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CMOS Current-mode Operational Amplifier

Thomas Kaulberg

Abstract

A fully differential-input differential-output current-mode operational amplifier (COA) is described. The amplifier utilizes three second generation current-conveyors (CCII) as the basic building blocks. It can be configured to provide either a constant gain-bandwidth product in a fully balanced current-mode feedback amplifier or a constant bandwidth in a transimpedance feedback amplifier. The amplifier is found to have a gain bandwidth product of 8 MHz, an offset current of 0.8 μA (signal-range ±700 μA ) and a (theoretically) unlimited slew-rate. The amplifier is realized in a standard CMOS 2.4 μm process.

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Available abstract

Key concepts: Transimpedance amplifier, Direct-coupled amplifier, Operational transconductance amplifier, Operational amplifier, Current-feedback operational amplifier, Fully differential amplifier, Input offset voltage, Gain–bandwidth product