Disclosed is a fully differential switched-capacitor integrator which accepts a single-ended or unbalanced input signal and compensates the offset and finite gain of the operational amplifier without an extra converter circuit. The proposed circuit utilizes a special input structure which adds special...http://www.google.com/patents/US6166581?utm_source=gb-gplus-sharePatent US6166581 - Differential integrator having offset and gain compensation, not requiring balanced inputs
