The feasibility of a variable output matching circuit in a high-power SSPA

Author

Cotler, A.C. ; Brown, E.R.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

fYear

2002

fDate

2002

Firstpage

189

Lastpage

191

Abstract

This paper analyzes a new technique for matching the output impedance of a 100-W-class solid-state power amplifier (SSPA) to a load using a variable transformer circuit consisting of switchable series-inductor and shunt-capacitor banks. A large-signal time-domain tool (Saber®) is adapted to model the matching circuit and shows that the power-added efficiency can be made much more level with respect to input and output power than in a fixed matching circuit. For example, in a class-AB LD-MOSFET-based SSPA designed for 60% PAE at ∼110 W output, the variable matching circuit allows for ∼50% PAE down to about 20 W output, compared to about 25% PAE from a fixed matching circuit.

Keywords

MOS integrated circuits; UHF power amplifiers; capacitor switching; cellular radio; high-frequency transformers; impedance matching; power transformers; time-domain analysis; 100 W; LD-MOSFET-based SSPA; Saber; cellular base stations; class-AB SSPA; high-power SSPA; large-signal time-domain tool; output impedance matching; power-added efficiency; shunt-capacitor banks; solid-state power amplifier; switchable series-inductor; variable output matching circuit; variable transformer circuit; Circuit simulation; Impedance matching; Power amplifiers; Power generation; Power semiconductor switches; Radio frequency; Radiofrequency amplifiers; Solid state circuits; Switching circuits; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Conference, 2002. RAWCON 2002. IEEE

Print_ISBN

0-7803-7458-4

Type

conf

DOI

10.1109/RAWCON.2002.1030149

Filename

1030149