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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Monte Carlo Analysis >
   Monte Carlo Analysis Netlist Syntax >
       Defining a Monte Carlo Netlist Parameter >
           Gaussian Distribution with Absolute Spread

Gaussian Distribution with Absolute Spread

To define a Monte Carlo netlist parameter with Gaussian distribution and absolute spread, use the following syntax:

.PARAM name=AGAUSS(mean, abs_spread[, num_sigma][, multiplier])

Monte Carlo values will be generated from a Gaussian distribution with standard deviation:

σ = abs_spread/num_sigma

If num_sigma is not specified, the default is 3, so that the spread represents three standard deviations.

If a multiplier is specified, that many values will be generated, the value that has the highest absolute deviation from the mean will be used in the simulation, and the other values will be discarded. The default is to do one selection.

For example, to define a Gaussian distribution with a mean of zero and a standard deviation of 1 (a “normal” distribution) using an absolute spread:

.PARAM D1=AGAUSS(0, 3, 3) // Normal distribution

The num_sigma entry defaults to 3, so it can be omitted from the example:

.PARAM D1=AGAUSS(0, 3) // Also the normal distribution

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