Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2007-05-21
2009-06-30
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
Reexamination Certificate
active
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:
patent: 6636104 (2003-10-01), Henry
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.
Bhatt Ansuya P.
Chen Huaijin
Chen Marcellus
Singh Raminder Jit
Darby & Darby PC
Gaffney Matthew M.
Mottola Steven J
National Semiconductor Corporation
LandOfFree
Apparatus and method for asymmetric charge pump for an audio... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for asymmetric charge pump for an audio..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for asymmetric charge pump for an audio... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4059904