No turn-on pop noise amplifier

Details No turn-on pop noise amplifier No turn-on pop noise amplifier

1995-01-31

1996-07-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

381121, 330255, H03F 326

Patent

active

055370810

ABSTRACT:
An audio amplifier with no turn-on pop noise is achieved by the following features: (i) an input stage which operates under zero common-mode input voltage, (ii) an output stage which provides the low voltage end of its voltage swing very close to ground voltage, and (iii) a system of shunt circuits for discharging external capacitors, so as to prevent, upon subsequent power-up, pop noises due to residue charges in the external capacitors. In one embodiment, two peripheral collector transistors are provided to implement a window comparator for discharging the input terminals, the bias voltage and the output terminal of the audio amplifier.

REFERENCES:
patent: 4370623 (1983-01-01), Nagasawa
patent: 5070308 (1991-12-01), Padi
patent: 5361041 (1994-11-01), Lish

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