How can I find process mismatch parameter Avt

Hi

I need Avt mismatch value to run the mante carlo analysis.Please help to find this.

Hi,

typically the Avt and Beta mismatch parameters are given in the process design specification.
They should also be included in the bsim models, or some additional statistical file.

Hey Raja,

In the case your foundry does not provide you this data, you can extract it out by running a set of simulations. In the past, I ran >500 iterations to extract AVT for a device. Here is how the flow went,

If you have monte-carlo simulator (ADEXL or BDA), then you can create a testbench to extract AVT out. Make your "L" and "W" parameters for a standard NCH device, create a dcOp test bench. Create a measure to extract the threshold (VT) of the device for a given W/L. Once you have this, run a monte-carlo for sample size of 100 iterations. Observe the standard deviation (1-sigma) of your VTH measurements. Now, vary your W and or L and re-capture a new sigma.

If you tabulate enough points, you can try to fit the sigma_measure = AVT/sqrt(W*L) expression in Excel.

Hope this helps,

-Gujaratibhai