Stats

Locked Locked
Replies 2
Subscribers 126
Views 20745
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

DC convergence problem

Hi all,

I am having some dc convergence problems. I would like to ask what's the best way to overcome those convergences problems?

I have got some ideas. I could set a node voltage (the one that is giving problems) to a certain value to help the simulation to convergence. But I don't know how to do this. Besides, how can I know which nodes are causing this?

I read on the spectre.out report that we can set the diagnose to yes as well as inventory to detailed. However I couldn't find those 2 options in the ADEL simulator GUI.

Another option could be use the transient simulation results as a starting point for the DC simulation. Again, don't know how to do this.

Can someone help me out please?

Regards.

Andrew Beckett over 8 years ago

Perhaps a good start would be to read this book: The Designer's Guide to SPICE and Spectre

Andrew.
Cancel
Vote Up 0 Vote Down

Cancel
Johanny Saenz over 8 years ago

Hi.

It depends on the kind of circuit that you are runninh. My suggestions are:

- In general set the detailed report for convergence debug on Analog options.
- For circuits where the start up is critical or could have multiple DC solutions : Try all homotopy options or just ramp up VDD.
- Set some initial conditions or nodesets on known nodes.
- Try a transient analysis in order to see problematic voltages/currents

Johanny
Cancel
Vote Up 0 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.