Driver circuit having reduced cross-over distortion

Details Driver circuit having reduced cross-over distortion Driver circuit having reduced cross-over distortion

1980-12-16

1982-06-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330264, 330268, 330300, H03F 330, H03F 345

Patent

active

043365035

ABSTRACT:
A driver circuit suitable for use in an operational amplifier, includes a bipolar pull-up transistor which sources current to an output terminal in proportion to an applied drive current, and an MOS pull-down transistor which sinks current from the output terminal in proportion to an applied control voltage. An MOS drive transistor provides a constant drive current for the pull-up transistor, and an MOS shunt transistor shunts the drive current away from the bipolar transistor in proportion to the control voltage. A cross-over compensation circuit develops a predetermined bias voltage on the base of the bipolar transistor relative to the voltage on the output terminal, to assure a minimum level of operation of the bipolar transistor when the output terminal is near the analog ground voltage.

REFERENCES:
patent: 4068187 (1978-01-01), Amada et al.
Haque et al., "A Two Chip PCM Voice CODEC with Filters", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 961-969.

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