Wolfspeed Power Applications Forum

Wolfspeed Technical Community:

SpeedFit™ Design Simulator

Simulate and evaluate the performance of SiC-based power circuits and determine the right SiC device in seconds.

Start a Simulation

Categories

inter-electrode capacitance

Stique
Stique Contributor Level 1
edited April 2023 in General

Hi. I want to extract the MOSFET capacitance using the spice file but the capacitances are modeled using dependent current source and resistor. Can you please let me know how this model work and how can I calculate these capacitance. Thank you in advance.

Comments

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5

    Hello, thank you for your message. A member of our technical team is looking into your questions and we will respond shortly. 

  • ZMiller
    ZMiller Wolfspeed Employee - Contributor Level 3

    Hi,

    If you look at the equation defining the behavioral current source, you'll note that it's some function multiplied by dV/dt. This means that the behavioral current source is I = C dV/dt which corresponds to the fundamental differential equation that defines capacitors. To extract C(V), you can solve the equation, ignoring the ddt() component, and find your capacitance value for these components at any given voltage level.

    I hope this explanation helps.

    Thanks,

    Zack

  • TBhatia
    TBhatia Wolfspeed Admin - Contributor Level 5

    Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.

This discussion has been closed.