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How to do parametric analysis in maestro

designPMT

Hi,

I am trying to do parametric analysis on width of pmos by following steps

1. First i created a circuit using Ipar parameter

2. Created symbol and passed the parameters in CDF

Now I am using the the symbol to create new test bench and passing the parameters in maestro by selecting parameters of symbol passed in properties section . But I am getting following error

myckt.mpo effective width is off grid 1e-7(myckt is symbol instance name)

I am giving parametric range like 200n to 300n with 20 steps.

Thanks,

Manoj 

Parents

  • Dear Manoj,

    I am not sure what technology (PDK) you are using nor what specific technology node. Hence. my comment may not be relevant. Nevertheless, for many recent submicron technology nodes, the channel widths are discrete and a device can only be realized with specific values. Hence, when you attempt to simulate using effective widths of [200n, 210n, 220n...,290n,300n], some of the values may not be valid values for your pmos model. This might explain the error message "off grid" as it suggests some of the width values you are attempting to netlist and simulate  are not consistent with the allowed values.

    Does this make sense to you Mano? 

    Shawn

Reply

  • Dear Manoj,

    I am not sure what technology (PDK) you are using nor what specific technology node. Hence. my comment may not be relevant. Nevertheless, for many recent submicron technology nodes, the channel widths are discrete and a device can only be realized with specific values. Hence, when you attempt to simulate using effective widths of [200n, 210n, 220n...,290n,300n], some of the values may not be valid values for your pmos model. This might explain the error message "off grid" as it suggests some of the width values you are attempting to netlist and simulate  are not consistent with the allowed values.

    Does this make sense to you Mano? 

    Shawn

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