Frequency stable digitally controlled driver circuit

Details Frequency stable digitally controlled driver circuit Frequency stable digitally controlled driver circuit

1989-03-06

1990-07-24

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330277, H03F 326, H03F 316

Patent

active

049437844

ABSTRACT:
A stable digitally controlled driver circuit having an output stage with two series-coupled transistors of opposite conductivity type. The driver circuit operates as an analog amplifier with a digitally controlled output stage. The digital control is provided by control transistors which selectively alternately couple a gate of each transistor in the output stage to the output of a differential amplifier. An output signal of the driver circuit is fed back to the input of the differential amplifier to provide a voltage gain determined by the feedback configuration. When both of the series-coupled transistors in the output stage are made nonconductive, the driver circuit's output is in a high impedance state thereby providing a three-state output.

REFERENCES:
patent: 3947727 (1976-03-01), Stewart

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