AES E-Library

AES E-Library

Digital PWM Amplifier Using Nonlinear Feedback and Predistortion

Document Thumbnail

A nonlinear feedback topology is used to reduce the deviations of a practical PWM output stage from ideal theoretical behaviour, the theoretical nonlinearity of the PWM process being corrected using predistortion. As the final output is analogue, an ADC is needed if the feedback is to be digital, and several problems arise from the practical limitations of commercially-available ADCs, including delay and addition of ultrasonic noise. We show how these problems can be minimised, and illustrate the performance of a digital PWM amplifier in which feedback results in a significant reduction of distortion throughout the audio range.

AES Convention: Paper Number:
Publication Date:

Click to purchase paper as a non-member 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 $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!

AES - Audio Engineering Society