AES Store

Journal Forum

Reflecting on Reflections - June 2014
1 comment

Quiet Thoughts on a Deafening Problem - May 2014
1 comment

Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
5 comments

Access Journal Forum

AES E-Library

Distortion Correction in Audio Power Amplifiers

An audio power amplifier design technique is presented which has the property of minimizing the nonlinear distortion that is generated in class A and class AB output stages. A modified feedback technique has been identified that is particularly suited to the design of near-unity gain stages. The technique can linearize the transfer characteristic and minimize the output resistance of the output stage. Consequently it is possible to design a power amplifier that uses fairly modest overall negative feedback, yet attains minimal crossover distortion together with an adequate damping factor. A generalized feedforward-feedback structure is presented from which a system model is derived that can compensate for both nonlinear voltage and nonlinear current transfer characteristics. From this theoretical model, several circuit examples are presented which illustrate that only circuits of modest complexity are needed to implement the distortion correction technique. In conclusion a design philosophy is described for an audio powr amplifier which is appropriate for both bipolar and FET devices, whereby only modest overall negative feedback is necessary.

Author:
Affiliation:
JAES Volume 29 Issue 1/2 pp. 27-30; February 1981
Publication Date:

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!


 
Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society