Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2009-05-27
2011-12-06
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S297000
Reexamination Certificate
active
08072266
ABSTRACT:
An apparatus and method are provided for a Class G amplifier that includes an output stage, where an output stage supply voltage is selected based upon an input signal voltage of the output stage. The amplifier may also include an input stage coupled to the output stage, where the input stage generates the input signal voltage for the output stage. The output stage may include first and second MOS devices operating as a Class AB amplifier, and the output stage supply voltage selected based upon gate voltages of the MOS devices. The supply voltages may be generated by a buck converter, and a charge pump that is coupled to the buck converter.
REFERENCES:
patent: 7242250 (2007-07-01), Tsurumi
patent: 7482869 (2009-01-01), Wilson
patent: 7750732 (2010-07-01), Delano et al.
patent: 7782141 (2010-08-01), Witmer et al.
patent: 7808324 (2010-10-01), Woodford et al.
patent: 7830209 (2010-11-01), Woodford et al.
“Class-G Directpath Stereo Headphone Amplifier with I2C Volume Control”, Texas Instruments, Mar. 2009, 30 pages.
“Boomer Audio Power Amplifier Series”, National Semiconductor, Mar. 24, 2009, 28 pages.
Bhatt Ansuya
Hoomes Benjamin
National Semiconductor Corporation
Nguyen Patricia
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