A VLSI implementation of fuzzy logic controller using current mode CMOS circuits

A simple fuzzy logic hardware controller based on the singleton fuzzy control algorithm is proposed. The original algorithm is modified to be suitable for hardware implementation. In the algorithm, the weighted average operation can be simplified to the weighted sum operation by introducing a new operation. Therefore, the hardware controller can be simply implemented with the current mode CMOS circuits, because the weighted sum operation requires no divider but only adders which can be easily implemented by wired connections. The high performance of the circuit, for example 200 ns total delay time, 1% maximum operation error, 3 V low supply voltage and 150 μW low power dissipation per one rule, was confirmed by SPICE simulation