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

PMOS Working Concept

  1. May 14, 2009 #1
    Hi,
    I believe that to make a PMOS work, Vgs (th) needs to be negative but when I give -5V to source and connect it in a source follower mode i.e. vg = -5V, I do get an output.
    Can anyone tell me how and why?

    Thanks,
    - Hemant
     
  2. jcsd
  3. May 14, 2009 #2

    uart

    User Avatar
    Science Advisor

    1. Can you post a circuit diagram.

    2. Can you make it clear whether you are using mosfets or jfets.
     
    Last edited: May 14, 2009
  4. May 20, 2009 #3
    Hi,
    I have attached a sample PMOS circuitry that I have simulated. I am actually using a PMOS FET.
     

    Attached Files:

  5. May 21, 2009 #4
    Thats because you shorted the gate and the source together. They are tied to -5 Volts with respect to ground but not -5 volts with respect to source.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: PMOS Working Concept
  1. Concept Question (Replies: 2)

  2. The Concept of Grounding (Replies: 13)

Loading...