A simple interstage matching technique for designing hybrid microwave power amplifiers

A non-50-(Omega) interstage matching technique has been used for designing multistage microwave power amplifiers. The technique is especially relevant to cases where the final stage uses an LDMOS device whose dynamic input impedance is extremely low and is best matched directly (without first translating to 50 (Omega)) to the output of the previous stage. A specific example is presented. The concept, however, is quite general and will be of interest to the RF design community at large.