Controller gain signal amplifier

Details Controller gain signal amplifier Controller gain signal amplifier

1974-12-06

1976-07-20

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 30D, 358 27, H03G 330

Patent

active

039709485

ABSTRACT:
A signal amplifier is supplied with input signals at its base electrode and also is supplied at its emitter with quiescent operating current from a current source. Amplified output signals developed at the collector of the amplifier are coupled to a transistor-diode current splitter. The relative division of current in the splitter is controlled by coupling a variable direct current supply to the diode. The latter supply comprises a source of direct voltage, a variable, resistive voltage divider coupled across the voltage source, and the combination of a voltage follower stage and a series resistor coupled between the resistive divider and the diode. Gain controlled push-pull output signals may be provided by differentially coupling a second amplifier device to the first and coupling the output of a second current splitter to the second amplifier. The second current splitter is then also controlled by the same current source as the first.

REFERENCES:
patent: 3740462 (1973-06-01), Harwood
patent: 3772463 (1973-11-01), Wakai et al.

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