Patent ID: 7308467
Filing Date: 2007-12-11
Classification: G06F

Abstract:
1. A computer implemented method for numeric simulation of an electric circuit influenced by noise, comprising the steps of: numerically simulating the electric circuit using a model including input channels, noise input channels and output channels, the behavior of the input channels and of the output channels being described by a system of differential equations or a by a system of differential algebraic equations; in the numerical simulation step, calculating an output vector for an input vector present on the input channels and a noise vector y of 1/f distributed random numbers present on the noise input channel, wherein generation of the noise vector y includes the steps of: determining a desired spectral value β; determining a number of the random numbers of the 1/f noise to be generated; determining an intensity constant const; setting a starting value for a running variable n; performing a loop-type repetition until a desired number of elements y(n) of a vector y of length n is calculated from 1/f-distributed random numbers, by the steps of: determining an inverted covariance matrix C determining a variable σ in accordance with where sqrt denotes a square root function, and e(n,n) denotes an element of the inverted covariance matrix C determining a (0,1)−normally distributed random number which forms an nth component of a vector x of length n; forming a variable μ from first (n−1) components of an nth row of the inverted covariance matrix C where y calculating an element y(n) of the vector y of length n from the 1/f-distributed random numbers, according to: outputting the at least one sequence of random numbers of 1/f noise.