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.
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can
subscribe to this RSS feed.
Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.
