Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-09-05
2009-02-17
Choe, Henry K (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000
Reexamination Certificate
active
07492220
ABSTRACT:
A controller of a power amplifier includes an oversampler for oversampling an incoming digital signal to generate an oversampled signal, a controlling module for generating a first control signal and a second control signal according to the oversampled signal, a PWM circuit for generating a first PWM signal according to the first control signal, and a pulse width adjuster for adjusting a pulse width of the first PWM signal according to the second control signal to generate a second PWM signal for controlling a power stage of the power amplifier.
REFERENCES:
patent: 7209002 (2007-04-01), Ohkuri et al.
patent: 7292171 (2007-11-01), Heeb
patent: 7391346 (2008-06-01), Determan et al.
Chiu Shu-Yeh
Wu Po-Chiang
Choe Henry K
Hsu Winston
Realtek Semiconductor Corp.
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