ANALYSIS OF DISTRIBUTED AMPLIFIER STRUCTURERS.

The research includes an analysis of the stability requirements and an evaluation of feasible configurations for linear solid-state distributed amplifiers. In particular, the structures considered may have one or more negative parameters. The models investigated are divided into reciprocal and non-reciprocal types. Sufficient conditions for stable amplification are derived from a network model. The results show that for passive terminations, the characteristic impedance of a reciprocal transmission line must not have a negative real part for right half-plane frequencies. For amplification with distance down the line, the real part of the propagation constant must be negative. A line length is determined from the magnitude of the loop gain expression such that reflections at the terminations will not saturate the structure. For optimum gain, the line and load must be matched. Parameter tolerances are shown to complicate the matching of this reciprocal model and the load. Author