Sc-integrator with switchable polarity

An SC-integrator with reversible polarity, said integrator comprising at least a first switch arrangement and an integration arrangement;

• wherein said integration arrangement comprises an amplifier having an inverting input and a non-inverting output Vo, and at least a first circuit network to which said amplifier is connected, said first circuit network comprising an integration capacitor C.sub.i, a storage capacitor C.sub.s having first and second terminals, and first and second switches, said non-inverting output Vo of said amplifier being connected via said integration capacitor C.sub.i to said inverting input of said amplifier, said first terminal of said storage capacitor C.sub.s being connected to ground and said second terminal of said storage capacitor C.sub.s being connected on the one hand to said non-inverting output Vo of said amplifier via said first switch, and on the other hand to said first switch arrangement via said second switch;
• wherein said first switch arrangement comprises a circuit capacitor C.sub.f having first and second terminals, and third, fourth, fifth, sixth and seventh switches, said first terminal of said circuit capacitor C.sub.f being connected to ground via said third switch and connected via said fourth switch to said inverting input of said amplifier, said second terminal of said circuit capacitor C.sub.f being connected via said fifth switch to an input voltage Vin and via said sixth switch to a further voltage potential Vm, and said first switch arrangement being connected via said seventh switch to a reference voltage Vref;
• and
• wherein said second terminal of said storage capacitor C.sub.s is connected directly to said first terminal of said circuit capacitor C.sub.f via said second switch, such that the polarity of the voltage across said integration capacitor C.sub.i is reversed by the action of said storage capacitor C.sub.s connected in parallel with said circuit capacitor C.sub.f.