| 摘要 |
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. |
