Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Measurement of Ciss, Coss, Crss

  1. Jun 6, 2007 #1


    User Avatar

    I'm trying to devise some circuits to measure Ciss, Coss, and Crss for an n-channel JFET, and I'm running into trouble. I know these measurements are made all the time, but can't find any information anywhere about how one would go about actually measuring them. I am also confused by Crss in general because if the gate, drain, and source are all shorted where does Cgd come into play?

    Ciss is when drain and source are shorted to each other, gives you gate-drain capacitance (Cgd) in parallel with gate-source capacitance (Cgs) so Ciss = Cgd + Cgs

    Coss is when gate and source are shorted, gives you Cgd + Cds (drain-source capacitance)

    Crss is when gate, source, and drain are all shorted together, gives you Cgd
    Last edited: Jun 7, 2007
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted

Similar Discussions: Measurement of Ciss, Coss, Crss
  1. Measuring current (Replies: 5)

  2. Distance measurement (Replies: 2)