CN110474631A - A kind of adaptive RF filter and its adaptive RF filtering system - Google Patents
A kind of adaptive RF filter and its adaptive RF filtering system Download PDFInfo
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- CN110474631A CN110474631A CN201910744651.4A CN201910744651A CN110474631A CN 110474631 A CN110474631 A CN 110474631A CN 201910744651 A CN201910744651 A CN 201910744651A CN 110474631 A CN110474631 A CN 110474631A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L5/00—Automatic control of voltage, current, or power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention provides a kind of adaptive RF filter and its adaptive RF filtering system, the adaptive RF filter includes: the first amplifier circuit, second amplifier circuit, voltage comparator circuit, frequency comparison circuit, NAND gate, enabled control circuit and voltage controlled filter, radio-frequency input signals is respectively connected to the voltage comparator circuit and frequency comparison circuit by the first amplifier circuit, the radio-frequency input signals is connected to second amplifier circuit by the voltage controlled filter, second amplifier circuit is respectively connected to the voltage comparator circuit and frequency comparison circuit, the voltage comparator circuit and frequency comparison circuit are respectively connected to the input terminal of the NAND gate, the output end of the NAND gate is connected to the control terminal of the voltage controlled filter by the enabled control circuit.The present invention realizes adaptive-filtering function, is controlled without external DA chip or MCU, and then its complexity tested and measured can be effectively reduced.
Description
Technical field
The present invention relates to a kind of radio-frequency filter more particularly to a kind of adaptive RF filters, and are related to using and be somebody's turn to do
The adaptive RF filtering system of adaptive RF filter.
Background technique
It communicates, in the systems such as radar, filter is most common indispensable one of component, is not needed for filtering out
Or interference signal.In broadband or multichannel communication, generally require to select corresponding passband frequency according to the centre frequency of signal
The filter of rate.And realize the method for the function it is usual there are two types of: the first is that different filters is selected by RF switch
Circuit, as shown in Figure 2；It is for second to change the component parameter in circuit, such as Fig. 3 by the methods of an electronically or mechanically controlling
With shown in Fig. 4.
Method shown in Fig. 2 is the filtering for switching RF switch by known radiofrequency signal to select different band connection frequencies
Device is to realize.But the disadvantages of this method is it is clear that i.e. with the increase of required channel, required filter quantity and RF switch
Quantity also will increase.
Method shown in Fig. 3 is to adjust the parameter value of filter internal device by control voltage to realize filter passband
Variation, voltage adjustment filter be also referred to as voltage controlled filter or voltage-controlled tunable filter, then further according to the centre frequency of signal
And it controls DA chip and exports the passband that corresponding voltage makes filter obtain corresponding frequencies.This method not only needs external MCU's
Operation intervention, and the band connection frequency precision of filter controls the precision of voltage, i.e., the precision of external DA chip dependent on it.Together
When, due to the discrete type of device, each voltage adjusts the band connection frequency of filter and homologous thread (the F/V song of control voltage
Line) equally there is discrete type, therefore each device needs its F/V curve of precise measurement before application, and needs accurate survey
Measure the corresponding temperature variations of F/V curve.
Method shown in Fig. 4 and Fig. 3 are substantially similar, and the device of the voltage tuning parameter of Fig. 3 is only changed to discrete
Several devices has realized higher Q value.For Fig. 3, the numerical control tunable filter of Fig. 4 has abandoned DA chip, but needs more controls
Signal processed, band connection frequency precision depends on the precision and number of combinations of discrete devices, therefore its number of devices is often more.And
Due to doing the access of variable element device usually using PIN diode, higher voltage (100V or so) is generally required.Equally
, due to the discrete type of device, the parameter of each numerical control tunable filter needs precise measurement, and the different variable elements of measurement
Combined parameter, test are inevitable complex.
Summary of the invention
The technical problem to be solved by the present invention is to need to provide a kind of radio-frequency filter that can be realized adaptation function,
And then by adaptively reducing the complexity tested and measured.
In this regard, the present invention provides a kind of adaptive RF filter, comprising: the first amplifier circuit, the second coupling are put
Big circuit, voltage comparator circuit, frequency comparison circuit, NAND gate, enabled control circuit and voltage controlled filter, radio-frequency input signals
The voltage comparator circuit and frequency comparison circuit, the radio-frequency input signals are respectively connected to by the first amplifier circuit
It is connected to second amplifier circuit by the voltage controlled filter, second amplifier circuit is respectively connected to institute
State voltage comparator circuit and frequency comparison circuit, the voltage comparator circuit and frequency comparison circuit be respectively connected to it is described with it is non-
The input terminal of door, the output end of the NAND gate are connected to the control of the voltage controlled filter by the enabled control circuit
End.
A further improvement of the present invention is that first amplifier circuit declines including the first signal coupler, first
Subtract device, the first amplifier, the first power splitter and the first power detector, the radio-frequency input signals passes through the first signal coupling
Clutch coupling input to first attenuator, first attenuator is connected to first function by first amplifier
Divide the input terminal of device, an output end of first power splitter is connected to an input terminal of the frequency comparison circuit, institute
The another output for stating the first power splitter is connected to one of the voltage comparator circuit by first power detector
Input terminal.
A further improvement of the present invention is that second amplifier circuit includes second signal coupler, second declines
Subtract device, the second amplifier, the second power splitter and the second power detector, the radio-frequency input signals passes through the voltage controlled filter
It is connected to the second signal coupler, the second signal coupler is connected to described second by second attenuator and puts
Big device, second amplifier are connected to the input terminal of second power splitter, and an output end of second power splitter connects
It is connected to another input terminal of the frequency comparison circuit, the another output of second power splitter passes through second function
Rate detector is connected to another input terminal of the voltage comparator circuit.
A further improvement of the present invention is that the output end of the voltage comparator circuit and the frequency comparison circuit is defeated
Outlet is respectively connected to two input terminals of the NAND gate.
A further improvement of the present invention is that the enabled control circuit includes that triangular-wave generator and voltage sample are kept
The output end of device, the NAND gate is connected to the voltage sample holding circuit, the voltage by the triangular-wave generator
Sampling hold circuit is connected to the control terminal of the voltage controlled filter.
A further improvement of the present invention is that the value of adjustment first attenuator and second attenuator, so that institute
It is consistent to state the signal magnitude that the first power detector and the second power detector receive, at this point, first power detector
Direct current signal corresponding with radio-frequency power size is exported to the voltage comparator circuit, the voltage ratio with the second power detector
Compared with circuit output high level；The frequency comparison circuit is received to be believed from the two-way of first power splitter and the second power splitter
Number, the two paths of signals frequency is consistent, and the frequency comparison circuit exports high level；The high level of the voltage comparator circuit output
The input terminal of the NAND gate is connected to the high level of frequency comparison circuit output, the NAND gate output low level is used
In the enable end for controlling the triangular-wave generator, the triangular-wave generator does not work, and the voltage sample holding circuit is protected
Hold original voltage.
A further improvement of the present invention is that when the band connection frequency of the voltage controlled filter shifts, described first
The signal that power detector receives is larger, and the signal that second power detector receives is smaller, the first power inspection
It is larger to survey device output direct current signal corresponding with radiofrequency signal size, the second power detector output and radiofrequency signal size
Corresponding direct current signal is smaller, and first power detector and the second power detector export direct current signal respectively and be input to institute
Voltage comparator circuit is stated, the voltage comparator circuit exports low level；The frequency comparison circuit, which receives, comes from first function
Divide the signal of device and the second power splitter, the main signal power of the first power splitter output is higher, the second power splitter output
Main signal power it is lower, frequency comparison circuit output low level or high level；The voltage comparator circuit exports low
The low level or high level of level and frequency comparison circuit output are respectively connected to the input terminal of the NAND gate, the NAND gate
High level is exported, the enable end for controlling the triangular-wave generator is enabled effectively, and the triangular-wave generator generates triangular wave and makees
For scanning signal, the voltage sample holding circuit samples triangular wave, and exports triangular wave to the voltage controlled filter control terminal,
The voltage controlled filter band connection frequency is set to change.
A further improvement of the present invention is that generating triangular wave as scanning signal when the triangular-wave generator vibrates
When, the voltage of the voltage sample holding circuit output changes with the voltage change of the triangular wave；When the triangular wave is sent out
When raw device stops oscillation and exports into high-impedance state, it is right that the voltage hold circuit output voltage remains triangular wave failure of oscillation moment institute
The voltage answered, the voltage controlled filter keep current band connection frequency.
A further improvement of the present invention is that the decaying respective frequencies curve of second attenuator and the voltage-controlled filtering
The characteristic of device is consistent.
The present invention also provides a kind of adaptive RF filtering systems, use adaptive RF filter as described above.
Compared with prior art, the beneficial effects of the present invention are: when voltage controlled filter is in suitable band connection frequency,
The voltage comparator circuit exports high level, and the frequency comparison circuit exports high level, so that the NAND gate exports
Low level controls the triangular-wave generator and does not work, and the voltage sample holding circuit keeps original voltage；When described voltage-controlled
When the band connection frequency of filter shifts, the low level of the voltage comparator circuit output, the frequency comparison circuit output
Low level or high level, so that the NAND gate exports high level, the enable end for controlling the triangular-wave generator is enabled
Effectively, the triangular-wave generator generates triangular wave, and the voltage sample holding circuit samples triangular wave and exports to the pressure
FILTER TO CONTROL end is controlled, so that the voltage controlled filter band connection frequency changes, and then realizes adaptive-filtering function, is not necessarily to
External DA chip or MCU are controlled, and the complexity of its control, test and measurement can be greatly lowered, can effectively drop
The cost of low product improves the production efficiency of product.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of an embodiment of the present invention；
Fig. 2 is the schematic illustration for selecting different filters by RF switch in the prior art；
Fig. 3 is the schematic illustration of voltage controlled filter of the present invention；
Fig. 4 is the schematic illustration of numerical control tunable filter in the prior art.
Specific embodiment
With reference to the accompanying drawing, preferably embodiment of the invention is described in further detail.
As shown in Figure 1, this example provides a kind of adaptive RF filter, comprising: the first amplifier circuit, the second coupling
Amplifying circuit, voltage comparator circuit, frequency comparison circuit, NAND gate, enabled control circuit and voltage controlled filter, radio frequency input letter
Number the voltage comparator circuit and frequency comparison circuit are respectively connected to by the first amplifier circuit, the radio frequency input letter
Number second amplifier circuit is connected to by the voltage controlled filter, second amplifier circuit is respectively connected to
The voltage comparator circuit and frequency comparison circuit, the voltage comparator circuit and frequency comparison circuit be respectively connected to it is described with
The input terminal of NOT gate, the output end of the NAND gate are connected to the control of the voltage controlled filter by the enabled control circuit
End.
As shown in Figure 1, the first amplifier circuit described in this example includes the first signal coupler, the first attenuator, first
Amplifier, the first power splitter and the first power detector, the radio-frequency input signals are coupled by first signal coupler
It is input to first attenuator, first attenuator is connected to the defeated of first power splitter by first amplifier
Enter end, an output end of first power splitter is connected to an input terminal of the frequency comparison circuit, first function
An input terminal for dividing the another output of device to be connected to the voltage comparator circuit by first power detector.
As shown in Figure 1, the second amplifier circuit described in this example includes second signal coupler, the second attenuator, second
Amplifier, the second power splitter and the second power detector, the radio-frequency input signals are connected to institute by the voltage controlled filter
Second signal coupler is stated, the second signal coupler is connected to second amplifier, institute by second attenuator
The input terminal that the second amplifier is connected to second power splitter is stated, an output end of second power splitter is connected to described
The another output of another input terminal of frequency comparison circuit, second power splitter passes through second power detector
It is connected to another input terminal of the voltage comparator circuit.
As shown in Figure 1, the output end of the output end of voltage comparator circuit described in this example and the frequency comparison circuit is distinguished
It is connected to two input terminals of the NAND gate.The enabled control circuit includes that triangular-wave generator and voltage sample are kept
The output end of device, the NAND gate is connected to the voltage sample holding circuit, the voltage by the triangular-wave generator
Sampling hold circuit is connected to the control terminal of the voltage controlled filter.
When the voltage controlled filter is in suitable band connection frequency, i.e., the voltage-controlled filtering is measured by Network Analyzer
The S parameter of device, and external plus adjustable dc voltage, to the voltage-controlled end of the voltage controlled filter, change DC voltage value makes described voltage-controlled
Filter passband frequency changes to the centre frequency of radio-frequency input signals, at this point, being determined as that the voltage controlled filter is in properly
Band connection frequency, S parameter refers to expressing using device by the scattering degree under the AC signal excitation with baud point
The feature of device, belongs to frequency parameter；This example adjusts the value of first attenuator and second attenuator, that is, increases and add deduct
The value of small first attenuator and second attenuator, so that first power detector and the second power detector connect
The signal magnitude received is consistent, and the band connection frequency is the centre frequency of bandpass filter passband, at this point, first power is examined
It surveys device and the second power detector exports direct current signal corresponding with radio-frequency power size to the voltage comparator circuit, the electricity
Pressure ratio is compared with circuit output high level；The frequency comparison circuit receives the two-way from first power splitter and the second power splitter
Signal, the two paths of signals frequency is consistent, and the frequency comparison circuit exports high level；The height electricity of the voltage comparator circuit output
The flat high level with frequency comparison circuit output is connected to the input terminal of the NAND gate, and the NAND gate exports low level
For controlling the enable end of the triangular-wave generator, the triangular-wave generator does not work, the voltage sample holding circuit
Keep original voltage.
When the band connection frequency of the voltage controlled filter shifts, i.e., the described voltage controlled filter is in inappropriate passband
Frequency, at this point, the signal that first power detector receives is larger, the signal that second power detector receives compared with
Small, it is larger that first power detector exports direct current signal corresponding with radiofrequency signal size, second power detector
It is smaller to export direct current signal corresponding with radiofrequency signal size, first power detector and the second power detector difference are defeated
Direct current signal is input to the voltage comparator circuit out, since the two direct current signal size (voltage) is inconsistent, the voltage ratio
Compared with circuit output low level；The frequency comparison circuit receives the signal from first power splitter and the second power splitter, institute
The main signal power for stating the output of the first power splitter is higher, and the main signal power of the second power splitter output is lower, the frequency
Comparison circuit exports low level or high level, and the main signal power of the even described second power splitter output is too low or spurious signal function
Rate is excessively high, then the frequency comparison circuit exports low level；If the main signal power of the second power splitter output is still able to satisfy
Then frequency comparison circuit exports high level to the frequency comparison circuit demand；The low level and frequency of the voltage comparator circuit output
The low level or high level of the output of rate comparison circuit are respectively connected to the input terminal of the NAND gate, the high electricity of the NAND gate output
The enable end of the flat control triangular-wave generator is enabled effectively, and the triangular-wave generator generates triangular wave as scanning letter
Number, the voltage sample holding circuit samples triangular wave, and exports triangular wave to the voltage controlled filter control terminal, makes the pressure
Control filter passband frequency changes.When being in suitable band connection frequency after voltage controlled filter variation, described in execution
Voltage controlled filter is in process when suitable band connection frequency, that is, adjusts first attenuator and second attenuator
Value, so that the consistent process of signal magnitude that first power detector and the second power detector receive.
It is worth together, it is system misjudgement in order to prevent that the frequency comparison circuit and the purpose of NAND gate, which is arranged, in this example
It is disconnected that the voltage controlled filter is allowed not to be in suitable band connection frequency.If without the frequency comparison circuit, and the NAND gate
Be changed to NOT gate, become the first coupler at this time and be coupled to after the first attenuator to input the first amplifier, realize after amplification by
First power splitter reaches the first power detector；Second coupler inputs the second amplifier after being coupled to the second attenuator,
It realizes and reaches the second power detector, the main signal power of first power detector and institute by the second power splitter after amplifying
The spurious signal power for stating the second power detection is identical, and NOT gate exports low level, and triangular-wave generator stops working, such
Words, will allow system to be mistakenly considered voltage controlled filter at this time and be in correct band connection frequency.
Therefore, the frequency comparison circuit and the NAND gate is added in this example, does not conform to even if the voltage controlled filter is in
Suitable band connection frequency, main signal decaying is excessive, and the frequency comparison circuit exports low level, and the NAND gate exports high level,
The triangular-wave generator work, which still generates triangular voltage sweep voltage, makes the voltage controlled filter change band connection frequency, Jin Erneng
Enough adaptive changes and adjustment, until reaching suitable band connection frequency.
On this basis, at the voltage-controlled end of the triangular-wave generator and the voltage controlled filter, voltage sample is added and protects
Circuit is held, its role is to: when the triangular-wave generator, which vibrates, generates triangular wave as scanning signal, the voltage sample
The voltage of holding circuit output changes with the voltage change of the triangular wave；When the triangular-wave generator stops oscillation and defeated
When out at high-impedance state, the voltage hold circuit output voltage remains voltage corresponding to the triangular wave failure of oscillation moment, the pressure
Control filter keeps current band connection frequency.The voltage controlled filter is also referred to as voltage-controlled tunable filter or voltage adjustment filter.
This example according to the band connection frequency of the adaptively selected voltage-controlled tunable filter of input signal due to that can compare
Traditional voltage-controlled and numerical control tunable filter, without the parameter (F/V because of device parameters discreteness problem to each filter
Curve) do accurate measurement.And due to its adaptivity, is controlled, can disposably be adjusted without external DA chip or MCU
After device parameters, adjusting device parameter mainly includes the device parameters of voltage controlled filter.First attenuator parameter and the second decaying
Device parameter, the device parameters development phase of voltage controlled filter is fixed after debugging, then adjusts the first attenuator through the above way
Parameter and the second attenuator parameter make up the discrete type of voltage controlled filter parameter, and batch micro operations simultaneously directly apply to circuit.
In addition, it should also be mentioned that the decaying respective frequencies curve of the second attenuator described in this example with it is described voltage-controlled
The characteristic of filter is consistent but slope is on the contrary, the pass band insertion loss of i.e. voltage controlled filter corresponds to input lower frequency A's
Signal is 3dB, and the signal of corresponding input upper frequency B is 4dB, and the second attenuator is then just on the contrary, second attenuator
The signal of the corresponding input lower frequency A of pad value be 4dB, the signal of corresponding input upper frequency B is 3dB；This second decaying
Device can be made of radio frequency amplitude equalizing circuit.
The reason of this example is arranged in this way is: passband insertion of the voltage controlled filter in the frequency range of entire channel
Loss be it is inconsistent, therefore, this example makes up the voltage-controlled filtering by adjusting first attenuator and the second attenuator
The pass band insertion loss of device, so that the voltage controlled filter is in suitable band connection frequency, first power detector and
The main signal power that two power detectors receive is consistent；Therefore the curve of the decaying respective frequencies of second attenuator should be with
The characteristic of filter is consistent, and then solves pass band insertion loss of the voltage controlled filter in the frequency range of entire channel
Inconsistent technical bottleneck.
With present technical staff is intended to analyze channel situation by way of FFT select different filters compared with, this
Apply without high-speed ADC and MUC and related algorithm, but in such a way that hardware device/circuit compares relevant parameter
The adaptivity of radio-frequency filter is realized, applicable range is wide.
This example also provides a kind of adaptive RF filtering system, uses adaptive RF filter as described above.
In conclusion the output of voltage comparator circuit described in this example is high when voltage controlled filter is in suitable band connection frequency
Level, the frequency comparison circuit export high level, so that the NAND gate exports low level, control the triangular wave hair
Raw device does not work, and the voltage sample holding circuit keeps original voltage；When the band connection frequency of the voltage controlled filter occurs partially
When shifting, the low level of the voltage comparator circuit output, the frequency comparison circuit exports low level or high level, so that
The NAND gate exports high level, and the enable end for controlling the triangular-wave generator is enabled effectively, and the triangular-wave generator produces
Raw triangular wave, the voltage sample holding circuit sample triangular wave and export to the voltage controlled filter control terminal, so that described
Voltage controlled filter band connection frequency changes, and then realizes adaptive-filtering function, is controlled without external DA chip or MCU
System can be greatly lowered the complexity of its control, test and measurement, can be effectively reduced the cost of product, improve product
Production efficiency.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, In
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of adaptive RF filter characterized by comprising the first amplifier circuit, the second amplifier circuit,
Voltage comparator circuit, frequency comparison circuit, NAND gate, enabled control circuit and voltage controlled filter, radio-frequency input signals pass through the
One amplifier circuit is respectively connected to the voltage comparator circuit and frequency comparison circuit, and the radio-frequency input signals passes through institute
It states voltage controlled filter and is connected to second amplifier circuit, second amplifier circuit is respectively connected to the voltage
Comparison circuit and frequency comparison circuit, the voltage comparator circuit and frequency comparison circuit are respectively connected to the defeated of the NAND gate
Enter end, the output end of the NAND gate is connected to the control terminal of the voltage controlled filter by the enabled control circuit.
2. adaptive RF filter according to claim 1, which is characterized in that first amplifier circuit includes
First signal coupler, the first attenuator, the first amplifier, the first power splitter and the first power detector, the radio frequency input
Signal passes through described first by the first signal coupler coupling input to first attenuator, first attenuator
Amplifier is connected to the input terminal of first power splitter, and an output end of first power splitter is connected to the frequency ratio
Compared with an input terminal of circuit, the another output of first power splitter is connected to institute by first power detector
State an input terminal of voltage comparator circuit.
3. adaptive RF filter according to claim 2, which is characterized in that second amplifier circuit includes
Second signal coupler, the second attenuator, the second amplifier, the second power splitter and the second power detector, the radio frequency input
Signal is connected to the second signal coupler by the voltage controlled filter, and the second signal coupler passes through described second
Attenuator is connected to second amplifier, and second amplifier is connected to the input terminal of second power splitter, and described
One output end of two power splitters is connected to another input terminal of the frequency comparison circuit, second power splitter it is another
A output end is connected to another input terminal of the voltage comparator circuit by second power detector.
4. adaptive RF filter according to claim 3, which is characterized in that the output end of the voltage comparator circuit
Two input terminals of the NAND gate are respectively connected to the output end of the frequency comparison circuit.
5. adaptive RF filter according to claim 3 or 4, which is characterized in that the enabled control circuit includes
Triangular-wave generator and voltage sample retainer, the output end of the NAND gate are connected to described by the triangular-wave generator
Voltage sample holding circuit, the voltage sample holding circuit are connected to the control terminal of the voltage controlled filter.
6. adaptive RF filter according to claim 5, which is characterized in that adjustment first attenuator and described
The value of second attenuator, so that the signal magnitude that first power detector and the second power detector receive is consistent, this
When, first power detector and the second power detector export direct current signal corresponding with radio-frequency power size to the electricity
Comparison circuit is pressed, the voltage comparator circuit exports high level；The frequency comparison circuit, which receives, comes from first power splitter
With the two paths of signals of the second power splitter, the two paths of signals frequency is consistent, and the frequency comparison circuit exports high level；The voltage
The high level of comparison circuit output and the high level of frequency comparison circuit output are connected to the input terminal of the NAND gate, institute
The enable end that NAND gate output low level is used to control the triangular-wave generator is stated, the triangular-wave generator does not work, institute
It states voltage sample holding circuit and keeps original voltage.
7. adaptive RF filter according to claim 6, which is characterized in that when the passband frequency of the voltage controlled filter
When rate shifts, the signal that first power detector receives is larger, the letter that second power detector receives
Number smaller, first power detector exports that direct current signal corresponding with radiofrequency signal size is larger, and second power is examined
It is smaller to survey device output direct current signal corresponding with radiofrequency signal size, first power detector and the second power detector point
Not Shu Chu direct current signal be input to the voltage comparator circuit, the voltage comparator circuit exports low level；The frequency compares
Circuit receives the signal from first power splitter and the second power splitter, the main signal power of first power splitter output compared with
The main signal power of height, the second power splitter output is lower, the frequency comparison circuit output low level or high level；It is described
The low level and the low level that exports of frequency comparison circuit or high level of voltage comparator circuit output be respectively connected to described in it is non-
The input terminal of door, the NAND gate export high level, and the enable end for controlling the triangular-wave generator is enabled effectively, the triangle
Wave producer generates triangular wave as scanning signal, and the voltage sample holding circuit samples triangular wave, and exports triangular wave extremely
The voltage controlled filter control terminal makes the voltage controlled filter band connection frequency change.
8. adaptive RF filter according to claim 7, which is characterized in that produced when the triangular-wave generator vibrates
When raw triangular wave is as scanning signal, the voltage that the voltage sample holding circuit exports with the voltage change of the triangular wave and
Variation；When the triangular-wave generator stops oscillation and exports into high-impedance state, the voltage hold circuit output voltage is kept
For voltage corresponding to the triangular wave failure of oscillation moment, the voltage controlled filter keeps current band connection frequency.
9. adaptive RF filter according to claim 3 or 4, which is characterized in that the decaying of second attenuator
Respective frequencies curve and the characteristic of the voltage controlled filter are consistent.
10. a kind of adaptive RF filtering system, which is characterized in that use it is as claimed in any one of claims 1 to 9 from
Adapt to radio-frequency filter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019189A (en) * | 2020-09-10 | 2020-12-01 | 电子科技大学 | General design method of EMI filter for multiple modules of electric automobile |
| CN114895102A (en) * | 2022-02-25 | 2022-08-12 | 电子科技大学 | High-isolation input/output stage large dynamic range power detection circuit |
| CN117650783A (en) * | 2024-01-30 | 2024-03-05 | 成都世源频控技术股份有限公司 | Miniaturized agile frequency synthesis circuit |
| CN117650783B (en) * | 2024-01-30 | 2024-04-19 | 成都世源频控技术股份有限公司 | Miniaturized agile frequency synthesis circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050083137A1 (en) * | 2003-10-18 | 2005-04-21 | Samsung Electronics Co., Ltd. | Frequency synthesizer using a wide-band voltage controlled oscillator and a fast adaptive frequency calibration method |
| US20120119790A1 (en) * | 2010-11-17 | 2012-05-17 | Industrial Technology Research Institute | Dynamic comparator based comparison system |
| CN105897203A (en) * | 2015-02-15 | 2016-08-24 | 天工方案公司 | Radio-frequency power amplifiers driven by boost converter |
| CN106656059A (en) * | 2016-08-11 | 2017-05-10 | 南京物联传感技术有限公司 | Bidirectional radio-frequency amplifier input-output reverse connection protection circuit and method thereof |
| CN109167572A (en) * | 2018-10-12 | 2019-01-08 | 南京屹信航天科技有限公司 | It is a kind of for minimizing the frequency synthesizer of ODU receiving channel |
-
2019
- 2019-08-13 CN CN201910744651.4A patent/CN110474631B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050083137A1 (en) * | 2003-10-18 | 2005-04-21 | Samsung Electronics Co., Ltd. | Frequency synthesizer using a wide-band voltage controlled oscillator and a fast adaptive frequency calibration method |
| US20120119790A1 (en) * | 2010-11-17 | 2012-05-17 | Industrial Technology Research Institute | Dynamic comparator based comparison system |
| CN105897203A (en) * | 2015-02-15 | 2016-08-24 | 天工方案公司 | Radio-frequency power amplifiers driven by boost converter |
| CN106656059A (en) * | 2016-08-11 | 2017-05-10 | 南京物联传感技术有限公司 | Bidirectional radio-frequency amplifier input-output reverse connection protection circuit and method thereof |
| CN109167572A (en) * | 2018-10-12 | 2019-01-08 | 南京屹信航天科技有限公司 | It is a kind of for minimizing the frequency synthesizer of ODU receiving channel |
Non-Patent Citations (1)
| Title |
|---|
| 侯靖: "线性化功率放大器设计", 《中国硕士学位论文全文数据库信息科技辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019189A (en) * | 2020-09-10 | 2020-12-01 | 电子科技大学 | General design method of EMI filter for multiple modules of electric automobile |
| CN114895102A (en) * | 2022-02-25 | 2022-08-12 | 电子科技大学 | High-isolation input/output stage large dynamic range power detection circuit |
| CN117650783A (en) * | 2024-01-30 | 2024-03-05 | 成都世源频控技术股份有限公司 | Miniaturized agile frequency synthesis circuit |
| CN117650783B (en) * | 2024-01-30 | 2024-04-19 | 成都世源频控技术股份有限公司 | Miniaturized agile frequency synthesis circuit |
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