Automatic Generation of Common-Centroid Capacitor Arrays with Arbitrary Capacitor Ratio

Authors:
M. Dessouky;D. Sayed
Affiliations:
Faculty of Engineering. Ain Shams University;El-Sarayat St., 11517 Abbaseya. Cairo. Egypt.
Venue:
Proceedings of the conference on Design, automation and test in Europe
Year:
2002

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Abstract

The key performance of many analog circuits isdirectly related to accurate capacitor ratios. It is wellknown that capacitor ratio precision is greatly enhancedby paralleling identical size unit capacitors in a common-centroidgeometry. In this paper, a general algorithm forfitting arbitrary capacitor ratios in a common-centroidunit-capacitor array is presented. The algorithm givesspecial care to both non-integer and identical ratios inorder to minimize mismatch. A method for capacitancemismatch estimation based upon an oxide gradient modelis also introduced. It enables the comparison of differentunit-capacitor array assignments. Layout issues arediscussed with emphasis on a generic routing model.Both the algorithm and the mismatch estimation methodare implemented in an automatic capacitor arraygeneration tool.