Design of a RF power amplifier using distributed network syntheses

분포정수 회로합성을 이용한 RF 전력 증폭기 설계

  • 김남태 (인제대학교 전자정보통신공학부) ;
  • 이민수 (대진대학교 통신공학과)
  • Published : 2006.08.01

Abstract

In this paper, the distributed network synthesis, which is useful to the design of wireless power amplifiers, is proposed, and a RF power amplifier is designed using the technique. The transfer function of distributed matching circuits is derived by Chebyshev approximation, and network element values for a specified topology are given as a function of minimum insertion losses and ripples. As an example, after a power transistor is modeled by load-pull data, the synthesis for distributed matching networks is applied to a power amplifier design, which has the electrical performance of 17dB gain and less IM3 than -43dBc at the 20W output power between 800 to 900MHz frequency range. Experimental results from a fabricated amplifier are shown to approach the design performance in the operating frequency range. The design of impedance matching networks by the transfer function synthesis is a useful method for the design of RF power amplifiers.

Keywords

Power amplifier;Impedance matching network;Network Synthesis