The Feasibility of a Variable Output Matching Circuit in a High-Power SSPA

Document Type

Article

Publication Date

1-1-2002

Identifier/URL

40278246 (Pure); 84964344337 (QABO)

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/spl reg/) 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 /spl sim/110 W output, the variable matching circuit allows for /spl sim/50% PAE down to about 20 W output, compared to about 25% PAE from a fixed matching circuit.

DOI

10.1109/RAWCON.2002.1030149

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