Title :
High-efficiency harmonic-control amplifier
Author :
Ingruber, Bernhard ; Pritzl, Werner ; Smely, Dieter ; Wachutka, Martin ; Magerl, Gottfried
Author_Institution :
Dept. of Commun. & Radio Frequency Eng., Vienna Univ. of Technol., Austria
fDate :
6/1/1998 12:00:00 AM
Abstract :
A half-sinusoidally driven class-A harmonic-control amplifier (hHCA) combines the advantage of high gain of class A with the advantage of high drain efficiency of class F. Consequently, power-added efficiency is increased as compared with state-of-the-art high-efficiency amplification techniques. As this innovative amplifier concept consists of a pulse-forming class-B amplifier stage followed by a class-A power-amplifier stage, intermodulation distortion is low even in saturation. The realization of such a two-stage hHCA offers 71% overall efficiency, 27.9 dBm output power, and 22.4 dB gain at 1.62 GHz. Two-tone measurements at 1 dB gain compression, where the amplifier´s single-carrier (SC) overall efficiency is still 64%, has demonstrated thirdand fifth-order intermodulation distortion of -29 and -21 dBc, respectively
Keywords :
UHF integrated circuits; UHF power amplifiers; harmonics; hybrid integrated circuits; intermodulation distortion; 1.62 GHz; 22.4 dB; 64 to 71 percent; class F; class-A power-amplifier stage; fifth-order IMD; harmonic-control amplifier; high-efficiency amplifier; intermodulation distortion; pulse-forming class-B amplifier stage; third-order IMD; High power amplifiers; Intermodulation distortion; Microwave amplifiers; Microwave devices; Operational amplifiers; Power amplifiers; Power generation; Power system harmonics; Pulse amplifiers; Voltage;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
