RF Small Signal Design Using Two-Port Parameters

Design of the solid-state, small-signal RF amplifier using two-port parameters is a systematic, mathematical procedure, with an exact solution (free from approximation) available for the complete design problem. The only sources of error in the final design are parameter variations resulting from transistor parameter distributions and strays in the physical circuit. Parameter distributions result from limits in measurement and random variations among identically designed transistors.

The purpose of this paper is to provide, in a single working reference, the important relationships necessary for the complete solution of the RF small-signal design problem using two-port parameters. The major portion of the report presents design equations in terms of admittance parameters. A section on design with scattering parameters is also included. This paper is based on work by Linvill, Stern, and others. Those who may wish to consider the derivations of some of the expressions sho