A new CMOS differential difference current conveyor and its applications

A new CMOS realization of differential difference current conveyor (DDCC) is presented. The negative feedback action is introduced by using a current mirror to reduce channel length modulation effect of MOS transistors. Furthermore, the circuit is insensitive to the threshold voltage variation caused by the body effect of MOS transistors. Compared with the conventional design, the proposed DDCC circuit has less harmonic distortion and larger linear range. A voltage-mode filter, which simultaneously provides band-pass, high-pass, and low-pass functions, is also described. The proposed DDCC circuit is quite useful as a powerful building block of current-mode circuits because of its high performance, and its application employs fewer passive elements. SPICE simulations confirm the excellent properties of the proposed circuits.