AES E-Library

AES E-Library

A Current-Feedback Audio Power Amplifier

Document Thumbnail

A new low cost, high performance audio power amplifier topology that uses current-feedback in the main gain stage is described. This technique, which has previously been restricted mainly to wideband and video amplifier circuit design, improves on the more common, voltage-feedback amplifier topology by providing a wide closed-loop bandwidth relatively independent of gain, and very high slew-rates. Measurements on the prototype power amplifier show that a closed-loop bandwidth of 1 MHz, at a gain of 24, and slew-rates in excess of 200 V/µs are readily achievable with inexpensive off-the-shelf components. In addition, the in-band harmonic distortion is quite low (<0.002% at 1kHz), due to the large loop gain that is achievable at audio frequencies.

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