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Design Theory of Optimum Negative-Resistance Amplifiers

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2 Author(s)
Kuh, E.S. ; Dept. of Elec. Engrg., University of California, Berkeley, Calif. ; Patterson, J.D.

In this paper we consider general amplifiers obtained by imbedding a linear active 1-port device in arbitrary 3-ports. The active device is assumed to have a representation of a negative conductance -GD in parallel with a parasitic capacitance CD. We prove that for the lossless reciprocal imbedding, the transducer voltage gain is limited by ¿ S21¿ < ¿(1+e¿GD/¿0CD), where ¿0 is the angular bandwidth. For arbitrary passive imbedding, ¿S21¿ ¿ e¿GD/¿0CD. Synthesis methods to approach or achieve the optimum are presented. Other types of amplifier configurations are next considered. In each case, the optimum gain-bandwidth formula, synthesis procedure and some useful design curves are given.

Published in:

Proceedings of the IRE  (Volume:49 ,  Issue: 6 )