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Nexxim Simulator >
Nexxim Monte Carlo Analysis >
   Monte Carlo Analysis Netlist Syntax >
       Defining a Monte Carlo Netlist Parameter >
           Uniform Distribution with Relative Bounds

Uniform Distribution with Relative Bounds

To define a Monte Carlo netlist parameter with uniform distribution and relative bounds, use the following syntax:

.PARAM name=UNIF(nominal_value, relative_bound [, multiplier])

Monte Carlo values will be generated from a uniform distribution in the range:

-(nominal_value × relative_bound) to +(nominal_value × relative_bound)

If a multiplier is specified, that many values will be generated, the value that has the highest absolute deviation from the nominal value 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 uniform distribution with a nominal value of 10 and a relative range of plus or minus 5%:

.PARAM D1=UNIF(10, 0.05)

A relative distribution cannot have a nominal value of zero. To create an actual distribution with relative range and nominal value zero, you could use a secondary variable:

.PARAM D1=UNIF(10, 0.05)
.PARAM ACTUAL_D1='D1 - 10'

Alternatively, you could use the expression to set the instance or model parameter:

R21 Vin 0 R='1000 + (D1 - 10)'

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