Selection of MOSFET Sizes by Fuzzy Sets Intersection in the Feasible Solutions Space

作者：Polanco Martagon S; Reyes Salgado G; Flores Becerra G; Tlelo Cuautle E; de la Fraga L G; Guerra Gomez I; Duarte Villasenor M A

来源：Journal of Applied Research and Technology, 2012, 10(3): 472-483.

• Fuzzy sets
• fuzzy set intersection
• circuit sizing
• analog circuits
• MOSFET
• evolutionary algorithms

A fuzzy sets intersection procedure to select the optimum sizes of analog circuits composed of metal-oxidesemiconductor field-effect-transistors (MOSFETs), is presented. The cases of study are voltage followers (VFs) and a current-feedback operational amplifier (CFOA), where the width (W) and length (L) of the MOSFETs are selected from the space of feasible solutions computed by swarm or evolutionary algorithms. The evaluation of three objectives, namely: gain, bandwidth and power consumption; is performed using HSPICE (TM) with standard integrated circuit (IC) technology of 0.35 mu m for the VFs and 180nm for the CFOA. Therefore, the intersection procedure among three fuzzy sets representing "gain close to unity", "high bandwidth" and "minimum power consumption", is presented. The main advantage relies on its usefulness to select feasible W/L sizes automatically but by considering deviation percentages from the desired target specifications. Basically, assigning a threshold to each fuzzy set does it. As a result, the proposed approach selects the best feasible sizes solutions to guarantee and to enhance the performances of the ICs in analog signal processing applications.

• 出版日期2012-6