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

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

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...

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Veröffentlicht in:Proceedings of the IRE 1939-03, Vol.27 (3), p.213-217
1. Verfasser: Mayer, H.F.
Format: Artikel
Sprache:eng
Schlagworte:
Associate members
Damping
Electric resistance
Equations
Frequency
Impedance
Negative feedback
Power amplifiers
Stability
Voltage
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Beschreibung
Zusammenfassung: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.
ISSN:0096-8390
2162-6634
DOI:10.1109/JRPROC.1939.228140