Class D-amplifier

Amplifiers – With semiconductor amplifying device – Including class d amplifier

Reexamination Certificate

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Details

C330S20700P

Reexamination Certificate

active

11153658

ABSTRACT:
A class D-amplifier which amplifies an input signal applied to an signal input of said amplifier (21) to generate an amplified signal output by an signal output (28a,28b) of said amplifier comprising a comparator (23) which compares the applied input signal with a switch signal to generate a pulse width modulated signal; a driving unit (24) which amplifies the pulse width modulated signal to generate the amplified output signal; and a feedback circuit which generates the self oscillating switch signal for the comparator (23).

REFERENCES:
patent: 3743954 (1973-07-01), Snedkerud
patent: 4949048 (1990-08-01), Tokumo et al.
patent: 6016075 (2000-01-01), Hamo
patent: 6232833 (2001-05-01), Pullen
patent: 7076070 (2006-07-01), Pearce et al.
patent: 2004/0027196 (2004-02-01), Lambruschi et al.
patent: 2274420 (2000-11-01), None
patent: 10228575 (2004-01-01), None
patent: 10231183 (2004-01-01), None
European Search Report and Written Opinion dated Dec. 2004.

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