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DATE
2002
IEEE

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

10 years 4 months ago
Automatic Generation of Common-Centroid Capacitor Arrays with Arbitrary Capacitor Ratio
The key performance of many analog circuits is directly related to accurate capacitor ratios. It is well known that capacitor ratio precision is greatly enhanced by paralleling identical size unit capacitors in a commoncentroid geometry. In this paper, a general algorithm for fitting arbitrary capacitor ratios in a common-centroid unit-capacitor array is presented. The algorithm gives special care to both non-integer and identical ratios in order to minimize mismatch. A method for capacitance mismatch estimation based upon an oxide gradient model is also introduced. It enables the comparison of different unit-capacitor array assignments. Layout issues are discussed with emphasis on a generic routing model. Both the algorithm and the mismatch estimation method are implemented in an automatic capacitor array generation tool.
Mohamed Dessouky, DiaaEldin Sayed
Added 14 Jul 2010
Updated 14 Jul 2010
Type Conference
Year 2002
Where DATE
Authors Mohamed Dessouky, DiaaEldin Sayed
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