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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.

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  • 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.

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  • 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.

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