Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2011-06-21
2011-06-21
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C330S20700P
Reexamination Certificate
active
07965137
ABSTRACT:
A class-D power amplifier according to the present invention includes: a pulse width modulation circuit which modulates an analog signal into low-level and high-level binary signals; and a detection circuit which turns off operation of a circuit connected with a back stage of the pulse modulation circuit if the high level or the low level of the binary signal output from the pulse width modulation circuit is maintained for a predetermined time.
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patent: 7315151 (2008-01-01), Thompson et al.
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patent: 7759917 (2010-07-01), Ishino
patent: 7816985 (2010-10-01), Attwood et al.
patent: 2000-151297 (2000-05-01), None
patent: 2008-17353 (2008-01-01), None
Fish & Richardson P.C.
Nguyen Patricia
Rohm & Co., Ltd.
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