Circuit and semiconductor device for reducing the generation...

Details Circuit and semiconductor device for reducing the generation... Circuit and semiconductor device for reducing the generation...

2005-11-22

2005-11-22

Mai, Lam T. (Department: 2819)

Amplifiers

Combined with automatic amplifier disabling switch means

C330S104000, C330S112000, C330S250000

Reexamination Certificate

active

06967530

ABSTRACT:
A circuit for a power amplifier is disclosed which amplifies and outputs an audio signal by amplifying an input audio signal using first and second differential circuits, and driving a push-pull output transistor with the outputs from the first and second differential circuits. The circuit includes a signal generating part generating a disconnection timing signal for disconnecting a bias current reducing activation currents of the first and second differential circuits based on a switch control signal, and positive feedback loops of the first and second differential circuits. A switch part is disposed in each of the positive feedback loops of the first and second differential circuits, disconnecting the positive feedback loops in response to the disconnection timing signal. A bias part stops the operation of the first and second differential circuits by reducing the activation currents of the first and second differential circuits by reduction of the bias currents.

REFERENCES:
patent: 4383223 (1983-05-01), Ulmer
patent: 4471321 (1984-09-01), Bowers
patent: 4516082 (1985-05-01), Smith et al.
patent: 4730168 (1988-03-01), Senderowicz et al.
patent: 4881045 (1989-11-01), Dillman
patent: 5471171 (1995-11-01), Itakura et al.
patent: 5656947 (1997-08-01), Opris
patent: 6304109 (2001-10-01), Brokaw

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