A micropower current-mode CMOS function approximation circuit

A current-mode weak-inversion circuit for analog function approximation is proposed. It is based on the fuzzy logic paradigm and exploits a modular architecture with respect to the number of inputs and the number of rules. Simulation results show that a 2-input, 1 output transcendental function can be approximated with a 50% RMS error at the expense of 5 /spl mu/W of power consumption with a 3.3 V supply.