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Control of the Effective Internal Impedance of Amplifiers by Means of Feedback

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1 Author(s)
Mayer, H.F. ; General Engineering Laboratory, General Electric Company, Schenectady, N.Y.

The effective internal impedance of an amplifier may be either increased or reduced by the proper choice of one or a combination of several of the following types of feedback: 1. positive current, 2. negative current, 3. positive voltage, or 4. negative voltage. Impedance-reducing feedback has been applied to audio-frequency power amplifiers to flatten the response and improve the loud-speaker damping. Impedance-increasing feedback has been applied to intermediate-frequency amplifiers to increase selectivity without loss of stability.

Published in:

Proceedings of the IRE  (Volume:27 ,  Issue: 3 )