The so-called “switching” amplifiers like Class-D, E, F and inverse F are briefly reviewed in this article.

These amplifiers are based on the notion of limiting the dissipation in the active device during its resistive “turn-on” and turn-off” times and in doing so, improving the efficiency over that of the classical “linear” amplifier classes. Again, computer simulation of the basic circuit topologies is used give the reader an intuitive feel for how these amplifiers work.

This article was originally published as the featured article in the June 2011 issue of the RF Globalnet Newsletter.