A silicon compiler of analog fuzzy controllers: from behavioral specifications to layout

In this paper, a silicon compiler for analog fuzzy controllers is described. The layout is generated automatically, starting from global-system specifications accepted as a set of classical fuzzy rules involving fuzzy sets as well as numerical data, often available from numerical examples. The system relies on a library of basic cells designed using a CMOS n-well 0.7 μm technology and on the use of Cadence software. Multi-inputs multi-outputs fuzzy logic-based controllers are synthesized, and the area and power requirements by any specific application are optimized. Some prototypes designed using the proposed methodology have been fabricated. For example, a two-inputs two-outputs fuzzy controller implementing a 2D rational function and a sinusoidal function requires, including the I/O circuitry, 1.9 mm² of silicon area, and the total power consumption is 44 mW at 5 V power supply. The maximum propagation delay, assuming a step input function, is 0.57 μsec. The total computation time using a SUN Sparc2 Workstation is about 25 min, from specification of the expected behavior to layout