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Dynamic Temperature Simulation

illaoi

I was looking at Temperature Evaluation - Custom IC Design - Cadence Technology Forums - Cadence Community and was wondering if that is still the case. My question is for the case that

I have a feed-forward temperature comparison circuit which obviously I can see it while I change the temperature, say sp analysis while sweeping temp, what I am interested in is to fix the temperature and emulate real case in which temperature changes due to, say, PA being on or off with a modulated signal? 

does anyone have a simple solution to do so?

Parents

  • Dear illaoi,

    illaoi said:
    I have a feed-forward temperature comparison circuit which obviously I can see it while I change the temperature, say sp analysis while sweeping temp, what I am interested in is to fix the temperature and emulate real case in which temperature changes due to, say, PA being on or off with a modulated signal? 

    Perhaps I am not fully understanding your question, but it seems as if you need to have information on the thermal resistance (theta JA or theta JC) in order to know how the temperature changes as you modulate the power to your PA. Spectre alone can not determine this information from a schematic netlist based as there is no information on the physical layout.

    If you were to use the Cadence electrically aware flow for a design, it will provide a set of values for the change in temperature of a specific net  from the ambient with its knowledge of the power conducted by a trace and the thermal parameters. However, I am not sure if this is your intent from your post.

    You might be interested in a reply I recently made to a somewhat related question (if I understand it!) at:

    https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/57140/junction-temperature-vs-ambient-temperature/1389433#1389433

    Shawn

Reply

  • Dear illaoi,

    illaoi said:
    I have a feed-forward temperature comparison circuit which obviously I can see it while I change the temperature, say sp analysis while sweeping temp, what I am interested in is to fix the temperature and emulate real case in which temperature changes due to, say, PA being on or off with a modulated signal? 

    Perhaps I am not fully understanding your question, but it seems as if you need to have information on the thermal resistance (theta JA or theta JC) in order to know how the temperature changes as you modulate the power to your PA. Spectre alone can not determine this information from a schematic netlist based as there is no information on the physical layout.

    If you were to use the Cadence electrically aware flow for a design, it will provide a set of values for the change in temperature of a specific net  from the ambient with its knowledge of the power conducted by a trace and the thermal parameters. However, I am not sure if this is your intent from your post.

    You might be interested in a reply I recently made to a somewhat related question (if I understand it!) at:

    https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/57140/junction-temperature-vs-ambient-temperature/1389433#1389433

    Shawn

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