Patent ID: 6954537
Filing Date: 2005-10-11
Classification: H03F,H03G

Abstract:
1. An audio amplifier device comprising: a power supply including an output for providing a supply voltage; a voltage divider connected to the output of said power supply for providing a divided supply voltage; an audio amplifier comprising a supply voltage rejection circuit and including a first input for receiving an input audio signal, a second input for receiving the supply voltage, a third input for receiving a supply voltage rejection signal for said supply voltage rejection circuit, and an output for providing an output audio signal; and a speaker connected to the output of said audio amplifier; and a power-off noise suppression circuit having a first input for receiving the divided supply voltage and an output for providing the supply voltage rejection signal, said power-off noise suppression circuit setting the supply voltage rejection signal equal to the divided supply voltage during power-off of said power supply so that a rate of decrease of the supply voltage is greater than a rate of decrease of the supply voltage rejection signal.