Corners Simulation in ELDO, starting from PSPice Circuit Description

[shadow222]

Hello,

I described a circuit using PSPice "script" and then simulated it in ELDO.
Now, I want to run Corners Analysis, using again ELDO and save the results in a text file.

What is the best way to do so, given the resources I have?

Thank you!

 

[erikl]

For the V and T corners you just change the voltage value of the vdc source(s) and the temperature of the whole circuit.

For the P variation you'd need appropriately changed models from the foundry. If not available, you could estimate the P variation by just changing the vth0 values -say- +/-5% (for slow/fast cases) for the industrial temp. range, or +/-10% for the mil./automotive temp. range.

 

[dick_freebird]

If you make the VT, TOX, maybe deltaL and u0 params
have variable "k" factors rather than fixed numbers then
you can arbitrarily mess them around; knowing what is
valid and what's overkill is the trick. You might even be
able to make use of gauss() and track() to do poor-boy
Monte Carlo analysis (same concerns about validity apply,
only now multivariate correlations are in the picture too).

 

[shadow222]

Hello guys,

Thank you for your replies.
I did solve the problem, sort of. What I wanted was to run all the corners automatically and get all the results in a file.
So what I did was to use a Matlab script that has some 'for' loops for VDD, TEMP, Process Corners (ff, sf...). Then I placed these 'VDD' and 'Temp' values in a file for parameters; 'Process Corners' were added in a file to be included in the library.
I then tell PSpice to include the two files for parameters and libraries in the circuit description and run the .cir file in ELDO.
By doing so, I get #VDD*#Temp*#Corners Folders, each containing simulation results.
I don't know if this is the best solution to extract Corners Results using PSpice+Eldo, because now I have to come up with a script that takes the results for each Corner and places them in one big file, Excel or some other friendly format. In particular, I will have to extract the DC Gain, GBW and PM of an Amplifier, from .chi or .wdb files.

Any ideas?

Thank you!