Class D amplifier circuit

Details Class D amplifier circuit Class D amplifier circuit

2011-05-24

2011-05-24

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S010000, C330S20700P

Reexamination Certificate

active

07948313

ABSTRACT:
A class D amplifier circuit includes a signal generation section that generates a first pulse width modulation signal and a second pulse width modulation signal based on an input signal. When a level of the input signal is zero, the signal generation section generates: the first pulse width modulation signal having a repeated first wide-width pulse signal portion, which has a wide width and a repeated first narrow-width pulse signal portion, which has a narrow width which is narrower than the wide width of the first wide-width pulse signal; and the second pulse width modulation signal having a repeated second narrow-width pulse signal portion, which has a narrow width and a repeated second wide-width pulse signal portion, which has a wide width which is wider than the narrow width of the second narrow-width pulse signal portion. A rising point in time of the second narrow-width pulse signal portion occurs after a rising point in time of the first wide-width pulse signal portion and a falling point in time of the second narrow-width pulse signal portion occurs before a falling point in time of the first wide-width pulse signal portion. A rising point in time of the first narrow-width pulse signal portion occurs after a rising point in time of the second wide-width pulse signal portion and a falling point in time of the first narrow-width pulse signal portion occurs before a falling point in time of the second wide-width pulse signal portion.

REFERENCES:
patent: 7167046 (2007-01-01), Maejima
patent: 7482870 (2009-01-01), Maejima et al.
patent: 2007/0146069 (2007-06-01), Wu et al.
patent: 2006042296 (2006-09-01), None

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