Digital amplifier

Details Digital amplifier Digital amplifier

2007-10-23

2007-10-23

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

11262512

ABSTRACT:
A digital amplifier (1) comprising a first modulation stage (9) arranged to receive a digital data signal and to generate a corresponding modulated reference signal; a comparator (12) arranged to receive a feedback signal and the modulated reference signal and generate a corresponding error signal (13) indicative of a difference between the modulated reference signal and the feedback signal; an integration stage (44) arranged to integrate the error signal (13) from the comparator (12) to generate an integrated digital error signal; a summer (19) arranged to receive the integrated digital error signal and the digital data signal (8) and generate an adjusted digital data signal indicative of their sum; an output stage comprising a second modulation stage, the output stage being arranged to receive the adjusted digital data signal and to generate a corresponding modulated output signal for driving a load (7); and a feedback circuit arranged to provide said feedback signal to the comparator (12), the feedback signal being indicative of the modulated output signal.

REFERENCES:
patent: 5777512 (1998-07-01), Tripathi
patent: 5974089 (1999-10-01), Tripathi et al.
patent: 6300825 (2001-10-01), Dijkmans et al.
patent: 6646502 (2003-11-01), Kruiskamp
patent: 7157969 (2007-01-01), Candy
patent: 2004/0046680 (2004-03-01), Masuda
patent: 2004/0131193 (2004-07-01), Kitamura
patent: 2004/0165661 (2004-08-01), Braun
patent: 2007/0040608 (2007-02-01), Magrath et al.
patent: WO 02/078179 (2002-10-01), None
patent: WO 02/089321 (2002-11-01), None
patent: WO 2004/049561 (2004-06-01), None

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