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Some Characteristics of a Stable Negative Resistance

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2 Author(s)
Brunetti, Cledo ; Formerly, Assistant Professor of Electrical Engineering, Lehigh University, Bethlehem, Pa.; now, Radio Physicist, National Bureau of Standards, Washington, D.C. ; Greenough, L.

By employing positive feedback in a two-stage amplifier it is possible to obtain an input impedance which is equal to the impedance in the feedback circuit multiplied by a negative constant. For a resistance-capacitance feedback circuit the input impedance becomes a negative resistance in series with a negative capacitance. With the proper choice of circuit constants, the negative impedance can be made to approximate closely a pure negative resistance over any given frequency range. In the apparatus described, high stability is secured by the use of inverse feedback in addition to the positive-feedback loop.

Published in:

Proceedings of the IRE  (Volume:30 ,  Issue: 12 )