Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2011-04-26
2011-04-26
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S010000
Reexamination Certificate
active
07932779
ABSTRACT:
A D-class amplifier that can suppress noise generated when a D-class amplification operation is started/stopped. When a D-class amplification operation is started/stopped, the pulse widths and pulse interval of output signals Pout1, Pout2are gradually changed, so it is possible to prevent a large variation in the signal fed as a differential signal of output signals Pout1, Pout2to the load, and it is possible to reduce noise. That is, by gradually changing the pulse interval while keeping the pulse widths of output signals Pout1, Pout2constant, it is possible to suppress variation in the relatively high frequency component corresponding to the component of the pulse signal. Also, by gradually changing the widths of output signals Pout1, Pout2while keeping the pulse interval constant, it is possible to suppress variation in the relatively low frequency component corresponding to the average value of the pulse signal.
REFERENCES:
patent: 6998911 (2006-02-01), Honda et al.
patent: 7312654 (2007-12-01), Roeckner et al.
Ido Toru
Ishizuka Soichiro
Brady III Wade J.
Nguyen Khiem D
Pascal Robert
Patti John J.
Telecky , Jr. Frederick J.
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