Class-D amplifier

Details Class-D amplifier Class-D amplifier

2011-05-31

2011-05-31

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P, C330S010000

Reexamination Certificate

active

07952432

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: 2006262104 (2006-09-01), None
patent: 2007124624 (2007-05-01), None
patent: 2007124625 (2007-05-01), None

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