Conclusion
In his revisit of Mason's paper, Gupta states, "Perhaps the most convincing evidence of the utility of the concept of a unilateral power gain as a device figure of merit is the fact that for the last three decades, practically every new, active, two-port device developed for high frequency use has been carefully scrutinized for the achievable value of U..." This assumption is appropriate because "Umax" or "maximum unilateral gain" is still listed on transistor specification sheets, and Mason's Invariant is still taught in some undergraduate electrical engineering curricula—ones that Mason, no doubt, had a hand in innovating. Though now it has been over five decades, Mason's finding of an invariant device characteristic still plays a significant role in transistor design.
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