Self oscillating class D amplification device

Details Self oscillating class D amplification device Self oscillating class D amplification device

2010-02-17

2011-11-01

Mottola, Steven J (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S107000

Reexamination Certificate

active

08049557

ABSTRACT:
An amplification device, comprising a device input receiving a device input signal, an amplifier unit comprising a zero crossing detector unit, an output filter and a lead-lag compensation network. The zero crossing detector unit compares the device input signal with a reference potential and switches a pulse width modulated detector output signal between first and second voltage levels dependent on the comparison. The amplifier unit provides an actual device output signal, e.g., an amplified representation of the device input signal. The amplification device further comprises a device output providing the actual device output signal, a control loop bridging the amplifier unit and comprising a forward filter, e.g., an integrating filter, for increasing loop gain improving the signal-to-noise ratio of the actual device output signal, and a deviation detection unit detecting over modulation of the amplifier unit, so that the amplification device disables forward filter functioning upon over modulation.

REFERENCES:
patent: 6127885 (2000-10-01), Colangelo
patent: 2005/0083114 (2005-04-01), Risbo
patent: 2006/0008095 (2006-01-01), Tsuji
patent: 2008/0238543 (2008-10-01), Koch
patent: 56039606 (1981-04-01), None
Dutch Search Report and Written Opinion mailed Aug. 26, 2009 in Dutch Application No. 103660.

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