Development of a High efficiency HF power amplifier

Author

Yamazoe, Masahiko ; Haeiwa, Kazuhisa ; Hirose, Shoji

Author_Institution

Eng. Adm. Dept., NHK

fYear

2008

fDate

14-16 Oct. 2008

Firstpage

1

Lastpage

5

Abstract

This paper describes development of a High efficiency HF power amplifier. We fabricated a new wideband power amplifier operating at short wave band (3 MHz-26 MHz) using class-E amplifier and obtained a high output power efficiency of 74% at 25.5 MHz that is a target performance by controlling the shunt capacity for wideband operation. In addition, the low loss characteristic of about 0.4 dB and under and wideband characteristics was obtained by employing the balun using the transformer with coaxial cables and output circuit combiner tuned including stray capacitance and inductance.

Keywords

HF amplifiers; baluns; power amplifiers; transformers; wideband amplifiers; HF power amplifier; balun; circuit combiner; class-E amplifier; coaxial cables; short wave band; transformer; wideband power amplifier; Broadband amplifiers; Coaxial cables; Hafnium; High power amplifiers; Impedance matching; Operational amplifiers; Power amplifiers; Power generation; Tuned circuits; Wideband; High-efficiency; Power amplifier; Short-wave; Transmitter; class-E;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2008. APCC 2008. 14th Asia-Pacific Conference on

Conference_Location

Tokyo

Print_ISBN

978-4-88552-232-1

Electronic_ISBN

978-4-88552-231-4

Type

conf

Filename

4773678