Improving amplifier stability through resistive loading below the operating frequency

Author

Kim, Sun-Wook ; Chang, Ik-soo ; Kang, Won-tae ; Kyung, In-Pyo

Author_Institution

Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea

Volume

47

Issue

3

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

359

Lastpage

362

Abstract

A new design method for a stable RF amplifier using a broadband-matched 3-dB coupled line is proposed in this paper. The proposed broad-band matching circuit consists of lossless matching circuits at operating frequency band and resistive matching circuits at frequencies below the operating band. This design method improves the stability of the amplifier and is suitable for the design of a power amplifier and multistage amplifier. When applying this proposed method to a design of a two-stage power amplifier for personal communication systems, measured results show 18.0dB gain and 9 W (39.5 dBm) output power

Keywords

UHF power amplifiers; circuit stability; impedance matching; mobile radio; radiofrequency amplifiers; 0 to 1840 MHz; 18 dB; 9 W; amplifier stability; broadband matching circuit; design method; lossless matching circuits; multistage amplifier; operating frequency; personal communication systems; power amplifier; resistive loading; resistive matching circuits; stable RF amplifier; Broadband amplifiers; Circuit stability; Coupling circuits; Design methodology; Frequency; Gain measurement; Power amplifiers; Power generation; Power measurement; Radiofrequency amplifiers;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.750241

Filename

750241