A high gain current-mode operational amplifier

Inaccurate open-loop current gain is a limitation of current-mode circuits. The authors proposed a current-mode operational amplifier (I-opamp) with high open-loop gain that provides accurate closed-loop current-gain characteristics. Negative feedback around the high-gain I-opamp produces an accurate closed-loop current gain insensitive to process, supply, and temperature variations. An analysis of the I-opamp is presented along with possible applications. A topology for a high-gain current-mode differential operational amplifier has been developed and implemented in a 2- mu m n-well CMOS process.<
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