Optimum Design of the Shunt-Series Feedback Pair with a Maximally Flat Magnitude Response

In this paper, analysis and design of the shunt-series pair feedback amplifier are given. The design achieves optimum gain-bandwidth product with a maximally flat magnitude transmission for a specified gain or desensitivity. Phantom zero is used to avoid degradation of feedback bandwidth and to obtain a filter type transient response. Experimental verification of the theory is given with a medium frequency alloyed-junction transistors and HF mesa transistors. The agreement between the theoretical and experimental work is shown to be good in all cases, both in time and in frequency domains.