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convergence problem during DC analysis

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chviswanadh

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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
 

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
 

    chviswanadh

    Points: 2
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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
 

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
 

    chviswanadh

    Points: 2
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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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