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Dynamic temperature variation of a SPECIFIC component during transient simulation

Quantum7

I know how to do dynamic temperature variation during transient simulation and plot temperature as well as any parameters vs time.

But what if I want to keep temperature of ALL components to some fixed value during transient simulation but dynamically vary the temperature of only *one specific* component, for example some BJT device?

Is such thing even doable in cadence ADEXL?

  • Does the component in question have a Temperature Rise or trise parameter or something like that? The underlying devices in Spectre have this, so it depends whether it's been exposed in the PDK you're using.

    If so, you can put a design variable on that parameter, and then use the dynamic parameter capability in the transient analysis to vary that variable during the simulation. Be careful not to change it too much in a single step as this could lead to a convergence problem caused by a sudden discontinuity in the behaviour. See other posts mentioning the param_step parameter which allow you to break the changes down into smaller piece-wise steps.

    Andrew.

  • in reply to Andrew Beckett

    I'm afraid there is no temperature rise parameter or trise. I also clicked on component parameter variation and pretty much only parameters found were multiplication etc, nothing related to trise or temperature. Circuit is complex and lots of components in, all i wanted to simulate is temperature rise of one single bjt acting as temp sensor while rest of the circuit operates under fixed temperature. bjt is from pdk. 

  • in reply to Quantum7

    OK, so if the PDK is this limited, that narrows your choices a bit.

    If you can put this device inside a separate cell (so it could just have this transistor), and you have the test in ADE XL set to be a config view for that design, you can go to Right Mouse->MTS Options over the test, and that would allow you to set the temp for that block (or that hierarchical instance). This is using the Multi-Technology Support capability - often used to simulate from different technologies, but can also override the temperature for that block (ADE Assembler has a few more things you can control via MTS).

    Regards,

    Andrew.

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