A review is presented of current-mode analog signal processing circuits, based on the authors' work in the area and its relation to other associated work. The authors concentrate on a more fundamental approach to the realization of current-mode performance through the development of a fully differential current-mode operational amplifier. Consideration is also given to the enhancement of conventional voltage-mode operational amplifiers in achieving current-mode performance, namely, using techniques for sensing the operational-amplifier supply current. Some encouraging new techniques based on the latter approach are described.
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