A CMOS rail-to-rail differential voltage current conveyor and its applications

This paper presents a new CMOS realization of differential voltage current conveyor (DVCC). Rail-to-rail voltage range operation is implemented by using N-type and P-type differential difference input stages. An adaptive voltage offset cancellation technique is presented to ensure exact voltage following performance for rail-to-rail dynamic range. SPICE simulations confirm that the proposed DVCC achieves a rail-to-rail swing under ±2.5 V power supplies and shows the exact voltage and current following performances. The application of the proposed DVCC, which simultaneously provides band-pass and low-pass functions, is also described. Because of its high performance, the proposed DVCC circuit is quite useful as a powerful building block for current-mode circuits.