Class D amplifier

Details Class D amplifier Class D amplifier

2007-11-13

2007-11-13

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P

Reexamination Certificate

active

11094229

ABSTRACT:
The class D amplifier comprises a differential signal output unit for outputting differential signals from voice signals which are input from the input terminal, and the P-side and the N-side charge balanced type class D amplifiers to which the differential signals are output. Each charge balanced type class D amplifier comprises a PWM waveform generation circuit which is comprised of an integrating amplifier and a Schmitt trigger circuit, a level shift circuit for shifting the level of the PWM signals, an output buffer for amplifying the level-shifted signals, and a feedback circuit for feeding back the output of the output buffer negatively to the integrating amplifier. The feedback circuit is constructed such that the feedback amount is variable depending on HIGH or LOW of the output of the output buffer by selecting a predetermined resistance depending on HIGH or LOW.

REFERENCES:
patent: 4673889 (1987-06-01), Cini et al.
patent: 4949048 (1990-08-01), Tokumo et al.
patent: 5115205 (1992-05-01), Holmes, Jr.
patent: 6448851 (2002-09-01), McIntosh et al.
patent: 2003/0030486 (2003-02-01), Noro et al.
patent: 1 239 922 (1971-07-01), None
patent: 2003-115730 (2003-04-01), None

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