Hello all I am facing a problem with spice (approaching max data size problem, (I am working with RDAC, facing this while simulating 10bit DAC output. If anyone knows a way around it, kindly let me know.

Do you have a

save

statement in your spice control block? Please try adding a line reading

save din0 din1 din2 ...

with the voltages and currents you wish to save, and which you need for analysis. Otherwise, ngspice will try saving everything, which occupies a lot of memory and slows down the sim.

like . save din0 din1 din2 or just save din0 din1 din2 ...

It should be a list of any variables you want to plot or measure. Ngspice will only save the variables you list. If you use a net name, it will save the voltage on that node.

Ok will try this

For mine, I've been putting the

save

statement before the

tran

statement, and all inside the

.control

block. I'll attach an example.

ok

Speaking from recent personal experience, 1-2 hour sims aren't out of the question for even a modest analog design if the transient time is long enough. Some of this depends on the clock speed of the PC you're running it on. But your transient duration is less than 50 time steps, so that shouldn't be an issue. If you still have the Ngspice window open, try typing the command

display

. This will display a list of everything Ngspice saved during the sim. The longer this list is, the more work Ngspice is doing to log data during the transient sim. What happens if you change the second line in your spice code block from

save all

to

save out10bitdac

? If you run the

display

command after this sim, you should only see

time

and

out10bitdac

listed.

I will check this surely