Fast computation of substrate resistances in large circuits
A.J. van Genderen, Nick P. van der Meijs, Theo Smedes · 1996
In this paper, we describe a method to quickly and accurately estimate substrate coupling effects in analog and mixed digital/analog integrated circuits. Unlike numerical methods, that can be used for circuits containing only a few hundreds of substrate terminals, the new method can quickly extract circuits containing many thousands of substrate terminals. Examples are given that show that the method is sufficiently accurate for practical circuit verification. The method has been implemented in the layout-to-circuit extractor Space. 1 Introduction In modern analog circuits and mixed digital/analog circuits, coupling effects via the substrate can be an important cause of malfunctioning of the circuit. This problem becomes more prominent as (1) there is a trend to integrate more and more different components on a chip, (2) the decrease of wire width and increase of wire length causes the interconnect parasitics and hence the level of noise on the chip to increase, and (3) the use of l...