A circuit design block is proposed which vastly simplifies analog circuit design in addition to performing all functions of an operational amplifier. A third input is added to the op-amp, which follows the potential on the noninverting input and effectively accepts a current input. This current is subsequently inverted in polarity and added to the inverting input. Several applications are described, including noninverting integrators and differentiators and a differential summing amplifier. While implementation of this function is possible in many ways, a simple technique using a modified op-amp technology is described. Extension to class AB operation is also discussed.
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