A CMOS current-mode operational amplifier

Thomas Kaulberg

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A fully differential-input, differential-output, current-mode operational amplifier (COA) is described. The amplifier utilizes three second-generation current conveyors (CCIIs) 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 3 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
Original languageEnglish
JournalI E E E Journal of Solid State Circuits
Issue number7
Pages (from-to)849-852
Publication statusPublished - 1993

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