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DC operating point parameters for 28nm technology

Charanraj Mohan

Hi,

I am doing a comparison of various DC operating point parameters for 4 technologies-0.35um, 130nm, 180nm & 28nm

For this I do the following-

1. Save a file named 'saveop.scs' in the working directory, which has the below content-

save N0:oppoint

(N0 is the name of the instance (i.e. transistor) I am using in all the simulations of different technology. I should make sure that this instance name does not change in any)

2. Do a simple simulation of n-transistor (say dc linear sweep of '10m' step of gate voltage between -1 and 4 and keeping Vds=1.5V for 0.35um, 130nm & 180nm whereas Vds=0.45 V for 28nm technology. Kindly note that I am using HV transistors for 0.35um, 130nm & 180nm technologies, so the nominal supply voltage is 3.3 V, where as for 28nm the nominal supply voltage is 1 V.

3. Before simulation, I refer the 'saveop.scs' file in the setup-->model libraries of the ADE

4. Once the simulation finishes, I save my needed operating point parameters in oceanscript to take it to MATLAB for plotting. Before it, I can see the DC operating parameters when I go to Tools->Result Browser in the ADE.

Everything works fine for 0.35um, 130nm & 180nm.

But for 28nm, I don't get the DC operating points parameters. I get very few when I go to Tools->Result Browser in the ADE. There I check in 'dc'.

I want to know if the function 'oppoint' doesn't work for 28nm. If not by this way, is there a way to find the DC operating point parameters, which I can try ?

  • There's no generic problem with 28nm (or indeed any process node). It must be something to do with how the models are structured for the specific design kit you're using - it maybe that they are using subckt models, and N0 is actually a sub circuit with the transistor embedded inside - you might need to specify the additional hierarchy in the save statement.

    Regards,

    Andrew.

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