Architecture of a mixed mode fuzzy controller

We present an architecture of a mixed mode fuzzy controller. This new architecture needs no A/D or D/A converters. The fuzzification and defuzzification are implemented in analog technique, while the inference unit operates in digital. So the advantages of analog and digital methods can be used. The new idea of this architecture is to use pointers instead of the analog values. So it is possible to use a digital inference unit and the analog signals can be switched directly from the fuzzification unit to the defuzzification unit without distortion by the inference unit. A prototype has been implemented using field programmable gate arrays for the digital part and Op-amps for the analog part. We used 5 membership functions for each of the 4 inputs and 5 singletons for the output. The degree of overlap of the membership functions is limited to 2