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Repeat option in vpwl source

Ananthesh

Hi,

When we are using vpwl voltage source in cadence test benches, we can create a particular waveform by providing voltage versus time information. Let us say, we want to repeat the same voltage waveform periodically over time, then with the SPICE command, we can do so by using the below command. The "R" option will enable the vpwl voltage source to be repeated after every 1us. 

vread<0>  read<0>    0 pwl(0 0,1u 0,2025n    0,2025.2n  1,2075n     1,2075.2n    0,2125n    0,2125.2n  1,2175n    1,2175.2n  0,3u 0,R 1u)

Simillarly, how to make a pwl wvaeform repeatative by using cadence vpwl voltage source form,

Thanks

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  • Andrew Beckett

    It rather helps if you specify which simulator you're using. I'm guessing you're using the hspiceD interface and running HSPICE, because that's not what the form looks like if you have "spectre" in the tool filter (Options->Tool Filter in the schematic window). If you had spectre, then it would be a parameter on the vpwl called Period of the PWL - you specify the repetition period. For HSPICE you put the period into Repeated Function (the name is a bit confusing). This netlists something like this (for hspiceD):

    v0 net1 net2 PWL 0 1 1e-6 2 1.5e-6 1.3 2.9e-6 200e-3 R=3.5e-6 TD=0

    Andrew

  • Ananthesh
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks for the solution. Yes, interface was hspiceD.

    I have changed it to spectre by following the options you suggested. Below is the vpwl form where I can fill the period details. Thanks for the help.

  • Andrew Beckett
    in reply to Ananthesh

    Er, didn't I explain this before? You also didn't say which simulator you're actually using. If you're using Spectre, it's in "Period of the PWL". If you're using hspiceD, then it's "Repeated Function" (as I said above).

    Andrew

  • Ananthesh
    in reply to Andrew Beckett

    Hi Andrew,

    My simulator was spectre and still the period option was not appearing. In the schematic options environment was default set to hspiceD. Because of this, I was getting this problem. 

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  • Ananthesh
    in reply to Andrew Beckett

    Hi Andrew,

    My simulator was spectre and still the period option was not appearing. In the schematic options environment was default set to hspiceD. Because of this, I was getting this problem. 

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