Closed-loop feedback amplification circuit based on waveform predistortion and working method thereof

A closed-loop feedback, amplifying circuit technology, used in amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve the problem of high output stability of linear power amplifiers, difficult to control phase accuracy, output Low stability and other problems, to achieve the effect of light weight, improved output efficiency, and low distortion

A closed-loop feedback, amplifying circuit technology, used in amplifiers with semiconductor devices/discharge tubes, amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve the problem of high output stability of linear power amplifiers, difficult to control phase accuracy, output Low stability and other problems, to achieve the effect of light weight, improved output efficiency, and low distortion

CN114400980APending Publication Date: 2022-04-26国网山东省电力公司营销服务中心(计量中心)
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  • Closed-loop feedback amplification circuit based on waveform predistortion and working method thereof
  • Closed-loop feedback amplification circuit based on waveform predistortion and working method thereof
  • Closed-loop feedback amplification circuit based on waveform predistortion and working method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the first aspect, the present invention provides a closed-loop feedback amplification circuit based on waveform predistortion, including:

[0041] The predistortion waveform fitter is connected to the signal input port and the output sampling circuit respectively;

[0042] The digital-to-analog converter receives the fitted digital waveform signal of the predistortion waveform fitting device;

[0043] The class D power amplifier receives the analog signal of the digital-to-analog converter and the closed-loop feedback signal of the closed-loop feedback circuit respectively;

[0044] The adaptive filter receives the amplified signal of the class D power amplifier.

[0045] specific,

[0046] figure 1 It is the overall system block diagram of the power amplifier. The power amplifier is mainly composed of a signal input port, a pre-distortion waveform fitter, a DA converter, a class D power amplifier, an output sampling circuit, a closed-loop feedback circuit, an ada...

Embodiment 2

[0077] In the second aspect, the present invention provides a closed-loop feedback amplification circuit working method based on waveform predistortion, including:

[0078] Realize the fast feedback channel of the power amplifier output through the closed-loop feedback circuit, and complete the power amplification output;

[0079] The output value of the power amplifier and the input signal value are sampled by the output sampling circuit, and the output value of the power amplifier is adjusted through the pre-distortion waveform fitting algorithm to realize high-precision adjustment of the output waveform of the power amplifier.

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Abstract

The invention discloses a closed-loop feedback amplification circuit based on waveform predistortion, and the circuit comprises a predistortion waveform fitting device which is connected with a signal input port and an output sampling circuit; the digital-to-analog converter is used for receiving the fitting digital waveform signal of the pre-distortion waveform fitting device; the D-type power amplifier is used for respectively receiving an analog signal of the digital-analog converter and a closed-loop feedback signal of the closed-loop feedback circuit; and the adaptive filter is used for receiving the amplified signal of the D-type power amplifier. The D-type power amplification circuit based on hardware closed-loop feedback of the waveform pre-distortion technology has the advantages of being high in output stability, small in distortion degree, high in output efficiency, high in output bandwidth, small in phase delay, small in size, light in weight, high in reliability and the like; appropriate filters are selected according to different output parameters, the output efficiency of the power amplifier is improved, and the method can be used for standard power sources in the field of electric power measurement.

Description

technical field [0001] The invention relates to the technical field of power amplifiers, in particular to a closed-loop feedback amplifier circuit based on waveform predistortion and its working method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, the current power amplifier solutions in the field of electric power measurement are mainly divided into two categories. One is the linear power amplifier solution using ready-made integrated power amplifiers and discrete components, and the other is the SPWM switching power amplifier solution using Mos tubes for switching chopping. Linear integration The power amplifier solution generally adopts the existing integrated power amplifier of ADI or TI, which is commonly used as a high-power audio power amplifier. The problem with the direct audio power amplifier is that the bandwidth ...

Claims

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Application Information

Patent Timeline
26 Apr 2022
Publication
CN114400980A
IPC
H03F1/32; H03F3/217; H03H21/00
CPC
H03F1/3241; H03F3/217; H03H21/0012
Inventors
李琮琮; 代燕杰