Apparatus and method for asymmetric charge pump for an audio...

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry

Reexamination Certificate

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Reexamination Certificate

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07554408

ABSTRACT:
An audio amplifier with an integrated asymmetric charge pump is provided. The audio amplifier receives VDD and VSS as power supply signals. The integrated charge pump is arranged to provide VSS from VDD, such that VSS is a negative voltage that is lower in magnitude than VDD.

REFERENCES:
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patent: 6922097 (2005-07-01), Chan et al.
patent: 2003/0138112 (2003-07-01), Doy
patent: 2005/0024962 (2005-02-01), Chan et al.
patent: 2007/0159557 (2007-07-01), Nakakita et al.
MAX1673, MAXIM: Regulated, 125mA-Output Charge-Pump DC-DC Inverter, Maxim Integrated Products, USA, Jan. 1998, 8 pgs.
LM4911, “Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output,” National Semiconductor Corporation, Feb. 2003, 22 pgs.
LM4920, “Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier,” National Semiconductor Corporation, Oct. 2006, 17 pgs.
LM4922. “Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier,” National Semiconductor Corporation, Oct. 2006, 21 pgs.
LM4926, “Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier,” National Semiconductor Corporation, Jun. 2005, 22 pgs.

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