Class C-E high-efficiency tuned power amplifier

Author

Kazimierczuk, Marian K. ; Tabisz, Wojciech A.

Author_Institution

Dept. of Electr. Syst. Eng., Wright State Univ., Dayton, OH, USA

Volume

36

Issue

3

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

421

Lastpage

428

Abstract

A numerical analysis of a Class C-E tuned power amplifier is presented, along with a design procedure and experimental results. The efficiency and the maximum operating frequency of the amplifier are intermediate between those of the Class C and E amplifiers. The collector efficiency of the Class C amplifier is about 70%, whereas that of the Class E amplifier is about 96%. The maximum operating frequency of the optimum-efficiency Class E amplifier is, however, limited by the transistor output capacitance. The operating frequency of the Class C amplifier can be at least 16 times higher than that of the optimum-efficiency Class E amplifier at the same output power, DC supply voltage, and transistor output capacitance. The Class C, E, and C-E amplifiers can be obtained with the same circuit topology. The class of operation depends on the values of the load-network components. The tradeoff between the efficiency and the maximum operating frequency is evaluated for all three classes, using nonlinear time-domain simulation. The experimental and theoretical results are in good agreement.<>

Keywords

network parameters; power amplifiers; tuning; Class C-E; DC supply voltage; circuit topology; collector efficiency; efficiency; load-network components; maximum operating frequency; nonlinear time-domain simulation; transistor output capacitance; tuned power amplifier; Capacitance; Circuit topology; Frequency; High power amplifiers; Numerical analysis; Power amplifiers; Power generation; Power supplies; Time domain analysis; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.17589

Filename

17589