Controllable gain signal amplifier

Details Controllable gain signal amplifier Controllable gain signal amplifier

1975-08-25

1976-12-21

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 30D, H03G 330

Patent

active

039991415

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, a first series resistor coupled between the resistive divider and the input of the voltage follower and a second resistor coupled between the output of the follower 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: 3750042 (1973-07-01), Peil et al.
patent: 3757240 (1973-09-01), Fogg
patent: 3772463 (1973-11-01), Wakai et al.
patent: 3803505 (1974-04-01), Ishigaki et al.
patent: 3875522 (1975-04-01), Hoefi
patent: 3887938 (1975-06-01), Gelchin

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