HSPICE error message please help.

[ravichandar]

Hi, I am trying to simulate the ADC i have designed using Hspice. I have a clock running at 20Mhz. i.e a period of 50 ns. I need the simulation to run till 100 milli seconds becuase i am using a current mirror ramp generator for generating a ramp vooltage which requires that much time for producing a ramp output as i am using a 1 uf capacitor for charging.

When i try to simulate in Hspice using .Tran 1n 1m ( i ran it for 1 milli sec with a step of 1 ns) ( i tried a step of 10ns also)

it takes 4-5 hours for simulation and then it stops with an error message saying
**error** error happens when writing waveform for POST=1
time: command terminated abnormally.

Is it because of the memory problem? Can anybody please help how to solve this issue?

Thanks,
RC.

 

[ashish_chauhan]

CAN YOU TELL Y ARE YOU USING POST=1??

I WOULD SUGGEST TO USE ONLY POST. AND RUN UR TRANSIENT AS

.TRAN 100N 1M

(I MEAN IN STEPS OF 100NANO FOR 1 MILI)

ALSO USE PROBE STATEMENT AND SAVE ONLY THOSE NODE VOLTAGES AND CURRENTS WHICH R OF IMPORTANCE. THIS WILL CONSUME LESSER MEMORY

HOPE THIS HELPS YOU.

 

[ravichandar]

Hi,

Thanks for your reply. I am using only .options POST

And i tried running in steps of 100n as well which is taking almost the same time and giving the same message.

I did not use any .probe statement so that means it records all the values at all point of time?

Regards,
RC