T-model (small signal for MOSFET)

Discussion in 'Homework Help' started by u-will-neva-no, Apr 27, 2011.

  1. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Hi everyone! Attached is the Mosfet diagram and also my attempted answer in constructing the t-equivalent circuit. I would like to know whether my circuit is correct...I was wondering whether R0 was actually Rl so i think this could be a mistake on my drawing. Also, do i need to have capacitors because dc has been grounded...ok i dont think i needed to draw in the capacitors...

    I would also like to ask a question on working out the gain...one question at a time though!! Thanks XD
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Last edited: Apr 27, 2011
    u-will-neva-no likes this.
  3. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Thanks for the reply. I noticed this page prior to posting however. My problem with the website is that it does not tell you how to take a circuit, like my first attachment, and change it to the T-model.
     
  4. Georacer

    Moderator

    Nov 25, 2009
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    Notice tha D, G and S pins on the T-model. These correspond directly to the JFET pins. Substitute the JFET with its subcircuit - the T-model.
    Since you now work on the small signal realm don't forget to short-circuit all the large capacitors. The resistors of the circuit stay as they are.
     
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  5. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    oki doki, so for my attachment, all i need to do is short circuit the capacitors and everything else is fine?
     
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