CN107528601B - The automatic tuning apparatus of transmitter loop antenna and tuning methods based on the device - Google Patents

The automatic tuning apparatus of transmitter loop antenna and tuning methods based on the device Download PDF

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CN107528601B
CN107528601B CN201710777537.2A CN201710777537A CN107528601B CN 107528601 B CN107528601 B CN 107528601B CN 201710777537 A CN201710777537 A CN 201710777537A CN 107528601 B CN107528601 B CN 107528601B
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differential
signal
output
radio frequency
comparator
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CN201710777537.2A
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CN107528601A (en
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谢鹏
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无锡泽太微电子有限公司
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Abstract

The present invention provides a kind of automatic tuning apparatus of transmitter loop antenna and the tuning methods based on the device, wherein the automatic tuning apparatus includes adjustable condenser array, differential power amplifier and tuning control system;Tuning methods based on the device are the following steps are included: preset reference voltage;Synchronization process differential radio frequency input signal and differential radio frequency output signal;The capacitance for configuring the adjustable condenser array is median;Sample differential radio-frequency input signals and differential radio frequency output signal are simultaneously mixed after carrying out IQ orthogonal frequency division again, filter out the high fdrequency component in mixing output difference signal, obtain mixing differential DC voltages, the advanced comparison of phase and lag between differential radio frequency input signal and differential radio frequency output signal is carried out according to mixing differential DC voltages and reference voltage to compare, judge whether the loop antenna is in resonant state, and numerical control instruction is exported to the adjustable condenser array, adjust the capacitance size of the adjustable condenser array.

Description

The automatic tuning apparatus of transmitter loop antenna and tuning methods based on the device

Technical field

The present invention relates to a kind of antenna tuning fields, specifically, relate to a kind of automatic tuning of transmitter loop antenna Device and tuning methods based on the device.

Background technique

Antenna is that the device of electromagnetic wave is radiated or received from space to space in radio transceiver system.Its middle ring day Line is a kind of most antenna of short-distance wireless communication application because loop antenna a conducting wire need to be only coiled into certain shapes or Certain shapes is routed on pcb board, it is such as round, it is rectangular etc..But there are some non-ideal factors, such as circuit board for loop antenna On parasitic parameter effect and nonuniformity, manpower or other metal objects can all cause loop antenna to lose close to loop antenna etc. It is humorous, reduce transmission power.So needing an automatic tuning mechanism to guarantee the performance of antenna.

Existing automatic tuning scheme is whether to judge loop antenna using the signal strength instruction (RSST) of receives link It is detuning, by a feedback mechanism, the inductively or capacitively tuning of Lai Shixian loop antenna is adjusted in matching network.This scheme It is widely used in radio transmitting and receiving chip.But in single-shot radio frequency chip, specially redesigned to realize antenna automatic tuning One receives link, this is clearly unadvisable.

In order to solve the above problems, people are seeking always a kind of ideal technical solution.

Summary of the invention

The purpose of the present invention is in view of the deficiencies of the prior art, to provide a kind of automatic tuning of transmitter loop antenna Device and tuning methods based on the device.

To achieve the goals above, the technical scheme adopted by the invention is that: a kind of automatic tuning of transmitter loop antenna Device, including adjustable condenser array, differential power amplifier and tuning control system;

The differential power amplifier is connect with loop antenna, for leading to after differential radio frequency input signal is amplified processing Loop antenna is crossed to external radiation;

The tuning control system is separately connected the differential power amplifier and the adjustable condenser array, according to institute The phase difference of the differential radio frequency input signal and differential radio frequency output signal of stating differential power amplifier judges that the loop antenna is It is no detuning, and numerical control instruction is exported to the adjustable condenser array;

The adjustable condenser array and the loop antenna compose in parallel resonance circuit, according to the tuning control system The capacitor equivalent value of numerical control instruction dynamic regulation adjustable condenser array realizes the tuning to the loop antenna.

Based on above-mentioned, the tuning control system includes that input sampling frequency dividing circuit, output sampling frequency dividing circuit, switch are mixed Frequency circuit, low-pass filter circuit, comparator and logic control circuit;

The input sampling frequency dividing circuit connects the input terminal of the differential power amplifier, to differential radio frequency input signal Scaling down processing is sampled and carried out, two-way IQ orthogonal frequency division differential signal is obtained;

The output sampling frequency dividing circuit connects the output end of the differential power amplifier, to differential radio frequency output signal Scaling down processing is sampled and carried out, two-way IQ orthogonal frequency division differential signal is obtained;

The switch mixting circuit is separately connected the input sampling frequency dividing circuit and output sampling frequency dividing circuit, Extract differential radio frequency input signal the road I frequency dividing differential signal and differential radio frequency output signal the road Q frequency dividing differential signal or The road the I frequency dividing differential signal of the road the Q frequency dividing differential signal and differential radio frequency output signal that extract differential radio frequency input signal carries out Frequency mixing processing obtains mixing output difference signal;

The low-pass filter circuit is connect with the switch mixting circuit, for filtering out in mixing output difference signal High fdrequency component, obtain mixing differential DC voltages;

The comparator is connect with the low-pass filter circuit, is carried out according to mixing differential DC voltages and reference voltage The advanced comparison of phase and lag compare between differential radio frequency input signal and differential radio frequency output signal;

The logic control circuit judges whether the loop antenna is in resonance shape according to the comparison result of the comparator State, and numerical control instruction is exported to the adjustable condenser array.

Based on above-mentioned, it is electric that the input sampling frequency dividing circuit and output sampling frequency dividing circuit are that identical sampling divides Road;

The sampling frequency dividing circuit includes sample circuit, shaping circuit and IQ quadrature divider, the sample circuit and institute Input terminal or the output end connection for stating differential power amplifier, for differential radio frequency input signal or differential radio frequency output signal It is sampled;

The shaping circuit is connect with the sample circuit, and it is whole to carry out square wave for the sampling result to the sample circuit Shape processing;

The IQ quadrature divider is connect with the shaping circuit, for the square-wave signal after shaping to be divided into the road I point Frequency difference sub-signal and the road Q divide differential signal.

Based on above-mentioned, the comparator includes advanced comparator and hysteresis comparator.

Based on above-mentioned, the tuning control system further includes control register, the control register and the comparator Connection, for configuring the reference voltage of the comparator.

The present invention also provides a kind of tuning methods based on the automatic tuning apparatus, comprising the following steps:

Preparation stage

Step 1 presets the reference voltage of the comparator;

Step 2, synchronization process differential radio frequency input signal and differential radio frequency output signal;

Step 3, the capacitance for configuring the adjustable condenser array is median;

Automatic tuning phase

Step 4 samples and is carried out to differential radio frequency input signal and differential radio frequency output signal scaling down processing, respectively obtains It obtains the road I frequency dividing differential signal and the road Q divides differential signal;

Step 5 extracts the road I frequency dividing differential signal and the road Q point of differential radio frequency output signal of differential radio frequency input signal Frequency difference sub-signal or the road Q frequency dividing differential signal and the road I point of differential radio frequency output signal for extracting differential radio frequency input signal Frequency difference sub-signal carries out Frequency mixing processing, obtains mixing output difference signal;

Step 6 filters out the high fdrequency component in mixing output difference signal, mixing differential DC voltages is obtained, according to mixed Phase is advanced between frequency differential DC voltages and reference voltage progress differential radio frequency input signal and differential radio frequency output signal Compare and lag compares;

Step 7 judges whether the loop antenna is in resonance according to the comparison result of advanced comparator and hysteresis comparator State, and numerical control instruction is exported to the adjustable condenser array, the capacitance size of the adjustable condenser array is adjusted, To realize the tuning to the loop antenna.

Based on above-mentioned, the capacitance of adjustable condenser array described in step 3 is median, that is, adjustable condenser battle array The highest logic control position of column capacitance is " 1 ", other logic control positions are all " 0 ".

Based on above-mentioned, in step 6, differential radio frequency input signal is carried out according to mixing differential DC voltages and reference voltage The advanced specific steps compared and lag compares of phase between differential radio frequency output signal are as follows:

The advanced comparator and lag ratio if mixing differential DC voltages are less than preset reference DC voltage Output result compared with device is " 0 ";

If be mixed differential DC voltages be negative value and be greater than it is preset refer to DC voltage, the advanced comparator it is defeated Result is " 1 " out, and the output result of the hysteresis comparator is " 0 ";

If be mixed differential DC voltages be positive value and be greater than it is preset refer to DC voltage, the advanced comparator it is defeated Result is " 0 " out, and the output result of the hysteresis comparator is " 1 ".

Based on above-mentioned, the specific steps in step 7 include:

If a), the output of the advanced comparator is " 1 ", the output of the hysteresis comparator is " 0 ", then judges the ring The parallel resonance frequency of antenna is greater than working frequency, keeps the adjustable condenser array by the logic control circuit at this time Highest logic control position be " 1 ", and set " 1 " for time high logic control position of the adjustable condenser array;

Read again the output of the advanced comparator and the hysteresis comparator as a result, using dichotomy iteration method The capacitance for increasing the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all Stop iteration when " 0 ";

If b), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 1 ", then judges the ring The parallel resonance frequency of antenna is less than working frequency, passes through the logic control circuit at this time for the adjustable condenser array Highest logic control position becomes " 0 ", and sets " 1 " for time high logic control position of the adjustable condenser array;

Read again the output of the advanced comparator and the hysteresis comparator as a result, using dichotomy iteration method The capacitance for reducing the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all Stop iteration when " 0 ";

If c), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 0 ", then judges the ring The parallel resonance frequency of antenna is equal to working frequency, keeps the existing capacitance of adjustable condenser array at this time.

The present invention has substantive distinguishing features outstanding and significant progress compared with the prior art, specifically, needle of the present invention To the automatic tunable technology of transmitter loop antenna, by comparing the phase of differential radio frequency input signal and differential radio frequency output signal Difference is achieved that the automatic tuning of loop antenna with simple basic circuit structure, overcomes loop antenna to manpower or other objects Close to the influence of antenna, it is highly suitable for hand-held and wireless wearing product.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the embodiment of the present invention one.

Fig. 2 is the structural schematic diagram of the embodiment of the present invention two.

Specific embodiment

Below by specific embodiment, technical scheme of the present invention will be described in further detail.

Embodiment one

As shown in Figure 1, in order to realize that the present invention provides a kind of transmitters to the automatic tunable technology of transmitter loop antenna The automatic tuning apparatus of loop antenna, including adjustable condenser array, differential power amplifier and tuning control system;

The differential power amplifier is connect with loop antenna, for leading to after differential radio frequency input signal is amplified processing Loop antenna is crossed to external radiation;

The tuning control system is separately connected the differential power amplifier and the adjustable condenser array, according to institute The phase difference of the differential radio frequency input signal and differential radio frequency output signal of stating differential power amplifier judges that the loop antenna is It is no detuning, and numerical control instruction is exported to the adjustable condenser array;

The adjustable condenser array and the loop antenna compose in parallel resonance circuit, according to the tuning control system The capacitor equivalent value of numerical control instruction dynamic regulation adjustable condenser array realizes the tuning to the loop antenna.

When designing the adjustable condenser array, shunt capacitance group can be designed according to capacitance size needed for loop antenna Number.Wherein, each capacitance group includes multiple capacitors and control switch, each capacitor connect with a control switch after with its His capacitor is in parallel;Every group of capacitance can be designed according to the required precision of the loop antenna working frequency.The tuning control The numerical control instruction of device controls the opening and closing of the control switch, so adjust the adjustable condenser array etc. Imitate capacitance.

The present invention judges loop antenna by comparing the phase difference of differential radio frequency input signal and differential radio frequency output signal It is whether detuning, the adjustable condenser is realized by exporting numerical control instruction to the adjustable condenser array if detuning The various forms of switchings of array, and then generate a dynamic equivalent capacity;By the equivalent ginseng for changing adjustable condenser array Number compensates the variation of the loop antenna, stablizes the parallel resonance frequency of loop antenna and then stablizes the output power of loop antenna, realizes Tuning to the loop antenna.

Specifically, the tuning control system includes input sampling frequency dividing circuit, output sampling frequency dividing circuit, switch mixing Circuit, low-pass filter circuit, comparator and logic control circuit;

The input sampling frequency dividing circuit connects the input terminal of the differential power amplifier, to differential radio frequency input signal Scaling down processing is sampled and carried out, two-way IQ orthogonal frequency division differential signal is obtained;

The output sampling frequency dividing circuit connects the output end of the differential power amplifier, to differential radio frequency output signal Scaling down processing is sampled and carried out, two-way IQ orthogonal frequency division differential signal is obtained;

The switch mixting circuit is separately connected the input sampling frequency dividing circuit and output sampling frequency dividing circuit, Extract differential radio frequency input signal the road I frequency dividing differential signal and differential radio frequency output signal the road Q frequency dividing differential signal or The road the I frequency dividing differential signal of the road the Q frequency dividing differential signal and differential radio frequency output signal that extract differential radio frequency input signal carries out Frequency mixing processing obtains mixing output difference signal;

The logic control circuit judges whether the loop antenna is in resonance shape according to the comparison result of the comparator State, and numerical control instruction is exported to the adjustable condenser array.

Preferably, the input sampling frequency dividing circuit and output sampling frequency dividing circuit are identical sampling frequency dividing electricity Road;

The sampling frequency dividing circuit includes sample circuit, shaping circuit and IQ quadrature divider, the sample circuit and institute Input terminal or the output end connection for stating differential power amplifier, for differential radio frequency input signal or differential radio frequency output signal It is sampled;

The shaping circuit is connect with the sample circuit, and it is whole to carry out square wave for the sampling result to the sample circuit Shape processing;

The IQ quadrature divider is connect with the shaping circuit, for the square-wave signal after shaping to be divided into the road I point Frequency difference sub-signal and the road Q divide differential signal.

Specifically, the detuning situation due to loop antenna is related to the Q value of loop antenna and internal adjustable capacitor, tuning Need to be arranged suitable comparator reference voltage in the process.So the tuning control system further includes control register, described Control register is connect with the comparator, for configuring the reference voltage of the comparator.

The present invention also provides a kind of tuning methods based on the automatic tuning apparatus, comprising the following steps:

Preparation stage

Step 1 presets the reference voltage of the comparator;

Step 2, synchronization process differential radio frequency input signal and differential radio frequency output signal;

Step 3, the capacitance for configuring the adjustable condenser array is median, i.e., by the adjustable condenser array The highest logic control position of capacitor is configured to " 1 ", other logic control positions are each configured to " 0 ";

Automatic tuning phase

Step 4 samples and is carried out to differential radio frequency input signal and differential radio frequency output signal scaling down processing, respectively obtains It obtains the road I frequency dividing differential signal and the road Q divides differential signal;

Step 5 extracts the road I frequency dividing differential signal and the road Q point of differential radio frequency input signal of differential radio frequency output signal Frequency difference sub-signal carries out Frequency mixing processing, obtains mixing output difference signal;

The formula for switching mixing is as follows:

Wherein, U1, U2 respectively represent the road the I frequency dividing differential signal and differential radio frequency input signal of differential radio frequency output signal The road Q frequency dividing differential signal signal amplitude, φ 1, φ 2 respectively represent the road Q point of the road I the frequency dividing differential signal and input of output The phase of frequency difference sub-signal;Obviously, mixing output difference signal be a direct current signal and two frequencys multiplication high-frequency signal it With;

Step 6 filters out the high fdrequency component in mixing output difference signal, retains direct current signal, i.e. mixing differential DC Voltage Vop-Von;Differential radio frequency input signal and differential radio frequency output are carried out according to mixing differential DC voltages and reference voltage The advanced comparison of phase difference and lag compare between signal;

DC voltage, the i.e. road the I frequency dividing of differential radio frequency output signal are referred to less than preset if being mixed differential DC voltages The road Q of differential signal and differential radio frequency input signal divide differential signal phase difference be 90 degree, then the advanced comparator with The output result of the hysteresis comparator is " 0 ";

If being mixed differential DC voltages to be negative value and be greater than and preset refer to DC voltage, i.e. differential radio frequency output signal The phase difference that the road I divides the road the Q frequency dividing differential signal of differential signal and differential radio frequency input signal is greater than 90 degree, then described advanced The output result of comparator is " 1 ", and the output result of the hysteresis comparator is " 0 ";

If being mixed differential DC voltages to be positive value and be greater than and preset refer to DC voltage, i.e. differential radio frequency output signal The phase difference of the road I frequency dividing differential signal and the road the Q frequency dividing differential signal of differential radio frequency input signal is less than 90 degree, then described advanced The output result of comparator is " 0 ", and the output result of the hysteresis comparator is " 1 ";

Step 7 judges whether the loop antenna is in resonance according to the comparison result of advanced comparator and hysteresis comparator State, and numerical control instruction is exported to the adjustable condenser array, the capacitance size of the adjustable condenser array is adjusted, To realize the tuning to the loop antenna;

If a), the output of the advanced comparator is " 1 ", the output of the hysteresis comparator is " 0 ", then judges the ring The parallel resonance frequency of antenna is greater than working frequency, keeps the adjustable condenser array by the logic control circuit at this time Highest logic control position be " 1 ", and set " 1 " for time high logic control position of the adjustable condenser array;

Read again the output of the advanced comparator and the hysteresis comparator as a result, using dichotomy iteration method The capacitance for increasing the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all Stop iteration when " 0 ";

If b), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 1 ", then judges the ring The parallel resonance frequency of antenna is less than working frequency, passes through the logic control circuit at this time for the adjustable condenser array Highest logic control position becomes " 0 ", and sets " 1 " for time high logic control position of the adjustable condenser array;

Read again the output of the advanced comparator and the hysteresis comparator as a result, using dichotomy iteration method The capacitance for reducing the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all Stop iteration when " 0 ";

If c), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 0 ", then judges the ring The parallel resonance frequency of antenna is equal to working frequency, keeps the existing capacitance of adjustable condenser array at this time.

Embodiment two

It is in place of the present embodiment and the difference of embodiment one: as shown in Fig. 2, step 5, extracts differential radio frequency output letter Number the road Q frequency dividing differential signal and differential radio frequency input signal the road I frequency dividing differential signal carry out Frequency mixing processing, obtain mixing it is defeated Differential signal out.

At this point, if mixing differential DC voltages refer to DC voltage, the i.e. road I of differential radio frequency output signal less than preset The phase difference for dividing the road the Q frequency dividing differential signal of differential signal and differential radio frequency input signal is 90 degree, then the advanced comparison The output result of device and the hysteresis comparator is " 0 ";

If being mixed differential DC voltages to be negative value and be greater than and preset refer to DC voltage, i.e. differential radio frequency input signal The phase difference that the road I divides the road the Q frequency dividing differential signal of differential signal and differential radio frequency output signal is greater than 90 degree, then described advanced The output result of comparator is " 1 ", and the output result of the hysteresis comparator is " 0 ";The parallel resonance frequency of the i.e. described loop antenna Rate is greater than working frequency, is at this time become the highest logic control position of the adjustable condenser array by the logic control circuit For " 1 ", and " 1 " is set by time high logic control position of the adjustable condenser array;Read again the advanced comparator Output with the hysteresis comparator is as a result, increase the capacitor of the adjustable condenser array using the method for dichotomy iteration Value, stops iteration when the output result of the advanced comparator and the hysteresis comparator is all " 0 ";

If mixing differential DC voltages are positive value, i.e., the road the I frequency dividing differential signal of differential radio frequency input signal and difference are penetrated The phase difference of the road the Q frequency dividing differential signal of frequency output signal is less than 90 degree, then the output result of the advanced comparator is " 0 ", The output result of the hysteresis comparator is " 1 ", i.e., the parallel resonance frequency of the described loop antenna is less than working frequency, passes through at this time It is " 0 " that the logic control circuit, which keeps the highest logic control position of the adjustable condenser array, and by the adjustable economize on electricity Time high logic control position for holding array is set as " 1 ";Read again the output of the advanced comparator and the hysteresis comparator As a result, reducing the capacitance of the adjustable condenser array using the method for dichotomy iteration, when the advanced comparator and institute The output result for stating hysteresis comparator stops iteration when being all " 0 ".

Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof;To the greatest extent The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced;Without departing from this hair The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.

Claims (8)

1. a kind of automatic tuning apparatus of transmitter loop antenna, it is characterised in that: put including adjustable condenser array, differential power Big device and tuning control system;
The differential power amplifier is connect with loop antenna, for passing through ring after differential radio frequency input signal is amplified processing Antenna is to external radiation;
The tuning control system is separately connected the differential power amplifier and the adjustable condenser array, according to the difference The phase difference of the differential radio frequency input signal and differential radio frequency output signal of dividing power amplifier judges whether the loop antenna loses It is humorous, and numerical control instruction is exported to the adjustable condenser array;
The adjustable condenser array and the loop antenna compose in parallel resonance circuit, according to the number of the tuning control system The capacitor equivalent value of control instruction dynamic regulation adjustable condenser array realizes the tuning to the loop antenna;
The tuning control system includes input sampling frequency dividing circuit, output sampling frequency dividing circuit, switch mixting circuit, low pass filtered Wave circuit, comparator and logic control circuit;
The input sampling frequency dividing circuit connects the input terminal of the differential power amplifier, samples to differential radio frequency input signal And IQ orthogonal frequency division processing is carried out, obtain two-way IQ orthogonal frequency division differential signal;
The output sampling frequency dividing circuit connects the output end of the differential power amplifier, samples to differential radio frequency output signal And IQ orthogonal frequency division processing is carried out, obtain two-way IQ orthogonal frequency division differential signal;
The switch mixting circuit is separately connected the input sampling frequency dividing circuit and output sampling frequency dividing circuit, extracts The road the I frequency dividing differential signal of differential radio frequency input signal and the road the Q frequency dividing differential signal of differential radio frequency output signal or extraction The road the Q frequency dividing differential signal of differential radio frequency input signal and the road the I frequency dividing differential signal of differential radio frequency output signal are mixed Processing obtains mixing output difference signal;
The low-pass filter circuit is connect with the switch mixting circuit, for filtering out the height in mixing output difference signal Frequency component obtains mixing differential DC voltages;
The comparator is connect with the low-pass filter circuit, carries out difference according to mixing differential DC voltages and reference voltage The advanced comparison of phase and lag compare between radio-frequency input signals and differential radio frequency output signal;
The logic control circuit judges whether the loop antenna is in resonant state according to the comparison result of the comparator, and Numerical control instruction is exported to the adjustable condenser array.
2. the automatic tuning apparatus of transmitter loop antenna according to claim 1, it is characterised in that: the input sampling point Frequency circuit and output sampling frequency dividing circuit are identical sampling frequency dividing circuit;
The sampling frequency dividing circuit includes sample circuit, shaping circuit and IQ quadrature divider, the sample circuit and the difference Input terminal or the output end connection for dividing power amplifier, for being carried out to differential radio frequency input signal or differential radio frequency output signal Sampling;
The shaping circuit is connect with the sample circuit, is carried out at square wave shaping for the sampling result to the sample circuit Reason;
The IQ quadrature divider is connect with the shaping circuit, poor for the square-wave signal after shaping to be divided into the road I frequency dividing Sub-signal and the road Q divide differential signal.
3. the automatic tuning apparatus of transmitter loop antenna according to claim 2, it is characterised in that: the comparator includes Advanced comparator and hysteresis comparator.
4. the automatic tuning apparatus of transmitter loop antenna according to claim 3, it is characterised in that: the tuning control dress Setting further includes control register, and the control register is connect with the comparator, for configuring the reference electricity of the comparator Pressure.
5. a kind of tuning methods based on automatic tuning apparatus as claimed in claim 4, which comprises the following steps:
Preparation stage
Step 1 presets the reference voltage of the comparator;
Step 2, synchronization process differential radio frequency input signal and differential radio frequency output signal;
Step 3, the capacitance for configuring the adjustable condenser array is median;
Automatic tuning phase
Step 4 samples to differential radio frequency input signal and differential radio frequency output signal and carries out scaling down processing, respectively obtains the road I It divides differential signal and the road Q divides differential signal;
The road the Q frequency dividing of step 5, the road the I frequency dividing differential signal and differential radio frequency output signal that extract differential radio frequency input signal is poor Sub-signal or the road Q for extracting differential radio frequency input signal divide differential signal and the road the I frequency dividing of differential radio frequency output signal is poor Sub-signal carries out Frequency mixing processing, obtains mixing output difference signal;
Step 6 filters out the high fdrequency component in mixing output difference signal, obtains mixing differential DC voltages, poor according to being mixed DC voltage and reference voltage is divided to carry out the advanced comparison of phase between differential radio frequency input signal and differential radio frequency output signal Compare with lag;
Step 7 judges whether the loop antenna is in resonance shape according to the comparison result of advanced comparator and hysteresis comparator State, and numerical control instruction is exported to the adjustable condenser array, the capacitance size of the adjustable condenser array is adjusted, with Realize the tuning to the loop antenna.
6. the tuning methods of automatic tuning apparatus according to claim 5, it is characterised in that: will be described adjustable in step 3 The highest logic control position that the capacitance of section capacitor array is configured to the i.e. described adjustable condenser array capacitor of median is " 1 ", Other logic control positions are all " 0 ".
7. the tuning methods of automatic tuning apparatus according to claim 6, which is characterized in that in step 6, according to mixing Differential DC voltages and reference voltage carry out the advanced ratio of phase between differential radio frequency input signal and differential radio frequency output signal Compared with the specific steps compared with lag are as follows:
DC voltage, the advanced comparator and the hysteresis comparator are referred to less than preset if being mixed differential DC voltages Output result be " 0 ";
If the value for being mixed differential DC voltages signal is negative value and is greater than preset with reference to DC voltage, the advanced comparator Output result be " 1 ", the output result of the hysteresis comparator is " 0 ";
If the value of filtered mixing output difference signal is positive value and is greater than preset with reference to DC voltage, the advanced ratio Output result compared with device is " 0 ", and the output result of the hysteresis comparator is " 1 ".
8. the tuning methods of automatic tuning apparatus according to claim 7, which is characterized in that the specific steps in step 7 Include:
If a), the output of the advanced comparator is " 1 ", the output of the hysteresis comparator is " 0 ", then judges the loop antenna Parallel resonance frequency be greater than working frequency, the adjustable condenser array is kept most by the logic control circuit at this time High logic control position is " 1 ", and sets " 1 " for time high logic control position of the adjustable condenser array;
The output of the advanced comparator and the hysteresis comparator is read again as a result, the method using dichotomy iteration increases The capacitance of the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all " 0 " When stop iteration;
If b), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 1 ", then judges the loop antenna Parallel resonance frequency be less than working frequency, at this time by the logic control circuit by the highest of the adjustable condenser array Logic control position becomes " 0 ", and sets " 1 " for time high logic control position of the adjustable condenser array;
The output of the advanced comparator and the hysteresis comparator is read again as a result, the method using dichotomy iteration reduces The capacitance of the adjustable condenser array, when the output result of the advanced comparator and the hysteresis comparator is all " 0 " When stop iteration;
If c), the output of the advanced comparator is " 0 ", the output of the hysteresis comparator is " 0 ", then judges the loop antenna Parallel resonance frequency be equal to working frequency, keep the existing capacitance of adjustable condenser array at this time.
CN201710777537.2A 2017-09-01 2017-09-01 The automatic tuning apparatus of transmitter loop antenna and tuning methods based on the device CN107528601B (en)

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CN107528601B true CN107528601B (en) 2019-07-23

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058372B1 (en) * 2002-11-01 2006-06-06 Integration Associates Inc. Method and apparatus for automatic tuning of a resonant loop antenna
CN101233653A (en) * 2004-06-25 2008-07-30 英特尔公司 Mems based tunable antena for wireless reception and transmission
CN101728642A (en) * 2008-10-27 2010-06-09 爱特梅尔汽车股份有限公司 Circuit for loop antenna and method used for turning
US8320850B1 (en) * 2009-03-18 2012-11-27 Rf Micro Devices, Inc. Power control loop using a tunable antenna matching circuit
CN105306626A (en) * 2014-07-23 2016-02-03 黑莓有限公司 Mobile wireless communications device with improved broadband antenna impedance matching

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7058372B1 (en) * 2002-11-01 2006-06-06 Integration Associates Inc. Method and apparatus for automatic tuning of a resonant loop antenna
CN101233653A (en) * 2004-06-25 2008-07-30 英特尔公司 Mems based tunable antena for wireless reception and transmission
CN101728642A (en) * 2008-10-27 2010-06-09 爱特梅尔汽车股份有限公司 Circuit for loop antenna and method used for turning
US8320850B1 (en) * 2009-03-18 2012-11-27 Rf Micro Devices, Inc. Power control loop using a tunable antenna matching circuit
CN105306626A (en) * 2014-07-23 2016-02-03 黑莓有限公司 Mobile wireless communications device with improved broadband antenna impedance matching

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