A CMOS Rail-to-Rail Current Conveyer and Its Applications to Current-Mode Filters

摘要

A second-generation CMOS current conveyor (CCII) consisting of a rail-to-rail complementary N- and P-channel differential input stage for the voltage input, a class AB push-pull stage for the current input, and current mirrors for the current outputs is developed. The CCII was implemented using a double-poly triple-metal 0.6 μm n-well CMOS process, to confirm its operation experimentally. A prototype chip achieves a rail-to-rail swing +-2.4V under +-2.5 V power supplies and shows the exact voltage and current following performances up to 100 MHz. These performances make the CCII proposed herein quite useful for a building block of current-mode circuits. The prototype CCII is applied to current-mode filters to demonstrate the wideband signal processing capabilities.