Optimum design of small-signal microwave amplifiers with specified stability safety margin
When employing conditionally stable transistors in microwave amplifier design, it is impossible to have both ports perfectly matched. One can easily design for a perfect match at one of the ports, but the resulting mismatch at the remaining port may be unacceptable. Through trial and error using graphical methods, the designer may trade-off the perfect port match for improved match at the other port. In this paper, we propose a systematic approach whereby the maximisation of an objective function results in maximum gain and port match, for given stability safety margins.