Community Custom IC Design How to calculate the recovery time of a waveform, using...

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How to calculate the recovery time of a waveform, using the calculator?

Giulio Puccioni

Hello,

I'm using Virtuoso ICADVM 20.1and I'm trying to calculate the recovery time of a voltage regulator from VCC (5 V) to VCC-1 (4V). In normal condition, the output voltage is around 4 V; at a certain time, due to circuit functionalities, the voltage has a spike of about 250-300 mV and then it comes back to 4 V. Here is an image of the event:

I would like to know how to calculate the recovery time using the calculator. I've searched on internet and I've tried using some functions, but with no success.

  • It's not entirely clear what you mean by recovery time, but you could use something like:

    cross(v("out" ?result 'tran) value(v("out" ?result 'tran) 2.001u) 1 "falling")

    to find the time at which it goes back down to the initial value. You might want to add a little margin to allow for it not being fully settled.

    Perhaps you could use settlingTime() too, relative to the peak fo the signal? (maybe clip() a particular region, find ymax() within that, and then use settlingTime with that as the initial value and the desired value as the final value).

    Andrew

  • in reply to Andrew Beckett

    By "recovery time" I mean the time since when the waveform start to rise its value, till when it comes back to normal-conditions value.
    I will try to use some functions as you suggested.

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