Method, apparatus and system for reducing DC coupling...

Details Method, apparatus and system for reducing DC coupling... Method, apparatus and system for reducing DC coupling...

2007-08-13

2009-10-13

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S010000, C330S20700P

Reexamination Certificate

active

07602245

ABSTRACT:
A digital amplifier, a reference voltage generator for reducing a DC component of an amplified pulse width modulated signal of a digital amplifier, and a method of reducing a DC component of an amplified pulse width modulated signal applied to an input node of a load are described in this disclosure. The digital amplifier includes a pulse width modulation signal generator receiving an input signal and generating an amplified pulse width modulated signal, a filter filtering the amplified pulse width modulated signal and providing the filtered amplified pulse width modulated signal to an input node of a load, and a reference voltage generator providing a reference voltage to a reference node of the load to reduce a DC component of the filtered amplified pulse width modulated signal provided to the input node of the load.

REFERENCES:
patent: 7116168 (2006-10-01), Makino et al.
patent: 7161421 (2007-01-01), Honda
patent: 2004-242240 (2004-08-01), None
patent: 2005-159871 (2005-06-01), None
patent: 1020050032292 (2005-04-01), None
patent: 2006-0011934 (2006-02-01), None
patent: WO 2006/031304 (2006-03-01), None
patent: WO 2006/031304 (2006-03-01), None
patent: WO 2006/059956 (2006-06-01), None
UK Search Report dated Dec. 6, 2007.

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