A high performance class AB current conveyor

A class AB CMOS current conveyor is developed for wideband current-mode signal processing, It consists of a differential stage for the voltage input, a single-ended push-pull stage for the current input, and current mirrors for the current output. The differential and push-pull stages form a unity-gain buffer, to realize exact voltage-following action and low impedance at the current input node. Simulations based on a 0.6 /spl mu/m CMOS process show that the impedance at the current input node is 3.5 /spl Omega/ and the current and voltage transfer characteristics extend beyond 100 MHz. This performance and the low power consumption are quite satisfactory for most applications.

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