Driving amplifier circuit with digital control

Details Driving amplifier circuit with digital control Driving amplifier circuit with digital control

2008-06-02

2009-12-08

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S267000

Reexamination Certificate

active

07629849

ABSTRACT:
A driving amplifier circuit includes: a first driver for souring a load current to a load; a second driver for sinking the load current from the load; a first operational amplifier (op-amp) coupled to a differential input signal for driving the first driver; a second operational amplifier coupled to the differential input signal for driving the second driver; a first bias circuit for biasing the first driver; a second bias circuit for biasing the second driver; an enabling circuit, coupled to the first bias circuit and the second bias circuit, for enabling either the first bias circuit or the second bias circuit according to a control signal; and a digital control circuit, coupled to the enabling circuit, for monitoring currents of the first driver and the second driver to generate the control signal.

REFERENCES:
patent: 4607233 (1986-08-01), Van Tuijl
patent: 5754078 (1998-05-01), Tamagawa
patent: 6369653 (2002-04-01), Kappes
patent: 6903610 (2005-06-01), Aoki et al.
“A CMOS Large-Swing Low-Distortion Three-Stage Class AB Power Amplifier” IEEE Journal of Solid State Circuits, vol. 25, No. 1, pp. 265-273, Feb. 1990.

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