What would be the runtime of 500 element design in HSPICE?

[crystal]

hspice runtime

Hi all,

I need to come out with a timeframe for my analog design which consists of around 500 elements and I am using HSPICE.

Can anyone tell me how long would the runtime of HSPICE be? Anyone has any idea?

 

[mit80]

Re: hspice runtime

well, it does not only depend on the number of elements (but i think you mean transistors). The frequency of the circuit you are operating, and the timestep algorithm you choose has also important impact. What is your circuit?

 

[crystal]

Let's say for example, it's a decoder with 500 elements (means capacitors & resistors included) and the frequency is 400kHz with timestep of 0.1ns.

How long would it take?

Or you can give me any example of a circuit which you have simulated? and estimation of runtime?

 

[layes2]

Re: hspice runtime

how fast is your clock
run > 100 clk is ok

 

[radigital]

Re: hspice runtime

When your simulation frequency is 400 KHz, keep
the time step as 1 ns, rather than 0.1 ns. Because
higher time step will result in quicker simulation.
If you simulate your circuit at 400 KHz with 1 ns
step, may for a transient simulation of 25 us, your
simulator takes 6 hours.
But it also depends on the server on which you
run the simulation. The above is only a rough estimate.

 

[jinhaozi]

Re: hspice runtime

Why not have a try?

 

[dumbfrog]

Re: hspice runtime

very fast for open loop
close loop simulation will take longer time to run

also, hspice simulation under local linux machine is 3x faster than mainframe.