Performance Simulation Involving Correlated Part Characteristics

In the analysis of an electronic circuit containing component parts on which two or more measurements are made there is the need for treating correlated part characteristics. In a performance simulation analysis using a digital computer, one must generate the correlated variables with the appropriate correlations. A method for generating a set of normally distributed variables with a given correlation matrix is presented in this paper. The method is based on an algorithm used in the square root method for solving a system of linear equations. The procedure is applied to a linear amplifier, for which the h-parameters of the equivalent dc circuit analysis of the transistor are a good example of correlated part characteristics. The method has been written in FORTRAN and the computations could be performed on almost any digital computer.