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Random DC voltage source generation

Hi there,

I am designing a 10 bit D/A converter and unfortunately my PDK does not support Monte Carlo Simulation.

At least to simulate the threshold voltage mismatch I am trying to create a voltage source or a set of voltage sources which will generate random voltage each time I run the transient simulation in Cadence Spectre ADE.

Then I can connect the bias node to the random dc source and then to the gate of the current source to observe the threshold voltage effect.

It is a bit urgent for me to come up with the idea to do this. It would be great if you could advice me how can I do this in Cadence?

Regards,

Tanvir

Quek over 11 years ago

Hi Tanvir

Perhaps you can try one of the following 2 methods:

a. Use an ocean script to run the simulation. The script should contain a loop to vary the input voltages randomly.

b. Manually add a statistical section in the model file and use ADE-XL to run monte carlo. This would be the easier method. E.g.

statistics {
mismatch {
vary rn1_lvt dist=gauss std=1/1
}
}

Best regards
Quek
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Tanvir100 over 11 years ago

Dear Quek,
Thanks for your suggestions. Unfortunately I am using IC 5.1 and I am not familiar witrh writing my own Ocean script. Feeling a bit odd.
Would you please tell me is there anything in your mind ? May be with Verilog A?
Any kind of advice is appreciated.
Kind regards,
Tanvir
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Frank Wiedmann over 11 years ago

Andrew Beckett has given you a more detailed answer at http://www.designers-guide.org/Forum/YaBB.pl?num=1392438653/1#1.
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