Disclosed is an Amplifier ( 7 ) comprising an output driver with a first output stage ( 4 ) and a second output stage ( 5 ), where an input signal is applied non-inverted to the first output stage and inverted to the second output stage, characterized in that said input signal is applied with delay to one of the output stages ( 4, 5 ).
1. Amplifier comprising:
a Sigma-Delta modulator for receiving an input signal and outputting two output signals including a non-inverted signal and an inverted signal, the input signal having a first voltage level and a second voltage level;
a delay element for delaying one of the two output signals, a delay of the delay element being substantially equal to 1/(oversampled frequency), the oversampled frequency being the working frequency of the Sigma-Delta modulator; and
an output driver including a first output stage and a second output stage, the first output stage for receiving the delayed signal from the delay element, the second output stage for receiving the non-delayed signal among the two output signals.
2. Amplifier according to claim 1 wherein the first voltage level and the second voltage level are associated with a positive biased input voltage and a negative biased input voltage.
3. Amplifier according to claim 1 wherein the first output of the first output stage and the second output of the second output stage have a positive biased voltage and a negative biased voltage, and wherein the differential signal of the first output and the second output is approximately zero level most of the operation.
4. Amplifier according to claim 1 wherein the Sigma-Delta modulator includes a digital/analog converter (DAC).
5. Amplifier according to claim 1 , wherein a first output of the first output stage and a second output of the second output stage are applied to a load.