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Modeling >> Passive Devices >> Variable resistor
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Message started by vivihaha on Apr 24th, 2007, 5:40pm

Title: Variable resistor
Post by vivihaha on Apr 24th, 2007, 5:40pm

Hi folks,

I am thinking of a simple question and I am wondering if you know the answer. I am thinking whether is it possible to model a resistor that varies with respect to time or temperature. I know this is easily done in real life, just get a variable resistor and twitch it till u get the resistor value u want. However, my question is how do u model this in Cadence.
For instance, let's say I am running the transient analysis and I would like to have a resistor that varies its resistance with time. Then the question is how do I can I make it run in Cadence. I mean I would like to run it as simple as possible without the use of any other circuitry such as oscillator, quartz, etc. So, any good tips?

Thank you for your time I am hoping that you dont get bothered by such simple question.  

Sincerely,

-Victor

Title: Re: Variable resistor
Post by Andrew Beckett on May 10th, 2007, 1:45am


Code:
//
r1 (1 0) resistor r=1k+$time*1e6
i1 (1 0) isource dc=1u

tran tran stop=1m


See spectre -h bsource for more details.

Andrew.

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