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Ultrasim options setting (Read 8723 times)
Senior Member

Posts: 174
Ultrasim options setting
Feb 08th, 2007, 5:21am

In AMS Options of Hierarchy Editor one can change following settings:
1. Simulation Mode
2. Analog
3. Speed
4. MOS method
5. Diode method

These settings are global - for whole design.
But locally (in Cell Bindings window or in Tree View window) one can change only 2 settings
1. Simulation Mode
2. Speed

According to my actual experience, the most important setting (in sense of accuracy and speed) is MOS method.
If I choose Spice for MOS method, I have impression, that Ultrasim is slowly than Spectre.
If I need MOS method - Spice only for small part of schema what should I do?


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Posts: 46

Re: Ultrasim options setting
Reply #1 - Feb 9th, 2007, 10:58pm
I think you can use sim_mode=a or sim_mode=s to use table model or Spice model respectively.

By the way, in what sitiation that you must have the accuracy of Spice model?

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Re: Ultrasim options setting
Reply #2 - Jun 19th, 2007, 4:18am
I guess setting the ultrasim option for mos_method in the schematic view would solve your problem. This will override the global option set for mos_method.

My suggestion would be to declare the mos_method as a string in the instance property and add the appropriate value s.(for spice).

And check the "Allow usim_opt on schematic" in the ultrasim simulator options.

I haven't tried this. But hope this will work.

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