CN201674523U - Radio frequency predistortion circuit, power amplifying device and repeater - Google Patents
Radio frequency predistortion circuit, power amplifying device and repeater Download PDFInfo
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- CN201674523U CN201674523U CN2010201454865U CN201020145486U CN201674523U CN 201674523 U CN201674523 U CN 201674523U CN 2010201454865 U CN2010201454865 U CN 2010201454865U CN 201020145486 U CN201020145486 U CN 201020145486U CN 201674523 U CN201674523 U CN 201674523U
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Abstract
The utility model is applicable to the field of mobile communication, and provides a radio frequency predistortion circuit and a power amplifying device; the radio frequency predistortion circuit comprises a link unit, an MCU control module, a detection module and a predistortion processing module; the input end and the output end of the predistortion processing module are connected to the second control end of the link unit, and the feedback end of the predistortion processing module is connected with the feedback output end of a power amplifying circuit; and the input control end of the MCU control module is connected to the output end of the detection module, the first output control end is connected to a third control end of the link unit, and the second output control end is connected to the control end of the predistortion processing module. The radio frequency predistortion circuit adopts the MCU control module and the predistortion processing module to realize predistortion processing, adjusts the linearity of power amplification, and fully meets the high linearity and high efficiency requirements of power amplification; and the radio frequency predistortion circuit has simple structure, small size and low cost, realizes intelligent debugging through a computer and other terminal tools, and facilitates mass production and application.
Description
Technical field
The utility model belongs to moving communicating field, relates in particular to a kind of radio frequency distortion circuit, power amplifier device and repeater.
Background technology
Wireless communication system has greatly improved the utilance of frequency spectrum resource owing to adopted the modulation system (as QPSK, QAM, OFDM etc.) of various non-constant envelopes.But non-constant envelope signal is different from constant envelope signals, and radio-frequency (RF) power amplification can not be pulled to compressive state, otherwise can produce linear distortion.In order to obtain high linearity and high efficiency radio-frequency (RF) power amplification, existing technology mainly contains: back-off technology, feedback technique, feedforward and pre-distortion technology etc.
The back-off technology is simple, the most reliable a kind of linearisation measure, is high-power power tube derate is used, promptly select for use the bigger power tube of power to do the small-power power tube and use, but shortcoming such as this technology exists power utilization low, and efficient is low.
The feedback technique limited bandwidth, poor stability.It is higher that feed-forward technique has the linearisation index, the advantage of bandwidth of operation broad, but it requires extra error amplifying circuit and complicated control circuit, causes its production cost height, and the debugging trouble is unfavorable for producing in batches.
Pre-distortion technology is divided into digital baseband predistortion and radio frequency distortion again; It is remarkable that the digital baseband predistortion is improved the power amplifier linear effects, but because its complex structure, bulky, and the shortcoming that cost is high is difficult for being used to require small size and cheaply in the direct discharging station.Existing radio frequency distortion technology is that the distortion radiofrequency signal that final stage is exported is coupled out a part, handle through predistortion circuit again, signal after the processing eliminates distortion component to obtain the optimum linearity index synthesizing with the input of power amplifier or the signal of output.This method circuit is simple, and power consumption is less, bandwidth of operation broad etc., but the hard-wired radio frequency distortion technological debugging of this pure usefulness difficulty is big, is unfavorable for producing in batches.
The utility model content
The purpose of this utility model is to provide a kind of linearity and the efficient and low radio frequency distortion circuit of cost that can improve power amplifier.
The utility model is achieved in that a kind of radio frequency distortion circuit, comprising:
Link unit, its input are as the input of described radio frequency distortion circuit, and the output of described link unit connects the input of power amplifier;
Detection module, its input are connected to first control end of described link unit;
Input/output terminal is connected to second control end of described link unit, feedback end is connected to the feedback output end of described power amplifier, the signal that the feedback signal of the feedback output end of described power amplifier output and second control end of described link unit are exported compares calculating, according to result of calculation output distortion control signal and pre-distortion module that the linearity of described power amplifier is adjusted; And
To the MCU control module that the feedback signal of the feedback output end of described power amplifier output is controlled, its input control end is connected to the output of described detection module; First output control terminal of MCU control module is connected to the 3rd control end of described link unit; Second output control terminal of MCU control module is connected to the control end of described pre-distortion module.
Further, described link unit comprises: first coupler of Lian Jieing, first numerical-control attenuator, voltage-controlled attenuator, class-a amplifier, second coupler, the 3rd coupler, delayer and the 4th coupler in turn; The coupling output of described first coupler is as first control end of described link unit; The coupling output of described the 3rd coupler and the couple input of described the 4th coupler are as second control end of described link unit; The control end of described first numerical-control attenuator is as the 3rd control end of described link unit.
Further, described link unit also comprises: be connected the temperature compensation attenuator between voltage-controlled attenuator and the class-a amplifier.
Further, described first coupler is a capacity coupler; Described second coupler is a microstrip coupler.
Further, described the 3rd coupler and described the 4th coupler are the coupler of 10dB.
Further, described delayer is a radio frequency cable.
Further, described pre-distortion module comprises: first impedance transformer, predistortion processor, second impedance transformer, the 3rd impedance transformer and second numerical-control attenuator;
The input of described first impedance transformer is connected with the coupled end of described the 3rd coupler;
The output of described second impedance transformer is connected with the coupled end of described the 4th coupler;
The feedback input end of described second numerical-control attenuator is connected with the feedback output end of described power amplifier, and the control input end of described second numerical-control attenuator is connected with described MCU control module;
The input of described the 3rd impedance transformer is connected to the output of described second numerical-control attenuator;
The first input end of described predistortion processor is connected to the output of described first impedance transformer, second input of described predistortion processor is connected to the output of described the 3rd impedance transformer, the 3rd input of described predistortion processor is connected with described MCU control module, and the output of described predistortion processor is connected to the input of described second impedance transformer.
Further, described detection module comprises: the first detector of Lian Jieing and first comparison amplifier in turn; And the second detector and second comparison amplifier that connect in turn;
The input of described first detector is connected with the coupled end of described second coupler, and the output of described first comparison amplifier is connected with described voltage-controlled attenuator;
The input of described second detector is connected with the coupled end of described first coupler, and the output of described second comparison amplifier is connected with described MCU control module.
Another purpose of the present utility model is to provide a kind of power amplifier device, and it comprises radio frequency distortion circuit and the power amplifier that is connected with described radio frequency distortion circuit, and described radio frequency distortion circuit is above-mentioned radio frequency distortion circuit.
Another purpose of the present utility model is to provide a kind of repeater, and described repeater comprises above-mentioned power amplifier device.
The radio frequency distortion circuit that the utility model provides adopts MCU control module and pre-distortion module to realize pre-distortion, and the linearity of power amplifier is adjusted, and satisfies the requirement of the high linear high-efficiency rate of power amplifier fully; This radio frequency distortion circuit structure is simple, volume is little, cost is low and by tool terminal intelligent regulators such as computers, be easy to production in enormous quantities and application.
Description of drawings
Fig. 1 is the modular structure schematic diagram of the power amplifier device that provides of the utility model embodiment;
Fig. 2 is the modular structure schematic diagram of the radio frequency distortion circuit that provides of the utility model embodiment;
Fig. 3 is the modular structure schematic diagram of the power amplifier that provides of the utility model embodiment;
Fig. 4 is the workflow diagram of the radio frequency distortion circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The radio frequency distortion circuit that the utility model provides adopts MCU control module and pre-distortion module to realize pre-distortion, and the linearity of power amplifier is adjusted, and satisfies the requirement of the high linear high-efficiency rate of power amplifier fully; This radio frequency distortion circuit structure is simple, volume is little, cost is low and by tool terminal intelligent regulators such as computers, be easy to production in enormous quantities and application.
The radio frequency distortion circuit that the utility model embodiment provides is mainly used in the power amplifier device linearity to power amplifier and adjusts; The modular structure schematic diagram of power amplifier device for convenience of explanation, only shows the part relevant with the utility model as shown in Figure 1, and details are as follows.
Power amplifier device comprises: radio frequency distortion circuit 10 and the power amplifier 20 that is connected with radio frequency distortion circuit 10; Wherein, the distortion of power amplifier is offset in the non-linear opposite distortion of compression that the transmission curve that gains is caused that radio frequency distortion circuit 10 produces a kind of and power amplifier 20, if the transfer function of two kinds of distortions is can be fully oppositely consistent, what then obtain at last is the amplitude transfer function (comprise three rank, five rank, seven rank and more than) of a linearity.To the processing of phase place too, radio frequency distortion circuit 10 produce one with the opposite transfer function of power amplifier 20 self transmission functions, offset the phase distortion of power amplifier, obtain linear transmission of phase function (comprise three rank, five rank, seven rank and more than) at last.
The radio frequency distortion circuit that the utility model embodiment provides can be used with any power amplifier, the adjacent channel power that can improve power amplifier well compares ACPR, also has the real-time adaptive function, can automatically the linearity of power amplifier be adjusted to optimum state along with the change of power and frequency, also greatly improve the whole efficiency of power amplifier simultaneously, satisfied the engineering demands of applications fully.
In the utility model embodiment, radio frequency distortion circuit 10 comprises: link unit 1, MCU control module 2, detection module 4 and pre-distortion module 3; The input of link unit 1 receives the RFin signal as the input of radio frequency distortion circuit 10, and the output of link unit 1 connects the input of power amplifier; The input of detection module 4 is connected to first control end of described link unit, and the input/output terminal of pre-distortion module 3 is connected to second control end of link unit 1, and the feedback end of pre-distortion module is connected to the feedback output end of power amplifier 20; The signal that pre-distortion module 3 is exported the feedback signal of the feedback output end of power amplifier 20 output and second control end of link unit 1 compares calculating, adjusts according to result of calculation output distortion control signal and to the linearity of power amplifier 20; The input control end of MCU control module 2 is connected to the output of detection module 4, first output control terminal of MCU control module 2 is connected to the 3rd control end of link unit 1, and second output control terminal of MCU control module 2 is connected to the control end of pre-distortion module 3; Link unit 1 is controlled the signal of second control end output of link unit 1 according to the control signal of first output control terminal output of MCU control module 2; The feedback signal of the feedback output end of 2 pairs of power amplifiers 20 of MCU control module output is controlled and frequency, bandwidth or the operating state of the input signal of pre-distortion module 3 is detected.
In the utility model, radio frequency distortion circuit 10 has automatic gain control function, and the maximum gain of whole link is 15, and the initial value of gain is 0.This radio frequency distortion circuit 10 is connected to tool terminal adjustment such as computer gain, with the repeater that adapts to any different system or original products scheme of base station.
Fig. 2 shows the modular structure schematic diagram of link unit 1, MCU control module 2, detection module 4 and pre-distortion module 3 in the radio frequency distortion circuit 10 that the utility model embodiment provides; For convenience of explanation, only show the part relevant with the utility model, details are as follows.
Because the gain fluctuation of radio frequency distortion circuit 10 under high and low temperature environment is little, therefore can adopt hardware compensating.Particularly, increase temperature compensation attenuator 14 in link unit 1, it is connected between voltage-controlled attenuator 13 and the class-a amplifier 15; Increase after the temperature compensation attenuator 14 gain stabilization of radio frequency distortion circuit 10; And temperature compensation attenuator 14 costs are very low.
Wherein, first coupler 11 can adopt capacity coupler; Second coupler 16 is a microstrip coupler; The 3rd coupler 17 and the 4th coupler 19 are the coupler of 10dB.
Wherein, can to adopt step value be that 1dB and control range are the RF digital attenuator of 0-31dB to first numerical-control attenuator 12.Particularly, can select model for use is that the chip of PE4306 is realized.
Wherein, voltage-controlled attenuator 13 can adopt the radio frequency attenuator with low-loss, high IIP3.Particularly, can select model for use is that the chip of HSMP-3816 is realized.Adopt voltage-controlled attenuator 13 can prevent that the excessive or fluctuation of input signal from impact for whole link and radio frequency distortion circuit 10.
Wherein, class-a amplifier 15 can adopt low-loss, and high OIP3 and gain are the gain tube of 22dB, make it be operated in category-A.And the initial value of the gain of whole radio frequency link is controlled in 0dB.
Wherein, delayer 18 can be for having the radio frequency cable of 2-5ns.Delayer 18 is to be used for compensating radio frequency distortion circuit 10 inter-process time delays, makes the predistortion output signal radio-frequency input signals corresponding with this distorted signal synchronous.
In the utility model, pre-distortion module 3 comprises: first impedance transformer 31, predistortion processor 32, second impedance transformer 33, the 3rd impedance transformer 34 and second numerical-control attenuator 35; Wherein the input of first impedance transformer 31 is connected with the coupled end of the 3rd coupler 17; The output of second impedance transformer 33 is connected with the coupled end of the 4th coupler 19; The feedback input end of second numerical-control attenuator 35 is connected with the feedback output end of power amplifier 20, and the control input end of second numerical-control attenuator 35 is connected with MCU control module 2; The input of the 3rd impedance transformer 34 is connected to the output of second numerical-control attenuator 35; The first input end of predistortion processor 32 is connected to the output of first impedance transformer 31, second input of predistortion processor 32 is connected to the output of the 3rd impedance transformer 34, the 3rd input of predistortion processor 32 is connected with MCU control module 2, and the output of predistortion processor 32 is connected to the input of second impedance transformer 33.
Wherein, pre-distortion module 3 can adopt adaptive algorithm, makes radio frequency distortion circuit 10 have the real-time adaptive function.
In the utility model, detection module 4 comprises: the first detector 41 of Lian Jieing and first comparison amplifier 42 in turn; And the second detector 43 and second comparison amplifier 44 that connect in turn; The input of first detector 41 is connected with the coupled end of second coupler 16, and the output of first comparison amplifier 42 is connected with voltage-controlled attenuator 13; The input of second detector 43 is connected with the coupled end of first coupler 11, and the output of second comparison amplifier 44 is connected with MCU control module 2.
In the utility model, input signal RFin enters first coupler 11, and the signal of coupling small part energy enters detection module 4 and carries out the detection amplification.Signal from 11 outputs of first coupler enters into first numerical-control attenuator 12, is used for the intensity of control signal; Enter voltage-controlled attenuator 13 (using the voltage control signal strength signal intensity) more successively, temperature compensation attenuator 14 (being used to compensate gain value of varying with temperature of whole link), class-a amplifier 15 (signal is amplified), second coupler 16 (the coupling unit signal is to the detection module), the 3rd coupler 17 (the coupling unit signal is to the pre-distortion module), delayer 18 (being used to produce signal time delay), output signal to power amplifier 20 behind the 4th coupler 19 (outputing signal to after the pre-distortion resume module the 4th coupler).Pre-distortion module 3 compares computing by the signal RFfb and the input signal (the 3rd coupler 17 outputs to the signal of first impedance transformer 31) of power amplifier feedback, produces the distortion that power amplifier is offset in an opposite distortion with the non-linear compression that gain transfer function is caused of power amplifier.If the transfer function of two kinds of distortions is fully oppositely consistent, then last power amplifier output obtains to such an extent that be the transfer function of a linearity, thereby has reached the purpose that improves the power amplifier linearity.MCU control module 2 can detect the feedback signal and the input signal of pre-distortion module automatically, if signal strength signal intensity is excessive or too small, can control by first numerical-control attenuator 12 and second numerical-control attenuator 35; Whether MCU control module 2 can be controlled pre-distortion module 3 automatically in running order, and too small when the power amplifier power output, and power amplifier self can satisfy under the situation of linear index, and pre-distortion module 3 is in off position; MCU control module 2 can also detect the frequency of the input signal of predistortion module, bandwidth and operating state.
In the utility model, the modular structure of power amplifier 20 as shown in Figure 3, power amplifier 20 comprises: coupler 202, attenuator 203 and power amplifier 201; The input PAIN of power amplifier 201 is connected to the output of link unit 1, and the output of power amplifier 201 is connected to the input of coupler 202, the output output PAOUT signal of coupler 202; The coupled end of coupler 202 is connected to the input of attenuator 203, and the output output feedback signal RFin of attenuator 203 also is connected to the feedback input end of pre-distortion module 3.
The radio frequency distortion circuit that the utility model embodiment provides has realized that input power detection, predistortion processor input power detect, automatic electric-level control (ALC) and automatically reset function with utilizing technical intelligence that software and hardware combines.Make the diverse in function and the dependable performance of this radio frequency distortion circuit stable, can adapt to the power amplifier scheme that requires high linear high-efficiency rate fully and use; And this modular structure is simple, body is less, cost is low.
For the radio frequency distortion circuit 10 that illustrates that further the utility model provides, existing in conjunction with Fig. 2, Fig. 3 and Fig. 4 in detail its operation principle to be described in detail as follows:
In step S11, MCU control module 2 and predistortion processor 32 are carried out initialization;
In step S12, from power amplifier 201 output signals, through coupler 202, be coupled out a part of signal to attenuator 203, this signal is that the signal RFfb of power amplifier feedback inputs in the predistortion processor 32 through second numerical-control attenuator 35 and the 3rd impedance transformer 34;
In step S13, predistortion processor 32 is making comparisons from the signal and the input signals of power amplifier feedback, and the query display look-up table (Look-Up-Table LUT), calculates according to adaptive algorithm again;
In step S14, obtain best correction coefficient;
In step S15, generate the correction function with power amplifier nonlinear distortion opposite signal, promptly get the transfer function of amplitude and phase place with power amplifier nonlinear distortion opposite signal;
In step S16, produce pre-distorted signals;
In step S17, judge whether it is that change has taken place for frequency, bandwidth or power, if then turn back to step S13; If not, then export through second impedance transformer, 33 to the 4th couplers 19, the pre-distorted signals of final output is to PAIN, thereby reaches the function of improving power amplifier ACPR and efficient.
The radio frequency distortion circuit that the utility model provides adopts MCU control module and pre-distortion module to realize pre-distortion, and the linearity of power amplifier is adjusted, and satisfies the requirement of the high linear high-efficiency rate of power amplifier fully; This radio frequency distortion circuit structure is simple, volume is little, cost is low and by tool terminal intelligent regulators such as computers, be easy to production in enormous quantities and application.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. a radio frequency distortion circuit is characterized in that, comprising:
Link unit, its input are as the input of described radio frequency distortion circuit, and the output of described link unit connects the input of power amplifier;
Detection module, its input are connected to first control end of described link unit;
Input/output terminal is connected to second control end of described link unit, feedback end is connected to the feedback output end of described power amplifier, the signal that the feedback signal of the feedback output end of described power amplifier output and second control end of described link unit are exported compares calculating, according to result of calculation output distortion control signal and pre-distortion module that the linearity of described power amplifier is adjusted; And
To the MCU control module that the feedback signal of the feedback output end of described power amplifier output is controlled, its input control end is connected to the output of described detection module; First output control terminal of MCU control module is connected to the 3rd control end of described link unit; Second output control terminal of MCU control module is connected to the control end of described pre-distortion module.
2. radio frequency distortion circuit as claimed in claim 1 is characterized in that, described link unit comprises:
First coupler of Lian Jieing, first numerical-control attenuator, voltage-controlled attenuator, class-a amplifier, second coupler, the 3rd coupler, delayer and the 4th coupler in turn;
The coupling output of described first coupler is as first control end of described link unit;
The coupling output of described the 3rd coupler and the couple input of described the 4th coupler are as second control end of described link unit;
The control end of described first numerical-control attenuator is as the 3rd control end of described link unit.
3. radio frequency distortion circuit as claimed in claim 2 is characterized in that, described link unit also comprises: be connected the temperature compensation attenuator between voltage-controlled attenuator and the class-a amplifier.
4. radio frequency distortion circuit as claimed in claim 2 is characterized in that, described first coupler is a capacity coupler; Described second coupler is a microstrip coupler.
5. radio frequency distortion circuit as claimed in claim 2 is characterized in that, the coupler that described the 3rd coupler and described the 4th coupler are 10dB.
6. radio frequency distortion circuit as claimed in claim 2 is characterized in that, described delayer is a radio frequency cable.
7. radio frequency distortion circuit as claimed in claim 2 is characterized in that, described pre-distortion module comprises:
First impedance transformer, predistortion processor, second impedance transformer, the 3rd impedance transformer and second numerical-control attenuator;
The input of described first impedance transformer is connected with the coupled end of described the 3rd coupler;
The output of described second impedance transformer is connected with the coupled end of described the 4th coupler;
The feedback input end of described second numerical-control attenuator is connected with the feedback output end of described power amplifier, and the control input end of described second numerical-control attenuator is connected with described MCU control module;
The input of described the 3rd impedance transformer is connected to the output of described second numerical-control attenuator;
The first input end of described predistortion processor is connected to the output of described first impedance transformer, second input of described predistortion processor is connected to the output of described the 3rd impedance transformer, the 3rd input of described predistortion processor is connected with described MCU control module, and the output of described predistortion processor is connected to the input of described second impedance transformer.
8. radio frequency distortion circuit as claimed in claim 2 is characterized in that, described detection module comprises: the first detector of Lian Jieing and first comparison amplifier in turn; And the second detector and second comparison amplifier that connect in turn;
The input of described first detector is connected with the coupled end of described second coupler, and the output of described first comparison amplifier is connected with described voltage-controlled attenuator;
The input of described second detector is connected with the coupled end of described first coupler, and the output of described second comparison amplifier is connected with described MCU control module.
9. power amplifier device, it comprises radio frequency distortion circuit and the power amplifier that is connected with described radio frequency distortion circuit, it is characterized in that, described radio frequency distortion circuit is each described radio frequency distortion circuit of claim 1-8.
10. a repeater is characterized in that, described repeater comprises the described power amplifier device of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201454865U CN201674523U (en) | 2010-03-25 | 2010-03-25 | Radio frequency predistortion circuit, power amplifying device and repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201454865U CN201674523U (en) | 2010-03-25 | 2010-03-25 | Radio frequency predistortion circuit, power amplifying device and repeater |
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| CN201674523U true CN201674523U (en) | 2010-12-15 |
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| CN2010201454865U Expired - Fee Related CN201674523U (en) | 2010-03-25 | 2010-03-25 | Radio frequency predistortion circuit, power amplifying device and repeater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN103327600A (en) * | 2012-07-30 | 2013-09-25 | 武汉东为科技有限公司 | Automatic control device and method of radio frequency link gains |
| CN104201994A (en) * | 2013-03-15 | 2014-12-10 | 美国亚德诺半导体公司 | Radio frequency domain digital pre-distortion |
| CN109408974A (en) * | 2018-10-30 | 2019-03-01 | 中国电子科技集团公司第十三研究所 | Power device preparation method |
| CN112993503A (en) * | 2019-12-17 | 2021-06-18 | 伊兰泰克公司 | 5G universal passive intermodulation distortion coupling mode filter and filtering method |
-
2010
- 2010-03-25 CN CN2010201454865U patent/CN201674523U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103327600A (en) * | 2012-07-30 | 2013-09-25 | 武汉东为科技有限公司 | Automatic control device and method of radio frequency link gains |
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN102946281B (en) * | 2012-11-01 | 2015-05-13 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN104201994A (en) * | 2013-03-15 | 2014-12-10 | 美国亚德诺半导体公司 | Radio frequency domain digital pre-distortion |
| CN109408974A (en) * | 2018-10-30 | 2019-03-01 | 中国电子科技集团公司第十三研究所 | Power device preparation method |
| CN112993503A (en) * | 2019-12-17 | 2021-06-18 | 伊兰泰克公司 | 5G universal passive intermodulation distortion coupling mode filter and filtering method |
| CN112993503B (en) * | 2019-12-17 | 2022-03-08 | 伊兰泰克公司 | 5G general coupling filter |
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