Constant quiescent current, class AB amplifier output stage

Details Constant quiescent current, class AB amplifier output stage Constant quiescent current, class AB amplifier output stage

1982-12-13

1984-07-03

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330265, 330296, H03F 330

Patent

active

044582137

ABSTRACT:
A circuit maintains the quiescent collector current of an output transistor amplifier constant by sensing the voltage developed across a resistor connected in series with the output transistor's collector and, using a differential amplifier, produces a first signal representative thereof which is sampled and held by a circuit controlled by a zero voltage crossing detector sensitive to the amplifier output voltage. The sampled and held signal is inverted and integrated with respect to an adjustable reference voltage to produce a second signal. The second signal controls the current passed by a transistor connected in a voltage divider network supplying the base bias voltage to the output transistor.

REFERENCES:
patent: 4306109 (1981-12-01), Kondov

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