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question about continuation methods (Read 3958 times)

RobertZ

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the art of analog

Posts: 55
San Diego, CA

question about continuation methods
Jun 20^th, 2005, 5:14pm

Hi, all,

In a DC operation point simulation, the simulator tried "homotopy = gmin" first and failed; then it tried "homotopy = source" and failed again; at last, it tried "homotopy = dptran" and successed.

So, in the above situation, do I need to change some settings of the simulator, or do I need to re-design my circuit?

I have read the 2nd chapter of Ken's book, but not found the answer of my questions.

Any commends are welcome!!

Thanks advance.
-driveforce

Thanks,
Robert

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Ken Kundert

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Silicon Valley

Re: question about continuation methods
Reply #1 - Jun 20^th, 2005, 6:35pm

You have two choices.
1. You can do nothing. This is by far the most popular choice.
2. You can set homotopy=dptran on the DC analysis. This would cause subsequent dc analyes to run a bit faster.

Do not re-design your circuit. The fact that a particular homotopy method does or does not work on you circuit is no reflection on the quality of the circuit.

-Ken

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RobertZ Community Member Offline the art of analog Posts: 55 San Diego, CA	Re: question about continuation methods Reply #2 - Jun 20^th, 2005, 7:00pm Thank you, Ken, -driveforce
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