Considering layout effects early in the analog design process is becoming increasingly important. We propose techniques for estimating parasitic capacitances based on look-up tables and multi-variate linear interpolation. These models enable fast and accurate estimation of parasitic capacitances and are very suitable for use in a synthesis flow. A layout aware methodology for synthesis of analog CMOS circuits using these parasitic models is presented. Results indicate that the proposed synthesis system is fast as compared to a layout-inclusive synthesis approach.

This paper presents efficient and accurate techniques for modeling parasitic capacitances in analog CMOS circuits. A layout aware synthesis flow using these parasitic models has been proposed. The fast parasitic estimation process replaces the time consuming steps of layout generation and extraction during synthesis. Results indicate that these models are extremely fast and accurate.