In a delay-power-source-coefficient determining step, a drain saturation current in a P-channel MOSFET is calculated on the basis of specified operating power-source voltage data and of saturation-current parameters such as the mobility of carriers and the thickness of a gate oxide film based on said...http://www.google.de/patents/US6604066?utm_source=gb-gplus-sharePatent US6604066 - Method and apparatus for calculating delay for logic circuit and method of calculating delay data for delay library