The design of high-power switched transistor amplifiers

Factors affecting the design of switched transistor power amplifiers are discussed. Semiconductor devices now available for such applications are listed, and various means for producing variable mark/space ratio driving pulses are mentioned. Details are given of two transistor power amplifiers; these have maximum outputs of 2 watts and 1 kW, approximately. Their efficiencies are 92 and 99%, respectively. Finally, some applications of switched transistors in servo systems and a.f. amplifiers are mentioned.