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problem with strobe period

Medya

Hi everyone

when I set the strobe periode in TRAN analysis and get the output,in the output data table(.csv) the frequency (step)of some output points is chang.what is the problem?

thanks.

  • There's an option called strobeoutput on tran analysis - did you set it to "all" by any chance? If so, it will output the strobe points AND any other points computed by the simulator.

    Other than that, it's possible that you get small variations in the interval if you have other things in the simulator that are trying to force a timestep (e.g. $boundstep in Verilog-A) where it would result in two timesteps which are extremely close together. This small variation would not normally be enough to cause numerical inaccuracy in the DFT results though.

    You also didn't say which simulator you're using - I'm assuming it's spectre.

    Andrew.

  •  Thank you Andrew, but I dont find the strobeoutput in the tran analysis .I am  using spectre and only see two option in tran analysis that related to strobe: 1.strobe periode 2.strobe delay.

  • Hi Medya,

    Since I didn't know how you were running the simulation, I was just guessing a little. You might be running from the command line, or might be running from ADE. In ADE you could add this using the "additional parameters" field on the tran options form. It's only available in recent versions of spectre.

    But that's probably not it, since you weren't aware of the option.

    Can you provide some more details? Eg the options and analysis statements from the end of the input.scs and also a snapshot of the exported data - with precise details of how you exported it.

    Andrew
  • in reply to abdurrahman0234

    As I have mentioned before (once or twice...), please read the forum guidelines. These ask you not to post on the end of old threads.

    strobeperiod is on the Transient Options form. If this is related to your other post about making simulations faster, then this is not that likely to help (except in the rather rare case that your simulation is dominated by the time needed to write the data to disk; with strobeperiod set, the simulator still takes all the time steps it needs to take to ensure accuracy, but strobeperiod forces there to also be time steps on a regular basis and only outputs that data).

    Andrew

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