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Convergence issues in Hspice simulation

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Tiiu

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When I run a simulation with hspice,it can't reach convergence.
In the .lis file,the hspice diagnostic provided some nodes whose tol value are bigger than 1( the actual tol values are about 500).
And I found those nodes are the power supply voltage sources and the nodes where there are input waves.

how should I deal with them?

Btw, I had added 1 ohm resistor between the power supply voltage sources and gnd
 

convergence issue

which simulation you are running? If it's transient, try different solvers.
 

convergence issue

Hi,Tiiu
you can solve this problem by using solutions below. I think this will be helpful to you.
adds commands below in you including files in which simulation commands are writed.
.options gmindc=1e-10 (you can modify this value but too larger is forbidden
or you can use commands below to save dc operation points first ,and then load it
.save file=xxxxx.ic
.load file=xxxxx.ic
 

Re: convergence issue

Tiiu said:
When I run a simulation with hspice,it can't reach convergence.
In the .lis file,the hspice diagnostic provided some nodes whose tol value are bigger than 1( the actual tol values are about 500).
And I found those nodes are the power supply voltage sources and the nodes where there are input waves.

how should I deal with them?

Btw, I had added 1 ohm resistor between the power supply voltage sources and gnd
Click to expand...

let supply ramp from ground. or the start time. sometimes ok
spectre has less convergence problem,try it.
 

Re: convergence issue

Doc on SPICE convergence
 

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