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Comparison of Voltage- and Current-Feedback Amplifiers

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1 Author(s)
Schulz, E.H. ; Illinois Institute of Technology, Chicago, Illinois

This paper points out the differences between an amplifier with voltage feedback and one with current feedback. The effect of variations of amplifier constants on output voltage and current is decreased by either type of negative feedback. Voltage feedback decreases the effect of load impedance on output voltage, and current feedback decreases the effect of load impedance on load current. Voltage feedback increases the damping of a loudspeaker and improves its response. A table also is given to assist in the choice of type and amount of feedback to be used in a given application.

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Proceedings of the IRE  (Volume:31 ,  Issue: 1 )