Impedance Mismatching in Wideband Transistor Amplifier Design

It is shown how simple, nonidentical transistor stages can be cascaded to give flat wideband responses and moderate gain while minimizing interstage interraction by purposely mismatching the impedance between stages. The interrelationship between gain and mismatch is discussed. Use of a grounded base amplifier with the conventional series feedback amplifier is considered. Experimental results are presented.