Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-07-02
1977-09-20
Rolinec, Rudolph V.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 17, 330 18, 330 19, 330 40, H03F 304
Patent
active
040500292
ABSTRACT:
Electronic apparatus is disclosed suitable for integrated circuit fabrication and comprising shunt voltage regulation. The electronic apparatus may be a radio receiver which uses an unregulated current source for its supply voltage. The power amplifier of the audio amplifier has a pair of conventional large area push-pull output transistors which are connected in shunt with the supply. In accordance with the invention, shunt voltage regulation of the supply voltage is achieved by sensing a change in the supply voltage using a zener diode for a voltage reference and then altering the idling current in the output transistors in response to changes in current flow through the zener diode. In consequence of increases in idling current, the output stages shift from class B toward class A operation and shunt regulate the supply voltage. The zener diode is arranged to provide both stabilization of the full supply voltage and the centering voltage of the push-pull output amplifier.
REFERENCES:
patent: 3870965 (1975-03-01), Frederiksen
patent: 3914703 (1975-10-01), Stauffer
patent: 3938053 (1976-02-01), Menniti et al.
Baker Carl W.
Dahl Lawrence J.
General Electric Company
Lang Richard V.
Neuhauser Frank R.
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