Title :
A New SQP Based Space-Mapping Algorithm for On-Chip Spiral Inductor Optimization
Author :
Arbabi, Navid ; Najmabadi, Mani ; Devabhaktuni, Vijay ; Yagoub, Mustapha
Author_Institution :
Concordia Univ., Montreal
Abstract :
Computer aided design (CAD) and optimization of on-chip spiral inductors is of immense interest to RFIC designers. Traditional optimization methods rely on approximate/fast "coarse models" of spiral inductors, e.g. equivalent circuits, empirical equations, etc. Naturally, the accuracy/validity of optimized results from such methods depends highly on the quality of the coarse models used. Further, the inability of such models to account for full-wave electromagnetic (EM) effects, limits their application to low-frequency circuit designs and/or necessitates additional efforts to formulate an acceptable optimization objective. The pressing need for first-pass success of CAD tools in terms of inductor design mandates consideration of full-wave EM effects within the CAD framework. Space-mapping optimization combines the speed of circuit models and the accuracy of EM simulations. In this paper, we propose a new space-mapping optimization algorithm, which exploits the sequential quadratic programming (SQP) technique for coarse model optimization. Starting with the user-specifications of the spiral inductor, the proposed algorithm yields an acceptable spiral inductor design/layout for RFIC design. The algorithm is illustrated via an on-chip spiral inductor optimization example.
Keywords :
circuit CAD; inductors; integrated circuit design; quadratic programming; radiofrequency integrated circuits; CAD tools; RFIC designers; SQP based space-mapping algorithm; coarse models; computer aided design; electromagnetic effects; inductor design; low-frequency circuit designs; on-chip spiral inductor optimization; on-chip spiral inductors; sequential quadratic programming; space-mapping optimization; Algorithm design and analysis; Design automation; Design optimization; Electromagnetic modeling; Equations; Equivalent circuits; Inductors; Optimization methods; Radiofrequency integrated circuits; Spirals;
Conference_Titel :
Electrical and Computer Engineering, 2007. CCECE 2007. Canadian Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-1020-7
Electronic_ISBN :
0840-7789
DOI :
10.1109/CCECE.2007.32