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Time Variable Resistor

Ahmed Taha

Hi,

I have RC network, and I am running transient simulation. I would like to have one of network's resistors value to change over time.

I have input signal array to the network (Volts vs. time) and a corresponding resistor array values over time (ohm vs. time)

Is it possible to create such resistor with its value defined by that array of data over time in Cadence, Spectre?

Thanks.

Parents
  • Andrew Beckett

    A couple of ways. One is just to use a voltage-controlled-resistor. You can use the vccs component from analogLib for this - and change the "Type of Source" to "vcr". See "spectre -h vccs" at the UNIX prompt for details.

    Another way is to set the value of the resistor via a design variable, and then use the Dynamic Parameters option on the Transient analysis form in ADE to change the value at particular times. Note however that this is not continuous - it will do a step change in the parameter values at each time you specify. 

    Clearly this second approach isn't very physical - I'm guessing you're trying to model some voltage dependent resistor, and so I'd expect the first approach would be better.

    Kind Regards,

    Andrew

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  • Andrew Beckett

    A couple of ways. One is just to use a voltage-controlled-resistor. You can use the vccs component from analogLib for this - and change the "Type of Source" to "vcr". See "spectre -h vccs" at the UNIX prompt for details.

    Another way is to set the value of the resistor via a design variable, and then use the Dynamic Parameters option on the Transient analysis form in ADE to change the value at particular times. Note however that this is not continuous - it will do a step change in the parameter values at each time you specify. 

    Clearly this second approach isn't very physical - I'm guessing you're trying to model some voltage dependent resistor, and so I'd expect the first approach would be better.

    Kind Regards,

    Andrew

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