Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1995-01-31
1997-06-24
Mottola, Steven
Amplifiers
Hum or noise or distortion bucking introduced into signal...
381 94, H03F 126
Patent
active
056420765
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: 4638507 (1987-01-01), Palara et al.
Hirayama Hiroshi
Naokawa Toyojiro
Kwok Edward C.
Mottola Steven
National Semiconductor Corporation
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