Soft-start circuit and method for power-up of an amplifier...

Details Soft-start circuit and method for power-up of an amplifier... Soft-start circuit and method for power-up of an amplifier...

2005-09-19

2008-12-16

Nguyen, Matthew V (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S273000

Reexamination Certificate

active

07466115

ABSTRACT:
A method and circuit for providing a soft start-up process for an amplifier circuit to reduce or prevent destructive overshoot of an output voltage are provided. In accordance with an exemplary embodiment of the present invention, an exemplary method and circuit are configured to suitably momentarily replace an actual fixed reference voltage with a second reference voltage during the start-up process. Such a method and circuit can provide a fast start-up process without destructive overshoot and without affecting or compromising any control loop of the amplifier circuit, and can be configured within various applications. In accordance with an exemplary embodiment, an exemplary amplifier circuit is configured with a soft-start circuit, with the soft-start circuit configured to provide a secondary reference voltage during initial start-up before switching to an actual reference voltage. For example, an exemplary start-up circuit can be configured to generate a secondary reference voltage, and then though monitoring of a feedback voltage from an amplifier circuit, suitably switch in the secondary reference voltage and actual reference voltage to provide a controlled start-up process.

REFERENCES:
patent: 6046577 (2000-04-01), Rincon-Mora et al.
patent: 6310467 (2001-10-01), Sauer
patent: 6703813 (2004-03-01), Vladislav et al.
patent: 6703815 (2004-03-01), Biagi
patent: 7253596 (2007-08-01), Yamamoto et al.

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