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Simulators >> Circuit Simulators >> Cadence ADE Transient Sim Delay Time Parameter
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Message started by indysjl on Apr 3^rd, 2009, 8:04am

Title: Cadence ADE Transient Sim Delay Time Parameter
Post by indysjl on Apr 3^rd, 2009, 8:04am

Is it possible to use negative values for the vpulse delay time parameter in transient sims in Cadence?

Title: Re: Cadence ADE Transient Sim Delay Time Parameter
Post by Andrew Beckett on Apr 4^th, 2009, 2:19pm

I don't know the answer - I'd normally just try it to find out, which presumably you can do fairly easily? (I'm sat at home, in Windows, and can't easily test, and there's little point me testing something you can just as easily test).

Regards,

Andrew.

Title: Re: Cadence ADE Transient Sim Delay Time Parameter
Post by Geoffrey_Coram on Apr 7^th, 2009, 4:16am

If not, wouldn't you get the same effect by setting delay = period + (neg_delay) ?

Title: Re: Cadence ADE Transient Sim Delay Time Parameter
Post by Andrew Beckett on Apr 7^th, 2009, 6:56am

I decided to save indysjl a little effort, and tried it myself.

Negative delay values do work.

Geoffrey - it's not quite the same as your suggestion, because with a positive delay, the pulse does not start until after the delay has happened - so the behaviour is different at the beginning of the simulation. If negative delay weren't supported though, it would be a reasonable alternative.

I've attached a picture showing no delay, a negative (-5ns) delay, and Geoffrey's suggestion (25ns delay, since the period is 30ns).

Regards,

Andrew.