is f0~f1And f1~f2The separation of predeterminated frequency section, i.e. f1=827.125MHz；Then selection is resident with current
The adjacent subsequent channels of channel, it is assumed that the frequency range of subsequent channels is 827.250MHz~829.125MHz, and the frequency model
The separation for not including predeterminated frequency section in enclosing, then be 827.250MHz~829.125MHz institute by the frequency range of subsequent channels
Predeterminated frequency section 827.125MHz~830.250MHz as communication terminal currently be resident the corresponding predeterminated frequency section of channel.
In the mapping relations of antenna environment load, predeterminated frequency section and matching impedance, matching impedance includes impedance matching list
The impedance of adjustment circuit and the impedance of series control circuit in parallel in member.For example, impedance matching unit can be shunt capacitance-string
Join capacity type, shunt capacitance-series inductance type, shunt inductance-series capacitance type, shunt capacitance-series capacitance type,
Shunt capacitance-series capacitance-shunt capacitance type, shunt capacitance-series inductance-shunt inductance type etc., the embodiment of the present invention
This is not construed as limiting.
What needs to be explained here is that being stored in memory pre- in the circuit types difference that impedance matching unit is selected
Set that characterization table is also different, i.e. the mapping relations of antenna environment load, predeterminated frequency section and matching impedance are different.
The optional impedance matching unit of the embodiment of the present invention is first introduced below：
Type one, L-type impedance matching network.
Optionally, impedance matching unit 102 includes the first adjustment circuit 1021 in parallel and the first series control circuit 1022；
One end of described first adjustment circuit 1021 in parallel is connect with the output end of power amplifier 104, other end ground connection；Described first
One end of series control circuit 1022 is connect with the output end of the power amplifier 104, the other end and the filter 105
Input terminal connection.
As shown in figure 5, the input terminal of impedance matching unit 102 is SL1, output end SL2；Input terminal SL1 is put with power
The output end connection of big device 104, output end SL2 are connect with the input terminal of filter 105.
First adjustment circuit 1021 in parallel includes：First single-pole double-throw switch (SPDT) SW21, first capacitor array C1 and the first electricity
Feel array；The capacitance of first capacitor array C1 and the inductance value of the first electric inductance array can adjust.First capacitor array C1
Specific structure can refer to the prior art, as shown in figure 5, the first electric inductance array includes：First single-pole three-throw switch SW31,
Two single-pole three-throw switch SW32 and three the first inductance being sequentially connected in series, three first inductance being sequentially connected in series may include
First inductance L11, the first inductance L12 and the first inductance L13, the first inductance L11, the first inductance L12 and the first inductance L13 head and the tail
It is sequentially connected；Wherein, the second end of the first inductance L11 is connect with the first end of the first inductance L12, and the second of the first inductance L12
End is connect with the first end of the first inductance L13.
Specifically, the first terminal a21 of the first single-pole double-throw switch (SPDT) SW21 and the input terminal of impedance matching unit 102 are
SL1 connection, the first terminal a31 of the Second terminal b21 of the first single-pole double-throw switch (SPDT) SW21 and the first single-pole three-throw switch SW31
Connection, the third terminal c21 of the first single-pole double-throw switch (SPDT) SW21 are connect with one end of first capacitor array C1；First capacitor array
The other end of C1 is grounded.
The Second terminal b31 of first single-pole three-throw switch SW31 is connect with the first end of the first inductance L11, third terminal
C31 is connect with the first end of the first inductance L12, and forth terminal d31 is connect with the first end of the first inductance L13；Second hilted broadsword three
The first terminal a32 of throw switch SW32 is grounded, and Second terminal b32 is connect with the first end of the first inductance L12, third terminal c32
It is connect with the first end of the first inductance L13, forth terminal d32 is connect with the second end of the first inductance L13.
First series control circuit 1022 includes：Second single-pole double-throw switch (SPDT) SW22, the second capacitor array C2 and the second electricity
Feel array；The capacitance of second capacitor array C2 and the inductance value of the second electric inductance array can adjust.Second capacitor array C2
Specific structure can refer to the prior art, as shown in figure 5, the second electric inductance array includes：Third single-pole three-throw switch SW33,
Four single-pole three-throw switch SW34 and three the second inductance being sequentially connected in series, three second inductance being sequentially connected in series may include
Second inductance L21, the second inductance L22 and the second inductance L23, the second inductance L21, the second inductance L22 and the second inductance L23 head and the tail
It is sequentially connected；Wherein, the second end of the second inductance L21 is connect with the first end of the second inductance L22, and the second of the second inductance L22
End is connect with the first end of the second inductance L23.
Specifically, the first terminal a22 of the second single-pole double-throw switch (SPDT) SW22 and the input terminal of impedance matching unit 102 are
SL1 connection, the first terminal a33 of the Second terminal b22 and third single-pole three-throw switch SW33 of the second single-pole double-throw switch (SPDT) SW22
Connection, the third terminal c22 of the second single-pole double-throw switch (SPDT) SW22 are connect with one end of the second capacitor array C2；Second capacitor array
C2 is that SL2 is connect with the output end of impedance matching unit 102.
The Second terminal b33 of third single-pole three-throw switch SW33 is connect with the first end of the second inductance L21, third terminal
C33 is connect with the first end of the second inductance L22, and forth terminal d33 is connect with the first end of the second inductance L23；4th hilted broadsword three
The first terminal a34 of throw switch SW34 is that SL2 is connect with the output end of impedance matching unit 102, the electricity of Second terminal b34 and second
Feel the first end connection of L22, third terminal c34 is connect with the first end of the second inductance L23, forth terminal d34 and the second inductance
The second end of L23 connects.
It should be noted that processing unit 101 controls the first single-pole double-throw switch (SPDT) SW21 by control line CL21；
Processing unit 101 controls the first single-pole three-throw switch SW31 by control line CL311, CL312；Processing unit 101 is logical
Control line CL321, CL322 is crossed to control the second single-pole three-throw switch SW32；Processing unit 101 passes through CL22 pairs of control line
Second single-pole double-throw switch (SPDT) SW22 is controlled；Processing unit 101 opens third single-pole three throw by control line CL331, CL332
SW33 is closed to be controlled；Processing unit 101 controls the 4th single-pole three-throw switch SW34 by control line CL341, CL342
System.
For example, when processing unit 101 controls the first terminal a21 and third terminal c21 of the first single-pole double-throw switch (SPDT) SW21
Connection, impedance matching network such as Fig. 6 when the first terminal a22 of the second single-pole double-throw switch (SPDT) SW22 is connected to third terminal c22
It is shown.
When processing unit 101 control the first single-pole double-throw switch (SPDT) SW21 first terminal a21 be connected to third terminal c21,
Impedance matching network when the first terminal a22 of second single-pole double-throw switch (SPDT) SW22 is connected to Second terminal b22 is as shown in Figure 7.
When processing unit 101 control the first single-pole double-throw switch (SPDT) SW21 first terminal a21 be connected to Second terminal b21,
Impedance matching network when the first terminal a22 of second single-pole double-throw switch (SPDT) SW22 is connected to third terminal c22 is as shown in Figure 8.
When processing unit 101 control the first single-pole double-throw switch (SPDT) SW21 first terminal a21 be connected to Second terminal b21,
Impedance matching network when the first terminal a22 of second single-pole double-throw switch (SPDT) SW22 is connected to Second terminal b22 is as shown in Figure 9.
When using L-type impedance matching network, indicate that the mapping of antenna environment load, predeterminated frequency section and matching impedance is closed
The preset features table of system can be as shown in table 1.
Table 1
It, can be in practical application, in preset features table it should be noted that above-mentioned table 1 was merely illustrative
The SOT state of termination of recording communication terminal, at this point, communication terminal can also be obtained when processing unit 101 inquires preset features table
The SOT state of termination.For example, preset features table can also be as shown in table 2 below：
Table 2
Type two, π type impedance matching network.
Impedance matching unit includes the second adjustment circuit, the second series control circuit and third parallel connection adjustment circuit in parallel；
One end of described second adjustment circuit in parallel is connect with the output end of the power amplifier, other end ground connection；Second series connection is adjusted
Whole circuit is connect with the output end of the power amplifier, the other end one end of adjustment circuit in parallel with the third, institute respectively
State the input terminal connection of filter；One end of the third parallel connection adjustment circuit is connect with the input terminal of the filter, another
End ground connection.
As shown in Figure 10, the input terminal of impedance matching unit 102 be SL1, output end SL2；Input terminal SL1 is put with power
The output end connection of big device 104, output end SL2 are connect with the input terminal of filter 105.
Second adjustment circuit 1023 in parallel includes：First single-pole double-throw switch (SPDT) SW21, first capacitor array C1 and the first electricity
Feel array；The capacitance of first capacitor array C1 and the inductance value of the first electric inductance array can adjust.First capacitor array C1
Specific structure can refer to the prior art, as shown in Figure 10, the first electric inductance array includes：First single-pole three-throw switch SW31,
Second single-pole three-throw switch SW32 and three the first inductance being sequentially connected in series, three first inductance being sequentially connected in series can wrap
It includes the first inductance L11, the first inductance L12 and the first inductance L13, the first inductance L11, the first inductance L12 and the first inductance L13 is first
Tail is sequentially connected；Wherein, the second end of the first inductance L11 is connect with the first end of the first inductance L12, and the of the first inductance L12
Two ends are connect with the first end of the first inductance L13.
Specifically, the first terminal a21 of the first single-pole double-throw switch (SPDT) SW21 and the input terminal of impedance matching unit 102 are
SL1 connection, the first terminal a31 of the Second terminal b21 of the first single-pole double-throw switch (SPDT) SW21 and the first single-pole three-throw switch SW31
Connection, the third terminal c21 of the first single-pole double-throw switch (SPDT) SW21 are connect with one end of first capacitor array C1；First capacitor array
The other end of C1 is grounded.
The Second terminal b31 of first single-pole three-throw switch SW31 is connect with the first end of the first inductance L11, third terminal
C31 is connect with the first end of the first inductance L12, and forth terminal d31 is connect with the first end of the first inductance L13；Second hilted broadsword three
The first terminal a32 of throw switch SW32 is grounded, and Second terminal b32 is connect with the first end of the first inductance L12, third terminal c32
It is connect with the first end of the first inductance L13, forth terminal d32 is connect with the second end of the first inductance L13.
Second series control circuit 1024 includes：Second single-pole double-throw switch (SPDT) SW22, the second capacitor array C2 and the second electricity
Feel array；The capacitance of second capacitor array C2 and the inductance value of the second electric inductance array can adjust.Second capacitor array C2
Specific structure can refer to the prior art, as shown in figure 5, the second electric inductance array includes：Third single-pole three-throw switch SW33,
Four single-pole three-throw switch SW34 and three the second inductance being sequentially connected in series, three second inductance being sequentially connected in series may include
Second inductance L21, the second inductance L22 and the second inductance L23, the second inductance L21, the second inductance L22 and the second inductance L23 head and the tail
It is sequentially connected；Wherein, the second end of the second inductance L21 is connect with the first end of the second inductance L22, and the second of the second inductance L22
End is connect with the first end of the second inductance L23.
Specifically, the first terminal a22 of the second single-pole double-throw switch (SPDT) SW22 and the input terminal of impedance matching unit 102 are
SL1 connection, the first terminal a33 of the Second terminal b22 and third single-pole three-throw switch SW33 of the second single-pole double-throw switch (SPDT) SW22
Connection, the third terminal c22 of the second single-pole double-throw switch (SPDT) SW22 are connect with one end of the second capacitor array C2；Second capacitor array
The other end of C2 the first terminal a23 of third single-pole double-throw switch (SPDT) SW23, impedance in adjustment circuit 1025 in parallel with third respectively
The output end of matching unit 102 is SL2 connection.
The Second terminal b33 of third single-pole three-throw switch SW33 is connect with the first end of the second inductance L21, third terminal
C33 is connect with the first end of the second inductance L22, and forth terminal d33 is connect with the first end of the second inductance L23；4th hilted broadsword three
The Second terminal b34 of throw switch SW34 is connect with the first end of the second inductance L22, and the of third terminal c34 and the second inductance L23
One end connection, forth terminal d34 are connect with the second end of the second inductance L23, and adjustment in parallel with third is electric respectively by first terminal a34
The first terminal a23 of third single-pole double-throw switch (SPDT) SW23 in road 1025, impedance matching unit 102 output end be SL2 connection.
Third parallel connection adjustment circuit 1025 includes：Third single-pole double-throw switch (SPDT) SW23, third capacitor array C3 and third electricity
Feel array；The capacitance of third capacitor array C3 and the inductance value of third electric inductance array can adjust.Third capacitor array C3
Specific structure can refer to the prior art, as shown in Figure 10, third electric inductance array includes：5th single-pole three-throw switch SW35,
6th single-pole three-throw switch SW36 and three third inductance being sequentially connected in series, three third inductance being sequentially connected in series can wrap
Third inductance L31, third inductance L32 and third inductance L33 are included, third inductance L31, third inductance L32 and third inductance L33 are first
Tail is sequentially connected；Wherein, the second end of third inductance L31 is connect with the first end of third inductance L32, and the of third inductance L32
Two ends are connect with the first end of third inductance L33.
Specifically, the first terminal a23 of third single-pole double-throw switch (SPDT) SW23 is with the input outlet of impedance matching unit 102
SL2 connection, the first terminal a35 of the Second terminal b23 and the 5th single-pole three-throw switch SW35 of third single-pole double-throw switch (SPDT) SW23
Connection, the third terminal c23 of third single-pole double-throw switch (SPDT) SW23 are connect with one end of third capacitor array C3；Third capacitor array
The other end of C3 is grounded.
The Second terminal b35 of 5th single-pole three-throw switch SW35 is connect with the first end of third inductance L31, third terminal
C35 is connect with the first end of third inductance L32, and forth terminal d35 is connect with the first end of third inductance L33；6th hilted broadsword three
The first terminal a36 of throw switch SW36 is grounded, and Second terminal b36 is connect with the first end of third inductance L32, third terminal c36
It is connect with the first end of third inductance L33, forth terminal d36 is connect with the second end of third inductance L33.
It should be noted that processing unit 101 controls the first single-pole double-throw switch (SPDT) SW21 by control line CL21；
Processing unit 101 controls the first single-pole three-throw switch SW31 by control line CL311, CL312；Processing unit 101 is logical
Control line CL321, CL322 is crossed to control the second single-pole three-throw switch SW32；Processing unit 101 passes through CL22 pairs of control line
Second single-pole double-throw switch (SPDT) SW22 is controlled；Processing unit 101 opens third single-pole three throw by control line CL331, CL332
SW33 is closed to be controlled；Processing unit 101 controls the 4th single-pole three-throw switch SW34 by control line CL341, CL342
System；Processing unit 101 controls third single-pole double-throw switch (SPDT) SW23 by control line CL23；Processing unit 101 passes through control
Line CL351, CL352 processed control the 5th single-pole three-throw switch SW35；Processing unit 101 by control line CL361,
CL362 controls the 6th single-pole three-throw switch SW36.
Type three, T-type impedance matching network.
Impedance matching unit 102 includes the adjustment circuit 1027 in parallel of third series control circuit the 1026, the 4th and the 4th string
Join adjustment circuit 1028；One end of the third series control circuit 1026 is connect with the output end of the power amplifier 104,
The other end respectively one end of adjustment circuit 1027 in parallel with the described 4th, the 4th series control circuit 1028 one end connect
It connects；The other end ground connection of described 4th adjustment circuit 1027 in parallel；The other end of 4th series control circuit 1028 and institute
State the input terminal connection of filter 105.
As shown in figure 11, the input terminal of impedance matching unit 102 be SL1, output end SL2；Input terminal SL1 is put with power
The output end connection of big device 104, output end SL2 are connect with the input terminal of filter 105.
Third series control circuit 1026 includes：First single-pole double-throw switch (SPDT) SW21, first capacitor array C1 and the first electricity
Feel array；The capacitance of first capacitor array C1 and the inductance value of the first electric inductance array can adjust.First capacitor array C1
Specific structure can refer to the prior art, as shown in figure 11, the first electric inductance array includes：First single-pole three-throw switch SW31,
Second single-pole three-throw switch SW32 and three the first inductance being sequentially connected in series, three first inductance being sequentially connected in series can wrap
It includes the first inductance L11, the first inductance L12 and the first inductance L13, the first inductance L11, the first inductance L12 and the first inductance L13 is first
Tail is sequentially connected；Wherein, the second end of the first inductance L11 is connect with the first end of the first inductance L12, and the of the first inductance L12
Two ends are connect with the first end of the first inductance L13.
Specifically, the first terminal a21 of the first single-pole double-throw switch (SPDT) SW21 and the input terminal of impedance matching unit 102 are
SL1 connection, the first terminal a31 of the Second terminal b21 of the first single-pole double-throw switch (SPDT) SW21 and the first single-pole three-throw switch SW31
Connection, the third terminal c21 of the first single-pole double-throw switch (SPDT) SW21 are connect with one end of first capacitor array C1；First capacitor array
The other end of C1 the first terminal a22 of the second single-pole double-throw switch (SPDT) SW22, the 4th in adjustment circuit 1027 in parallel with the 4th respectively
The first terminal a23 connection of third single-pole double-throw switch (SPDT) SW23 in series control circuit 1028.
The Second terminal b31 of first single-pole three-throw switch SW31 is connect with the first end of the first inductance L11, third terminal
C31 is connect with the first end of the first inductance L12, and forth terminal d31 is connect with the first end of the first inductance L13；Second hilted broadsword three
The Second terminal b32 of throw switch SW32 is connect with the first end of the first inductance L12, and the of third terminal c32 and the first inductance L13
One end connection, forth terminal d32 are connect with the second end of the first inductance L13, and adjustment in parallel with the 4th is electric respectively by first terminal a32
The first terminal a22 of second single-pole double-throw switch (SPDT) SW22 in road 1027, third single-pole double throw in the 4th series control circuit 1028
The first terminal a23 connection of switch SW23.
4th adjustment circuit 1027 in parallel includes：Second single-pole double-throw switch (SPDT) SW22, the second capacitor array C2 and the second electricity
Feel array；The capacitance of second capacitor array C2 and the inductance value of the second electric inductance array can adjust.Second capacitor array C2
Specific structure can refer to the prior art, as shown in figure 11, the second electric inductance array includes：Third single-pole three-throw switch SW33,
4th single-pole three-throw switch SW34 and three the second inductance being sequentially connected in series, three second inductance being sequentially connected in series can wrap
It includes the second inductance L21, the second inductance L22 and the second inductance L23, the second inductance L21, the second inductance L22 and the second inductance L23 is first
Tail is sequentially connected；Wherein, the second end of the second inductance L21 is connect with the first end of the second inductance L22, and the of the second inductance L22
Two ends are connect with the first end of the second inductance L23.
Specifically, the output of the first terminal a22 of the second single-pole double-throw switch (SPDT) SW22 and third series control circuit 1026
The first terminal a33 of end connection, the Second terminal b22 and third single-pole three-throw switch SW33 of the second single-pole double-throw switch (SPDT) SW22 connects
It connects, the third terminal c22 of the second single-pole double-throw switch (SPDT) SW22 is connect with one end of the second capacitor array C2, the second capacitor array C2
The other end ground connection.
The Second terminal b33 of third single-pole three-throw switch SW33 is connect with the first end of the second inductance L21, third terminal
C33 is connect with the first end of the second inductance L22, and forth terminal d33 is connect with the first end of the second inductance L23；4th hilted broadsword three
The Second terminal b34 of throw switch SW34 is connect with the first end of the second inductance L22, and the of third terminal c34 and the second inductance L23
One end connection, forth terminal d34 are connect with the second end of the second inductance L23, first terminal a34 ground connection.
4th series control circuit 1028 includes：Third single-pole double-throw switch (SPDT) SW23, third capacitor array C3 and third electricity
Feel array；The capacitance of third capacitor array C3 and the inductance value of third electric inductance array can adjust.Third capacitor array C3
Specific structure can refer to the prior art, as shown in figure 11, third electric inductance array includes：5th single-pole three-throw switch SW35,
6th single-pole three-throw switch SW36 and three third inductance being sequentially connected in series, three third inductance being sequentially connected in series can wrap
Third inductance L31, third inductance L32 and third inductance L33 are included, third inductance L31, third inductance L32 and third inductance L33 are first
Tail is sequentially connected；Wherein, the second end of third inductance L31 is connect with the first end of third inductance L32, and the of third inductance L32
Two ends are connect with the first end of third inductance L33.
Specifically, the output of the first terminal a23 of third single-pole double-throw switch (SPDT) SW23 and third series control circuit 1026
The first terminal a35 of end connection, the Second terminal b23 and the 5th single-pole three-throw switch SW35 of third single-pole double-throw switch (SPDT) SW23 connects
It connects, the third terminal c23 of third single-pole double-throw switch (SPDT) SW23 is connect with one end of third capacitor array C3；Third capacitor array C3
The other end and the output end of impedance matching unit 102 be that SL2 is connect.
The Second terminal b35 of 5th single-pole three-throw switch SW35 is connect with the first end of third inductance L31, third terminal
C35 is connect with the first end of third inductance L32, and forth terminal d35 is connect with the first end of third inductance L33；6th hilted broadsword three
The first terminal a36 of throw switch SW36 is that SL2 is connect with the output end of impedance matching unit 102, Second terminal b36 and third electricity
Feel the first end connection of L32, third terminal c36 is connect with the first end of third inductance L33, forth terminal d36 and third inductance
The second end of L33 connects.
It should be noted that processing unit 101 controls the first single-pole double-throw switch (SPDT) SW21 by control line CL21；
Processing unit 101 controls the first single-pole three-throw switch SW31 by control line CL311, CL312；Processing unit 101 is logical
Control line CL321, CL322 is crossed to control the second single-pole three-throw switch SW32；Processing unit 101 passes through CL22 pairs of control line
Second single-pole double-throw switch (SPDT) SW22 is controlled；Processing unit 101 opens third single-pole three throw by control line CL331, CL332
SW33 is closed to be controlled；Processing unit 101 controls the 4th single-pole three-throw switch SW34 by control line CL341, CL342
System；Processing unit 101 controls third single-pole double-throw switch (SPDT) SW23 by control line CL23；Processing unit 101 passes through control
Line CL351, CL352 processed control the 5th single-pole three-throw switch SW35；Processing unit 101 by control line CL361,
CL362 controls the 6th single-pole three-throw switch SW36.
With reference to the accompanying drawing 12~15, illustrate S11 parameter curve after the impedance-matching device using the embodiment of the present invention
Effect picture.
When communication terminal is in free space state, the antenna environment load of communication terminal is 50 ohm, impedance matching electricity
The impedance on road is initial matching impedance, and impedance matching circuit default matching, the impedance of impedance matching circuit can be shunt inductance
L11, series capacitance C21, at this point, the S11 parameter curve of filter is as shown in figure 12, referring to Figure 12, S11 parameter curve is located at history
This close circle diagram center and circle surrounded is smaller, at this point, S11 parameter curve preferably converges on 50 ohm of Smith chart center
Place, the better astringency of S11 parameter curve.When antenna environment load variation is Z1, by above-mentioned table 2 it is found that communication at this time is whole
End is in handheld state, if the impedance of impedance matching circuit at this time is still initial matching impedance, the S11 parameter curve of filter
Can be as shown in figure 13, referring to Figure 13, the circle that S11 parameter curve surrounds is larger, at this point, S11 parameter curve can not converge on history
At 50 ohm of the center of this close circle diagram, the convergence of S11 parameter curve is poor, and such case will lead to the transmitting phase of communication terminal
Close performance indicator severe exacerbation.
In embodiments of the present invention, load detecting unit can emit coupled signal and reflection coupling signal with real-time detection,
And determine that the corresponding predeterminated frequency section of channel is currently resident in real-time antenna environment load and communication terminal by processing unit,
It is Z1 when load acquiring unit gets antenna environment load, it is f that communication terminal, which is currently resident the corresponding predeterminated frequency section of channel,1
~f2When, processing unit can inquire preset features table (for example, the load of the antenna environment as shown in table 1 or table 2, default frequency
The mapping relations of rate section and matching impedance), by the impedance of impedance matching unit be set as with current antenna environmental loads, communicate eventually
The end currently resident corresponding matched impedance of predeterminated frequency section of channel, guarantees that communication terminal is currently resident the corresponding default frequency of channel
Rate section is f1~f2When, the S11 parameter under Z1 is loaded at 50 ohm of the center of Smith chart in antenna environment.
For example, predeterminated frequency section includes f0~f1、f1~f2、f2~f3、f3~f4、f4~f5、f5~f6、f6~f7、f7~
f8；As shown in figure 14, S11 parameter curve is divided into 8 sections；It is in handheld state in communication terminal, antenna environment load is Z1, if this
When impedance matching circuit impedance be still initial matching impedance, then the S11 parameter curve of filter may refer to Figure 14, S11 ginseng
The circle that number curve surrounds is larger；Currently being resident the corresponding predeterminated frequency section of channel in communication terminal is f5~f6(827.125MHz~
When 830.250MHz), set the impedance of impedance matching unit to be currently resident letter with current antenna environmental loads, communication terminal
The corresponding matched impedance of predeterminated frequency section in road, then S11 parameter curve is as shown in figure 15 after adjusting, the 6th section of (f5~f6Default frequency
Rate section) curve at 50 ohm of the center of Smith chart, to optimize the emitting performance of communication terminal and reduce logical
Believe the power consumption of terminal.
Based on the same inventive concept, a kind of method of impedance matching is additionally provided in the embodiment of the present invention, due to this method
Corresponding executing subject is the impedance-matching device in the embodiment of the present invention, therefore the implementation of this method may refer to impedance matching
The implementation of device, overlaps will not be repeated.
As shown in figure 16, a kind of method of impedance matching of the embodiment of the present invention includes：
Step 1601, detection transmitting coupled signal and reflection coupling signal；
Step 1602, the antenna environment that communication terminal is determined according to the transmitting coupled signal and the reflection coupling signal
Load, and determine that the communication terminal is currently resident the corresponding predeterminated frequency section of channel；
Step 1603 loads, the mapping relations of predeterminated frequency section and matching impedance according to antenna environment, determines the antenna
Environmental loads and the corresponding matching impedance of the predeterminated frequency section；Set the impedance of impedance matching unit to the matching determined
Impedance.
Optionally, the determination communication terminal is currently resident the corresponding predeterminated frequency section of channel, including：
Judge the communication terminal currently be resident channel frequency range in whether include predeterminated frequency section separation；
If it is not, predeterminated frequency section belonging to the frequency range of current resident channel is currently stayed as the communication terminal
Stay the corresponding predeterminated frequency section of channel；
If so, by predeterminated frequency section belonging to the frequency range of the adjacent channel of current resident channel, as described logical
Believe that terminal is currently resident the corresponding predeterminated frequency section of channel.
Optionally, the antenna loop that communication terminal is determined according to the transmitting coupled signal and the reflection coupling signal
Border load, including：
Detect the first amplitude and first phase of the transmitting coupled signal, and the detection reflection coupling signal the
Two amplitudes and second phase；
According to the first amplitude, the first phase, second amplitude and the second phase, the signal is determined
Reflection coefficient；
The antenna environment load of the communication terminal is determined according to the signal reflex coefficient and default load.
The embodiment of the present invention also provides a kind of communication terminal, including power amplifier, filter, transceiver and described above
Impedance-matching device.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of impedance-matching device, which is characterized in that be applied to communication terminal, including processing unit, impedance matching unit and
Load detecting unit；The input terminal of the impedance matching unit is connect with the output end of the power amplifier of the communication terminal,
The output end of the impedance matching unit is connect with the input terminal of the filter of the communication terminal, the load detecting unit
Output end is connect with the antenna of the communication terminal；
The load detecting unit, for detecting transmitting coupled signal and reflection coupling signal, and the transmitting that will test
Coupled signal and the reflection coupling signal are exported to the processing unit；
The processing unit, for determining the communication terminal according to the transmitting coupled signal and the reflection coupling signal
Antenna environment load, and determine that the communication terminal is currently resident the corresponding predeterminated frequency section of channel；And according to antenna environment
It loads, the mapping relations of predeterminated frequency section and matching impedance, determines that the antenna environment load is corresponding with the predeterminated frequency section
Matching impedance；Set the impedance of the impedance matching unit to the matching impedance determined.
2. impedance-matching device as described in claim 1, which is characterized in that the processing unit is specifically used for：
Judge the communication terminal currently be resident channel frequency range in whether include predeterminated frequency section separation；If it is not,
By predeterminated frequency section belonging to the frequency range of current resident channel, it is corresponding pre- that channel is currently resident as the communication terminal
If frequency band；If so, by predeterminated frequency section belonging to the frequency range of the adjacent channel of current resident channel, as described logical
Believe that terminal is currently resident the corresponding predeterminated frequency section of channel.
3. impedance-matching device as described in claim 1, which is characterized in that the load detecting unit includes power coupled mode
Block and signal receiving module；
The power coupling module, for detecting the transmitting coupled signal and the reflection coupling signal；
The signal transmitting and receiving module, for the transmitting coupled signal and the reflection coupling signal to be passed through the communication terminal
Transceiver export to the processing unit.
4. impedance-matching device as claimed in claim 3, which is characterized in that the input terminal of the power coupling module passes through receipts
Hair switch is connect with the output end of the filter of the communication terminal, and the first output end of the power coupling module leads to described
Believe the antenna connection of terminal；
The signal transmitting and receiving module includes the first controllable switch and the second controllable switch；The first terminal of first controllable switch
It is connect with the second output terminal of the power coupling module, the Second terminal of first controllable switch passes through the communication terminal
Transceiver connect with the processing unit；The third of the first terminal of second controllable switch and the power coupling module
The Second terminal of output end connection, second controllable switch is connected by the transceiver of the communication terminal and the processing unit
It connects；
When the first terminal of first controllable switch is connected to Second terminal, the signal transmitting and receiving module is by the reflection coupling
Signal is closed to export to the processing unit；When the first terminal of second controllable switch is connected to Second terminal, the letter
Number transceiver module exports the transmitting coupled signal to the processing unit.
5. impedance-matching device as described in claim 1, which is characterized in that the processing unit is specifically used for：
Detect the first amplitude and first phase of the transmitting coupled signal, and the second width of the detection reflection coupling signal
Value and second phase；According to the first amplitude, the first phase, second amplitude and the second phase, institute is determined
State signal reflex coefficient；The antenna environment load of the communication terminal is determined according to the signal reflex coefficient and default load.
6. impedance-matching device as described in claim 1, which is characterized in that
The impedance matching unit includes the first adjustment circuit in parallel and the first series control circuit；Described first adjustment electricity in parallel
The one end on road is connect with the output end of the power amplifier, other end ground connection；One end of first series control circuit with
The output end of the power amplifier connects, and the other end is connect with the input terminal of the filter；Or
The impedance matching unit includes the second adjustment circuit, the second series control circuit and third parallel connection adjustment circuit in parallel；
One end of described second adjustment circuit in parallel is connect with the output end of the power amplifier, other end ground connection；Second series connection is adjusted
Whole circuit is connect with the output end of the power amplifier, the other end one end of adjustment circuit in parallel with the third, institute respectively
State the input terminal connection of filter；One end of the third parallel connection adjustment circuit is connect with the input terminal of the filter, another
End ground connection；Or
The impedance matching unit includes third series control circuit, the 4th adjustment circuit in parallel and the 4th series control circuit；
One end of the third series control circuit is connect with the output end of the power amplifier, the other end respectively with the described 4th simultaneously
Join one end of adjustment circuit, one end connection of the 4th series control circuit；The other end of described 4th adjustment circuit in parallel
Ground connection；The other end of 4th series control circuit is connect with the input terminal of the filter.
7. a kind of method of impedance matching, which is characterized in that including：
Detection transmitting coupled signal and reflection coupling signal；
The antenna environment load of communication terminal is determined according to the transmitting coupled signal and the reflection coupling signal, and is determined
The communication terminal is currently resident the corresponding predeterminated frequency section of channel；
According to antenna environment load, the mapping relations of predeterminated frequency section and matching impedance, the antenna environment load and institute are determined
State the corresponding matching impedance of predeterminated frequency section；Set the impedance of impedance matching unit to the matching impedance determined.
8. the method for claim 7, which is characterized in that it is corresponding that the determination communication terminal is currently resident channel
Predeterminated frequency section, including：
Judge the communication terminal currently be resident channel frequency range in whether include predeterminated frequency section separation；
If it is not, predeterminated frequency section belonging to the frequency range of current resident channel is currently resident letter as the communication terminal
The corresponding predeterminated frequency section in road；
If so, by predeterminated frequency section belonging to the frequency range of the adjacent channel of current resident channel, eventually as the communication
Currently it is resident the corresponding predeterminated frequency section of channel in end.
9. the method for claim 7, which is characterized in that described according to the transmitting coupled signal and the reflection coupling
Signal determines the antenna environment load of communication terminal, including：
Detect the first amplitude and first phase of the transmitting coupled signal, and the second width of the detection reflection coupling signal
Value and second phase；
According to the first amplitude, the first phase, second amplitude and the second phase, the signal reflex is determined
Coefficient；
The antenna environment load of the communication terminal is determined according to the signal reflex coefficient and default load.
10. a kind of communication terminal, which is characterized in that including power amplifier, filter, transceiver and such as claim 1~6 times
Impedance-matching device described in one.
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| CN201810725339.6A CN108900206A (en) | 2018-07-04 | 2018-07-04 | A kind of impedance-matching device, impedance matching methods and communication terminal |
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| CN201810725339.6A CN108900206A (en) | 2018-07-04 | 2018-07-04 | A kind of impedance-matching device, impedance matching methods and communication terminal |
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| CN111969966A (en) * | 2020-07-10 | 2020-11-20 | 普联技术有限公司 | Impedance adjusting method and device and terminal equipment |
| CN112152648A (en) * | 2020-09-08 | 2020-12-29 | Oppo广东移动通信有限公司 | Radio frequency circuit, power adjusting method and communication terminal |
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| CN112291022A (en) * | 2020-11-02 | 2021-01-29 | 维沃移动通信有限公司 | Radio frequency parameter detection circuit, method and electronic equipment |
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