Half-voltage headphone driver circuit

Details Half-voltage headphone driver circuit Half-voltage headphone driver circuit

2011-08-02

2011-08-02

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

With amplifier

C381S074000, C330S250000

Reexamination Certificate

active

07991172

ABSTRACT:
The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and −VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.

REFERENCES:
patent: 5237209 (1993-08-01), Brewer
patent: 5306954 (1994-04-01), Chan et al.
patent: 6411531 (2002-06-01), Nork et al.
patent: 6922097 (2005-07-01), Chan et al.
patent: 2003/0179892 (2003-09-01), Madsen
patent: 2005/0110574 (2005-05-01), Richard et al.
Maxim, Dubler/Inverter Carge Pumps Divide by Two, Application Note 1876, Feb. 3, 2003.
Maxim, MAX1730, “50mA Regulated Step-Down Charge Pump for 1.8 or 1.9 Logic”, Feb. 28, 2000.

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