Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2010-02-25
2011-10-18
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S010000
Reexamination Certificate
active
08040184
ABSTRACT:
A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation circuit that outputs a digital signal having a pulse width corresponding to a level of the integration value signal, an output buffer that drives a load based on the digital signal, a feedback section that feeds an output signal of the output buffer into the differential integrator as the feedback signal, a clamp section that performs a clamping of limiting the level of the integration value signal within a specified level range, an attenuation section that attenuates the level of the input signal to be input to the differential integrator in response to an attenuation command, and an attenuation control section that outputs the attenuation command to the attenuation section in response to the clamping performed by the clamp section.
REFERENCES:
patent: 5815581 (1998-09-01), Andersson
patent: 7167046 (2007-01-01), Maejima
patent: 7482870 (2009-01-01), Maejima et al.
patent: 2007/0103234 (2007-05-01), Maejima et al.
patent: 2006262104 (2006-09-01), None
patent: 2007124624 (2007-05-01), None
patent: 2007124625 (2007-05-01), None
patent: 2007-0036008 (2007-04-01), None
Korean Intellectual Property Office “Notice of Submission of Argument” re Application No. 10-2010-0017903 dated Apr. 25, 2011, 3 pages.
Choe Henry K
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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