Apparatus and method for a driver with an adaptive drive...

Details Apparatus and method for a driver with an adaptive drive... Apparatus and method for a driver with an adaptive drive...

2007-06-05

2007-06-05

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C326S082000, C326S083000, C326S091000, C327S080000, C327S081000

Reexamination Certificate

active

11043797

ABSTRACT:
A circuit for adaptively adjusting the drive strength of output power transistors in a class D amplifier is provided. The circuit includes a driver circuit and a low-voltage detect circuit. The low-voltage detect circuit is arranged to assert a low-voltage detect signal if a low supply voltage condition is detected. The driver circuit is arranged to increase the drive strength if the low-voltage detect signal is asserted. The driver circuit includes a first driver and a second driver. The second driver is enabled if the low-voltage detect signal is asserted, and disabled if the low-voltage detect signal is unasserted.

REFERENCES:
patent: 5424721 (1995-06-01), Asai
patent: 5689202 (1997-11-01), Ranson
patent: 5742148 (1998-04-01), Sudo et al.
patent: 5894423 (1999-04-01), Ling et al.
patent: 5961542 (1999-10-01), Agarwala
patent: 6633186 (2003-10-01), Bazes
patent: 6917226 (2005-07-01), Brown

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