Huertas J., Sanchez-Solano S., Baturone I. and Barriga A., "Integrated circuit implementation of fuzzy controllers", 1EEE JSSC, 1996, Vol. 31, N 7, pp. 1051 - 1058.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....3 b) Therefore, the output current Iout of the D A is equal to: Cn 1)i 2 Ii ) C0)i 2 n Ii ) cti Ii. 7) First ideas on common weighting can be found in [11] Most approaches found in the literature to perform this operation use one individual weighting operator per rule [2] [6]. With the common D A used here, a big saving of silicon area can be obtained compared to the local D A approach. On the other hand, also in our case, the input capacitance of each consequent is reduced by a factor (2n n l) Additionally, since the layout of the whole defuzzifier becomes smaller ....

....M9, M12. In this way, the following relation holds [4] IN (Vout Vbo) Vo = Vbl Vbo) 8) ID Thus, if Vout is referred to Vbo a two quadrant divider is obtained. Since this divider behaves as a transresistor, there is no need for extra interface converter circuits neither at the inputs [6] nor at the output [7, 8] Figure 4 b) displays some measured characteristics using a HP4145B equipment. Figure 4 c) ilustrates the measured relative errors.The output offset (when IN=0) is lower than 1.6mV. 3. Experimental results In the fabricated two inputs, one output, nine fixed rules ....

Huertas J., Sanchez-Solano S., Baturone I. and Barriga A., "Integrated circuit implementation of fuzzy controllers", 1EEE JSSC, 1996, Vol. 31, N 7, pp. 1051 - 1058.

....the following relation holds [4] I I Vbo) Vb1 Vo Vbo) Vout D N = 7) Thus, if Vout is referred to Vbo a two quadrant divider is obtained. Since this divider behaves like a current to voltage converter, there is no need for extra interface converter circuits neither at the inputs [6] nor at the output [7, 8] Figure 7 displays some measured results using a HP4145 equipment. Relative errors are below 2 . The output offset (when IN=0) is lower than 1.6mV. The division operation does not take more than 60ns to be performed. 3. Performance and conclusions In the fabricated ....

Huertas J., Sanchez-Solano S., Baturone I. and Barriga A., "Integrated circuit implementation of fuzzy controllers", IEEE JSSC , 1996, Vol. 31, N 7, pp. 1051 - 1058.

....feedback path of an inverting amplifier. Performance of these multiplier dividers depends primarily on the performance of the multiplier and the amplifier employed. Precision is mainly limited by offsets associated with the input and output variables [3] 14] 15] The analog fuzzy chips reported in [4 7] contain this type of multiplier dividers. An alternative solution is the successive approximation technique that employs two accumulators, as shown in Figure 1 [16] The master accumulator approximates the value of the input signal, x num , after N steps: 1) where x den is a reference signal and ....

J. L. Huertas, S. Snchez Solano, I. Baturone, A. Barriga, "Integrated circuit implementation of fuzzy controllers", IEEE Jour. of Solid-State Circuits, vol. 31, no. 7, pp. 1051-1058, July 1996.

....CONS s, that define the singletons of the consequents and implement the fuzzy implication operation (the product h i . c i ) d) A current mode divider, DIV, that calculates the output following Equation (1) The MFC, MAX and CONS blocks are based on the structures described by the authors in [3]. Some analog realizations implement each rule with its own MFC, MIN, and CONS blocks [4] Another solution is to share the MFC and CONS blocks by all the rules, thus avoiding to replicate blocks that appear in different rules. This type of architecture is aimed to implementing typical fuzzy ....

....as an autonomous and flexible adaptive controller should incorporate capability of long term storage of the analog or digitally programmed parameters. A well known problem for hardware implementation of analog neural networks is the lack of an efficient long term storage mechanism. As described in [3], an efficient way to program the antecedent membership functions and the singleton values of the consequents is to replace the involved current mirrors by digitally programmable mirrors, i.e. current mode DAC s. Hence, the inclusion of longterm memory is straight forward via digital memory ....

J. L Huertas, S. Snchez-Solano, I. Baturone, and A. Barriga, "Integrated Circuit Implementation of Fuzzy Controllers", IEEE J. Solid-State Circuits, Vol. 31 (7), pp. 1051-1058, July 1996.

....in two categories considering the implementation techniques that have been utilized. The use of analog techniques allows the realization of fuzzy chips with a good silicon area inference speed ratio, and does not require the inclusion of interfaces to connect with analog sensors or actuators [1 4]. On the other hand, the digital approach offers the advantages derived from using well established design methodologies, which ease the programmability of the systems and their interconnection with conventional processing environments [5 7] The implementation of low cost high speed digital fuzzy ....

J. L. Huertas, S. Sánchez-Solano, I. Baturone, A. Barriga, "Integrated Circuit Implementation of Fuzzy Controllers", IEEE Journal of Solid-State Circuits, vol. 31, no. 7, July 1996, pp. 1051-1058.

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