POWER SUPPLY VOLTAGE DETERMINATION METHOD FOR SEMICONDUCTOR INTEGRATED CIRCUIT AND POWER SUPPLY VOLTAGE CONTROL SYSTEM FOR SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

Provided are a power supply voltage determination method for a semiconductor integrated circuit and a power supply voltage control system for the semiconductor integrated circuit. In the power supply voltage determination method for a semiconductor integrated circuit, a power supply voltage of the integrated circuit is determined as follows: using a plurality of cell libraries constituting the semiconductor integrated circuit and process variation information, the characteristic variation of each cell included in the cell libraries is statistically analyzed; the sensitivities and mutual dependency of a plurality of parameters causing the characteristic variation of the delay time of the each cell are calculated; a characteristic monitoring circuit is mounted and a database is created in which the delay times of the all signal transmission paths in the semiconductor integrated circuit are stored; a map is created that indicates a relationship between the plurality of parameters causing the characteristic variation and the optimum power supply voltage of the semiconductor integrated circuit; using the inverse function of the response surface of a cell constituting a plurality of delay circuits, the plurality of parameters causing the characteristic variation are estimated from the output of the characteristic monitoring circuit; and the power supply voltage of the semiconductor integrated circuit is determined using the map and the estimated plurality of parameters causing the characteristic variation.