Patent ID: 7683708

Claim:
Digital amplifier for amplifying a digital input signal, comprising: a) a digital modulator for converting the digital input signal into an amplitude- discrete and temporally analogue signal; b) an error correction circuit which modulates the pulse widths of the amplitude-discrete and temporally analogue signal in dependence on an analogue error signal; c) a power switching stage, the input of which receives the signal modulated by the error correction circuit ( 5 ) and which delivers the modulated signal amplified on an output line; and comprising d) an analogue integrator circuit with a first signal input, at which a reference signal is present, and a second signal input which is connected to the output line of the power switching stage, wherein the integrator circuit integrates the deviation between the reference signal and the amplified signal present at the output line for calculating the analogue error signal, wherein a reference switching stage is provided which receives the output signal of the modulator and generates from this the reference signal for the analogue integrator circuit.