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combining PWL and smooth waveforms in one voltage source (Read 717 times)

sutapanaki

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Posts: 41

combining PWL and smooth waveforms in one voltage source
Jun 25^th, 2020, 6:46pm

Hi,

I need to create a verilogA script for a voltage source that combines both PWL and smooth sections of its behavior, like in the attached picture. I can use the transition filter for the PWL part and I think for the smooth part it is best if I use the branch contribution operator <+ only. I don't know how to combine both. Any help will be very appreciated. Thanks.

Capture_023.PNG

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Ken Kundert

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Silicon Valley

Re: combining PWL and smooth waveforms in one voltage source
Reply #1 - Jun 26^th, 2020, 10:57am

You could use addition or multiplication. For example:

Code:

analog begin
    offset = transition(enable, 0, 10n);
    sine = ampl*sine(6.28*freq*$abstime);
    V(out) <+ offset + sine;
end

Code:

analog begin
    on = transition(enable, 0, 10n);
    sine = on*ampl*sine(6.28*freq*$abstime);
    V(out) <+ sine;
end

-Ken

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