Design of a mixed-signal digital CMOS fuzzy logic controller (FLC) chip using new current mode circuits

A novel low voltage CMOS controllable fuzzy inference circuit

“…To overcome this problem, we have used the idea that is proposed in [23] which is a current mirror in our proposed circuit.…”

“…So far, different circuits in both WTA and LTA designs have been presented with their pros and cons. To the best of our knowledge other works up to now perform only one specific operation (Min or Max) [3,4,6,8,9,11,15,[18][19][20][21][22][23] or both operations together [1,10] that increases the power consumption and die area. In some cases such as FLC, to increase the controllability of circuit, two operations are required.…”

“…Probably, the main drawback of analog implementations is their relatively low accuracy, which does not seem a severe limitation in view of the typical demands of many fuzzy control applications [4]. On the other hand as a drawback of digital realization, we can cite a great circuit complexity, especially when they are obliged to use inference and defuzzification method that is much more accurate such as product-sum and center of area (COA) [8,23]. Despite these disadvantages of digital implementations due to the importance of the supporting microcontroller and microprocessor systems using digital data, the digital signal processing and programming has many applications in electronic industrial starters, furthermore the digital approach has the advantages of more flexibility and compatibility with digital equipment.…”

“…The logic ''AND'' and ''OR'' are generally realized by Min and Max functions. The Min-Max circuits are used in many applications such as analog signal processing, FLC [3,4,6,8,9,11,15,18,19,21,23], constant transconductance (g m ) [7], Halfwave and full-wave rectifier [1,14], signal pick detector, nonlinear signal processing applications such as nonlinear function synthesis, data acquisition, precision rectification [15]. In all of them the type of operation (Min or Max) is determined by the application.…”

An ANFIS based fuzzy controller for corner compensation

“…Mainly, multipliers are required to calculate w i s i , secondly, adders are necessary to evaluate the sum of the terms and finally, a divider is needed to extract the weighted average of the singletons. Many simple methods have been published for multiplication and summation [7][8][9]. In spite of two previous blocks, divider is a more complex one to be designed in CMOS technology which appears as a bottleneck in the WAM implementation.…”