Driver circuit with gradual voltage ramp up and ramp down

Details Driver circuit with gradual voltage ramp up and ramp down Driver circuit with gradual voltage ramp up and ramp down

2006-12-26

2006-12-26

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S131000

Reexamination Certificate

active

07154308

ABSTRACT:
A driver circuit is disclosed comprising an amplifier, a data DAC, and a voltage control mechanism (VCM). During a power up sequence, the VCM provides gradually increasing voltage signals to the amplifier to cause a voltage at the output of the amplifier to increase gradually. During a power down sequence, the VCM provides gradually decreasing voltage signals to the amplifier to causes the voltage at the output of the amplifier to decrease gradually. By gradually increasing and decreasing the voltage at the output of the amplifier in this way, pop noise caused by a rapid change in voltage can be reduced or even eliminated.

REFERENCES:
patent: 6066976 (2000-05-01), Cho
patent: 6194941 (2001-02-01), Zarabadi et al.
patent: 6600365 (2003-07-01), Frith
patent: 6788156 (2004-09-01), Tam et al.
patent: 6876697 (2005-04-01), Peters et al.
patent: 6961385 (2005-11-01), Plisch et al.
patent: 2005/0025322 (2005-02-01), Henson et al.
patent: 2005/0135502 (2005-06-01), Zhang et al.
U.S. Appl. No. 10/862,917, filed Jun. 7, 2004.

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