Implementing a fuzzy system on a field programmable gate array

Fuzzy controllers are traditionally implemented in a microprocessor and they produce relatively raw surfaces. The purpose of this work is to implement a fuzzy control system in a FPGA and to have the resulted control surface as smooth as possible. The FPGA has allowed designers to create large designs, test them and make modifications very easily and quickly. This approach uses a new weighted average concept to keep the fuzzy lookup table small, yet the input sizes can be large. This is implemented by using three or four most significant bits of each input to determine the address for the lookup table. A weighted average is performed using the remaining bits to eliminate rawness.