Switching circuit built in IC for earphone and loudspeaker...

Details Switching circuit built in IC for earphone and loudspeaker... Switching circuit built in IC for earphone and loudspeaker...

2005-08-09

2005-08-09

Pendleton, Brian Tyrone (Department: 2644)

Electrical audio signal processing systems and devices

Switching

C381S074000

Reexamination Certificate

active

06928176

ABSTRACT:
The present creation is to provide a switching circuit built in IC for earphone and loudspeaker of portable information device, and there is no any passive component outside the IC, thus making the circuit board assembly more easily, saving the area of the circuit board, decreasing the volume and the cost. It is very suitable in designing a compact portable information device. In order to avoid any possible logic error during the switching between earphone and loudspeaker, the present creation provides a special unsymmetrical design in differential MOS circuit, and provides a current mirror circuit.

REFERENCES:
patent: 4433209 (1984-02-01), Kurosawa et al.
patent: 5642424 (1997-06-01), Masaki
patent: 6397087 (2002-05-01), Kim et al.

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