Patent attributes
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.
