Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-07-17
2010-10-19
Shingleton, Michael B (Department: 2815)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C330S20700P, C375S238000, C381S120000, C381S121000
Reexamination Certificate
active
07816980
ABSTRACT:
An audio power amplifier provides a virtual ground to reduce power on/off noise and a method for processing a signal in the audio power amplifier. The audio power amplifier includes a switching amplifier to amplify a small output pulse width modulation (PWM) signal so as to generate a large output PWM signal, a pulse generating unit to generate a pulse signal having the same level as that of the PWM signal level, a first low pass filter to allow the large output PWM signal amplified by the switching amplifier to be low-pass filtered so as to restore the PWM signal to an audio signal, and a second low pass filter to allow the pulse signal generated by the pulse signal generating unit to be low-pass filtered so as to convert the pulse signal into a virtual ground voltage with respect to the restored audio signal.
REFERENCES:
patent: 6166596 (2000-12-01), Higashiyama et al.
patent: 6300826 (2001-10-01), Mathe et al.
patent: 7239200 (2007-07-01), Ishii et al.
patent: 1 630 965 (2006-03-01), None
patent: WO 2006/059956 (2006-06-01), None
European Search Report issued Aug. 14, 2008 (EP 07119193.6).
Samsung Electronics Co,. Ltd
Shingleton Michael B
Stanzione & Kim LLP
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