Solid State Amplifiers for 3.6 - 4.2 GHz Radio Relay

The design of microwave amplifiers by systems manufacturers is limited in gain, power output, and especially bandwidth by the parasitic reactances of the transistor packages used in the fabrication of discrete devices. These limitations become more critical as the frequency is increased, due to the proportionate change in reactance for a fixed value of inductance and capacitance. In order to avoid this parasitic degradation, the transistor manufacturer should supply transistors which have at least partial transformation networks incorporated within the package. This enables the systems house to then obtain the required bandwidth and performance with a minimum effort in both assembly techniques and circuit design.