Feedback shift (FBS) type compensating network and application in audio power amplifier thereof

A power amplifier, compensation network technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve problems such as sound quality degradation, and achieve the effect of improving efficiency

Inactive Publication Date: 2010-06-09
王震武 +2
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This Feedback Shift (FBS) compensation technology includes the final power transistor in a local negative feedback loop that is usually formed by a Miller capacitor in the mid-high frequency band of the audio, so that the Various performance indicators including crossover distortion have been greatly improved, thus fundamentally solving the problem of sound quality deterioration in the middle and high frequency bands of Class A and B transistor amplifiers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Feedback shift (FBS) type compensating network and application in audio power amplifier thereof
  • Feedback shift (FBS) type compensating network and application in audio power amplifier thereof
  • Feedback shift (FBS) type compensating network and application in audio power amplifier thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It must be pointed out that the T-shaped network proposed by the present invention can be composed of various circuits, and is not limited to the solutions disclosed in the embodiments here. Any compensation network designed based on the idea of ​​the present invention to realize the feedback shift function should be regarded as a specific embodiment of the present invention.

[0041] Figure 5 The first specific embodiment shown is a type 1 feedback shift (FBS) compensation network, which is composed of capacitors Cf1, Cf2 and resistor Rd. The capacitor Cf1 is connected between the X terminal and the center point CT, and its capacitance is equivalent to or slightly larger than the value of the traditional Miller capacitor, generally 10PF-100PF; the capacitor Cf2 is connected between the Z terminal and the center point CT, and its The capacitan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a feedback shift (FBS) type compensating network which can be used in the audio power amplifier and any negative feedback amplifying circuit with emitter or source follower output stage and can replace the traditional miller capacitance to provide phase-lag compensation. As the feedback network forms a local negative feedback with current-voltage amplifying stage and output stage in the frequency range above dominant pole, the degradation of circuit performance in the middle and high frequency range generally caused by the decrease of big ring negative feedback is made up to a certain extent so that the breakthrough increase of the indexes related to the output stage such as crossover distortion in middle and high frequency range is realized, the dependency of the circuit on the bias current of the power tube is greatly reduced, and a class AB amplifier which only uses tens of milliamps bias current can realize the crossover distortion level of the class A power amplifier or even less. The invention is a structural improvement for the traditional negative feedback amplifying circuit, the method is easy and the compensating network can be used in most of power amplifiers and other negative feedback amplifying circuits.

Description

technical field [0001] The invention relates to a feedback shift type (FBS) compensation network, which is suitable for a negative feedback amplifier using an emitter or a source follower in the final stage of an audio power amplifier, and belongs to the technical field of electronic circuits and audio. Background technique [0002] Traditional audio power amplifiers and integrated operational amplifiers using large-loop negative feedback linear amplifiers all adopt a classic three-stage circuit structure, such as figure 1 shown. The circuit consists of the first stage of amplification, which is the voltage-current input stage, the second stage of amplification, namely the current-voltage amplification stage, the third stage of amplification, namely the emitter stage or source follower output stage, a large-loop negative feedback network and for The hysteresis compensation capacitor (generally called Miller compensation capacitor or Miller capacitor) used to make the circui...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
Inventor 王震武安东金慧星
Owner 王震武
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products