CN206211955U - A kind of Adaptive matching circuit - Google Patents
A kind of Adaptive matching circuit Download PDFInfo
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- CN206211955U CN206211955U CN201621123918.6U CN201621123918U CN206211955U CN 206211955 U CN206211955 U CN 206211955U CN 201621123918 U CN201621123918 U CN 201621123918U CN 206211955 U CN206211955 U CN 206211955U
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Abstract
The utility model discloses a kind of Adaptive matching circuit, including：Transmit Receive Unit, it is used to realize the transmission of radiofrequency signal and receive；Load unit, it passes through transmission line and is connected with the Transmit Receive Unit, and the load unit is energy acceptance carrier；Detection unit, it is located between the Transmit Receive Unit and load unit, and the detection unit is used to gather between the Transmit Receive Unit and the load unit energy value on transmission line, and sends a detection output signal；Impedance converter unit, it is located between the detection unit and the load unit, and the impedance converter unit is used to realize the impedance matching between the Transmit Receive Unit and load unit；Control unit, its input connects the detection unit, and its output end connects the impedance converter unit, and described control unit receives the detection output signal and output control signal changes the impedance converter unit to realize best match.
Description
Technical field
The utility model belongs to the impedance-matching art of high frequency transmission circuit, is a kind of Adaptive matching more specifically
Circuit.
Background technology
When high frequency signal transmission when input and output impedance mismatch, it may occur that reflection effect causes output end
Energy cannot effectively export input, therefore HF link front stage generally adds impedance matching circuit.It is generally used for high frequency
The component of matching is electric capacity, inductance or open circuit microstrip line, the short-circuit micro-band line of customization.
In the case where signal source and load impedance keep constant, requirement can be met with fixed matching, but very
The impedance loaded when many can follow the change of environment and change.Such as antenna element, be all when being commonly designed antenna by
According to free space Environment Design, but when antenna is more than 1 medium near metal, human body or other dielectric constants,
Its impedance operator will change.In this case, if the matching unit in circuit employs steady state value, then originally
The unit of impedance matching will not be matched between input, output under free space, so as to reduce energy transmission efficiency.Matching electricity
Road component in itself also changes with the variation characteristic of temperature, it is also possible to cause above-mentioned mismatch case.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art or defect, there is provided a kind of Adaptive matching circuit, should
Adaptive matching circuit automatic detection circuit mating situation and can adjust match circuit value.
To achieve these goals, the utility model employs following technical scheme：
A kind of Adaptive matching circuit includes：Transmit Receive Unit, it is used to realize the transmission of radiofrequency signal and receive；It is negative
Carrier unit, it passes through transmission line and is connected with the Transmit Receive Unit, and the load unit is energy acceptance carrier；Detection list
Unit, it is located between the Transmit Receive Unit and load unit, the detection unit be used for gather the Transmit Receive Unit with
Energy value on transmission line between the load unit, and send a detection output signal；Impedance converter unit, it is located at the inspection
Between ripple unit and the load unit, the impedance converter unit be used to realizing the Transmit Receive Unit and load unit it
Between impedance matching；Control unit, its input connects the detection unit, and its output end connects the impedance converter unit,
Described control unit receives the detection output signal and output control signal changes the impedance converter unit to realize most preferably
Matching.
In Circuit Matching, Voltage Peak when the high-frequency signal voltage peak value of the Transmit Receive Unit output is less than mismatch
Value.
The detection unit is formed by coupler and detector array.
The impedance converter unit is the connection combination of electric capacity, inductance, open circuit microstrip line, short-circuit micro-band line.
The impedance converter unit is provided with a varactor as one of impedance transformer part.
Inductance is in series with the varactor.
The corresponding relation of detection unit output and actual transmissions efficiency is prestored in described control unit, the corresponding relation is made
The foundation of Optimal Control signal is exported for described control unit.
As a result of above-mentioned technological means, the adaptive circuit of the application is adapted to by detection unit automatic detection circuit
Situation, and match circuit value is adjusted by the collective effect of detection unit, control unit and impedance converter unit, can be effectively
The situation for avoiding match circuit from matching, improves the efficiency of transmission of higher frequency signal energy.
Brief description of the drawings
Fig. 1 is the system block diagram of the application；
Fig. 2 is the circuit design schematic diagram of an embodiment of the application.
Fig. 3 is impedance variations tendency chart of the shunt capacitance inductance in smith artworks；
Fig. 4 is impedance variations tendency chart of the series capacitance inductance in smith artworks；
Fig. 5 is the schematic flow sheet of the impedance optimization method of the application Adaptive matching circuit.
Symbol in figure：
1. Transmit Receive Unit；2. detection unit；3. impedance converter unit；4. load unit；
5. control unit.
Specific embodiment
By following examples and the description of its accompanying drawing is combined, it will be further appreciated that the purpose of its utility model, specific
Architectural feature and advantage.
Shown in Figure 1, Fig. 1 is the system block diagram of the application.The Adaptive matching circuit of the application includes radio-frequency receiving-transmitting
Unit 1, detection unit 2, impedance converter unit 3, load unit 4 and control unit 5.Wherein：
Transmit Receive Unit 1 is for realizing the transmission of radiofrequency signal and receiving.Such as bluetooth transceiving chip, power output
It is usually no more than 10mW.When Circuit Matching, the high-frequency signal voltage peak value of the Transmit Receive Unit output is less than mistake
With when voltage peak.
Load unit 4 is connected with the Transmit Receive Unit by transmission line, and the load unit is carried for energy acceptance
Body.Load unit 4 can be receiving terminal or transmitting antenna.
Detection unit 2 is located between the Transmit Receive Unit and load unit, and the detection unit is used to gather described penetrating
Energy value on transmission line between frequency Transmit-Receive Unit and the load unit, and send a detection output signal.Detection unit 2 can not
The normal transmission of the radiofrequency signal sent to Transmit Receive Unit makes a big impact.Citing：Detection unit 2 can be coupler
With the combination of wave detector, coupler uses the coupler of 20dB or higher coupling ratios, so for the influence of useful signal transmission
Will be less than 1%.Wave detector can be peak detector, be transmitted when mismatch between Transmit Receive Unit 1 and load unit 4
There is standing wave on circuit, so as to cause wave detector to detect signal value with Circuit Matching when it is inconsistent, control unit 5 is accordingly
To adjust impedance matching unit 3.General very faint due to receiving signal, the process of detection is typically occurred in the utility model
When Transmit Receive Unit 1 is launched.The characteristics of transmitting identical with backward transfer character using match circuit is positive, it is public in transmitting-receiving
The best match of end transmitting altogether is commonly available to receiving path.
Impedance converter unit 3 is located between the detection unit 2 and the load unit 4, and the impedance converter unit 3 is used
In realizing the impedance matching between the Transmit Receive Unit 1 and load unit 4.Impedance converter unit 3 can be electric capacity, electricity
Sense, open circuit microstrip line, the reasonable connection combination of short-circuit micro-band line.Varactor is introduced in the utility model to be converted as impedance
One of device, control unit 5 realizes impedance matching unit according to load by being added in the change of magnitude of voltage on varactor
Change dynamic optimization adjustment direct impedance value.
The input of control unit 5 connects the detection unit 2, and its output end connects the impedance converter unit 3.It is described
Control unit 5 receives the detection output signal and output control signal changes the impedance converter unit 3 to realize optimal
Match somebody with somebody.The corresponding relation of detection unit output and actual transmissions efficiency is prestored in described control unit 5, the corresponding relation is used as institute
State the foundation that control unit 5 exports Optimal Control signal.
Shown in Figure 2, Fig. 2 is the circuit design schematic diagram of an embodiment of the application.During circuit design,
Some regions can only cannot be matched along admittance artwork downward conversion in smith artworks in view of shunt capacitance, can become
An inductance for desired value is connected on appearance diode to adjust.
As shown in Fig. 2 the second electric capacity C2 and the 5th electric capacity C5 is capacitance, the first electric capacity C1 and the 3rd electric capacity C3 is change
Hold diode, its capacitance changes with the voltage value changes for being carried in its two ends, specific control voltage size is single by control
Unit 5 exports the first control signal CTR1 and the second control signal CTR2 to control.First electric capacity C1, the first inductance L1, the 3rd electricity
Hold C3, the second inductance L2, the 4th electric capacity C4 and collectively form impedance converter unit.As shown in Fig. 2 circuit board U3 and circuit board U5 mono-
Rise and constitute detection unit 2, its output signal input control unit 5.The signal that control unit 5 is input into according to detection unit 2 judges
Current whether the impedance of load unit 4 is changed, and the first control signal CTR1 and the second control signal are passed through if change
CTR2 carrys out the size of the first electric capacity C1 and the 3rd electric capacity C3 in adjustment circuit.Detection list is checked during control signal is changed
Unit 2 is input into, the controls of the first minimum control signal CTR1 and second of the input value when best match of the record that selects and dispatch from the factory
Signal CTR2 is used as current control voltage.The effect of the first inductance L1 and the second inductance L2 is to solve shunt capacitance only
Can be converted along the downward impedance of smith admittance artworks, series capacitance can only be asked along the downward impedance conversion of smith impedance artworks
Topic.Impedance variations trend on shunt capacitance inductance and series capacitance inductance in smith artworks, can refer to Fig. 3 and Fig. 4.
Assuming that loading initial impedance 1 position on the way, then first series inductance impedance will be afterwards adjusted with the first electricity from 1 point toward 2 points of changes
Holding the increase of C1 and the 3rd electric capacity C3 has change to 3 points at 2 points.Varactor variable capacitance model of the scope of change according to selection
Depending on enclosing.
The impedance optimization method of Adaptive matching circuit of the present utility model, shown in Figure 5, the method includes following step
Suddenly：
Step 1：Described control unit 5 prestore best match when corresponding detecting circuit (U3 and U5) output valve with control believe
Number magnitude of voltage, and corresponding detecting circuit output valve is designated as setting value with control signal magnitude of voltage during by the described best match.
Step 2：Detection unit 2 detects between the Transmit Receive Unit 1 and the load unit 4 energy on transmission line
Value, and export a detection output signal.Whether described control unit 5 detects the detection output signal all the time in described in
Near setting value.Then keep control voltage constant if less than setting value, carry out step 5；If greater than setting value then, walked
Rapid 3.
Step 3：It is continuous in the range of controllable voltage to change output control signal magnitude of voltage, and record the inspection of corresponding voltage value
Wave circuit is exported.
Step 4：Detection electricity when the best match recorded in wave detector output the record result, with step 1 according to step 3
Road output valve compares, and the minimum value of selection difference is current best match value, and the fixed control voltage controls the impedance to become
Change unit.
Step 5：The detection unit is waited to detect unlatching next time.
By taking Bluetooth antenna Match circuits as an example, impedance matching dynamic adjustment process is implemented as follows：
(1) productions stage, corresponding detecting circuit output valve and control signal voltage when record best match
Value；
(2) control units detection detecting circuit output, if all the time near output valve when best match,
If it is keep control voltage constant, if it is not, carrying out (3)；
(3) is continuous in the range of controllable voltage changes output control signal magnitude of voltage, and records the detection of corresponding voltage value
Circuit output；
(4) according to the wave detector of (3) output record result, detecting circuit is exported when the best match of record with (1)
Value compares, and the minimum value of difference is current best match value, the fixed pole of transfiguration two controlled with this control voltage in match circuit
Pipe；
(5) after the setting time of intervals, above-mentioned (2)~(4) are repeated, to prevent antenna surrounding environment change from causing again
Mismatch case.
The utility model sharpest edges are within the specific limits can be according to the installation environment of device antenna adjustment matching electricity
Road, optimizes higher frequency signal energy efficiency of transmission, reduces the reflection effect on holding wire, increases signal transmission distance.
It should be understood that these implementation methods are merely to illustrate the application rather than limitation scope of the present application.In addition should manage
Solution, after the content for having read the application instruction, those skilled in the art can make various changes or modifications to the application, this
A little equivalent form of values equally fall within the application appended claims limited range.
Claims (7)
1. a kind of Adaptive matching circuit, it is characterised in that including：
Transmit Receive Unit, it is used to realize the transmission of radiofrequency signal and receive；
Load unit, it passes through transmission line and is connected with the Transmit Receive Unit, and the load unit is energy acceptance carrier；
Detection unit, it is located between the Transmit Receive Unit and load unit, and the detection unit is used to gather the radio frequency
Energy value on transmission line between Transmit-Receive Unit and the load unit, and send a detection output signal；
Impedance converter unit, it is located between the detection unit and the load unit, and the impedance converter unit is used for real
Existing impedance matching between the Transmit Receive Unit and load unit；
Control unit, its input connects the detection unit, and its output end connects the impedance converter unit, the control list
Unit receives the detection output signal and output control signal changes the impedance converter unit to realize best match.
2. Adaptive matching circuit according to claim 1, it is characterised in that in Circuit Matching, the radio-frequency receiving-transmitting
Voltage peak when the high-frequency signal voltage peak value of unit output is less than mismatch.
3. Adaptive matching circuit according to claim 1, it is characterised in that the detection unit is by coupler and detection
Device is combined.
4. Adaptive matching circuit according to claim 1, it is characterised in that the impedance converter unit is electric capacity, electricity
Sense, open circuit microstrip line, the connection combination of short-circuit micro-band line.
5. Adaptive matching circuit according to claim 4, it is characterised in that the impedance converter unit is provided with a transfiguration
Diode is used as one of impedance transformer part.
6. Adaptive matching circuit according to claim 5, it is characterised in that be in series with electricity on the varactor
Sense.
7. Adaptive matching circuit according to claim 1, it is characterised in that detection list is prestored in described control unit
Unit's output and the corresponding relation of actual transmissions efficiency, the corresponding relation as described control unit output Optimal Control signal according to
According to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621123918.6U CN206211955U (en) | 2016-10-14 | 2016-10-14 | A kind of Adaptive matching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621123918.6U CN206211955U (en) | 2016-10-14 | 2016-10-14 | A kind of Adaptive matching circuit |
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| CN206211955U true CN206211955U (en) | 2017-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411284A (en) * | 2016-10-14 | 2017-02-15 | 上海移为通信技术股份有限公司 | Self-adaptive matching circuit and impedance optimization method thereof |
-
2016
- 2016-10-14 CN CN201621123918.6U patent/CN206211955U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411284A (en) * | 2016-10-14 | 2017-02-15 | 上海移为通信技术股份有限公司 | Self-adaptive matching circuit and impedance optimization method thereof |
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