Patent ID: 7884662

Claim:
A multi-channel integrator comprising: a first switch having a first terminal receiving a first reference voltage; a second switch having a first terminal receiving the first reference voltage; and a plurality of integration units, wherein each of the integration units comprises: an operational amplifier (OP-AMP) having a first input terminal, a second input terminal and an output terminal, wherein the second input terminal receives a second reference voltage; a feedback switch having a first terminal and a second terminal respectively coupled to the first input terminal and the output terminal of the OP-AMP; a third switch having a first terminal coupled to the first input terminal of the OP-AMP; a fourth switch having a first terminal coupled to the output terminal of the OP-AMP; and a feedback capacitor having a first terminal coupled to a second terminal of the first switch and the second terminal of the third switch, the second terminal of the feedback capacitor coupled to a second terminal of the second switch and the second terminal of the fourth switch.