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chviswanadh
Joined: 02 May 2005
Posts: 482
Helped: 188
Location: Bangalore
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 22 Aug 2006 14:32 convergence problem during DC analysis |
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Hello,
I am working on a DC-DC converter. I am using cadence spectre for simulations. My transient analysis is simulating fine but the DC analysis is giving an error saying
No DC Solution(No convergence)
Can anybody help me how to overcome this.
Thanks
Kasi
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shaikhsarfraz
Joined: 08 Aug 2006
Posts: 306
Helped: 19
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| 22 Aug 2006 14:37 Re: convergence problem during DC analysis |
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The convergence problem can be due to settings that you have to do regarding
reltol etc.
If that also doesnt work search in sourcelink, there you can find the solution to this problem
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chviswanadh
Joined: 02 May 2005
Posts: 482
Helped: 188
Location: Bangalore
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| 22 Aug 2006 14:45 Re: convergence problem during DC analysis |
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Hello shaik,
Thanks for ur reply. Is that the only option we can tryout because i have already tried that and even spoke to the cadence people. There should not be any problem what they say. Do u have anything else to say regarding this
Thanks
Kasi
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safwatonline
Joined: 19 Nov 2005
Posts: 1352
Helped: 164
Location: EGYPT
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| 22 Aug 2006 15:52 convergence problem during DC analysis |
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| maybe posting the schematic may help,
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shaikhsarfraz
Joined: 08 Aug 2006
Posts: 306
Helped: 19
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| 24 Aug 2006 13:37 Re: convergence problem during DC analysis |
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Hi Kashi,
As you have said that you are able to perform transient analysis but the DC analysis has convergence problem.
For that you can try this
Increase the value of IABSTOL in cadence simulation setup.
Also reduce the value of gmin
Actually I have also faced some problem like this so it can help you.
Thanks
Shaikh Sarfraz
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chviswanadh
Joined: 02 May 2005
Posts: 482
Helped: 188
Location: Bangalore
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| 24 Aug 2006 13:50 Re: convergence problem during DC analysis |
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Hello Shaik,
Thanks for the reply. I was initially trying to reduce loosen the tolerance but didnt increase gmin. I tried increasing it now its working fine.
Thanks
Kasi
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vbhupendra
Joined: 11 May 2005
Posts: 238
Helped: 6
Location: GOA, INDIA
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| 24 Aug 2006 17:50 Re: convergence problem during DC analysis |
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| set gmindc to larger value !
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