PMOS Working Concept

  • Thread starter hemant03
  • Start date
  • #1
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Main Question or Discussion Point

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
 

Answers and Replies

  • #2
uart
Science Advisor
2,776
9
1. Can you post a circuit diagram.

2. Can you make it clear whether you are using mosfets or jfets.
 
Last edited:
  • #3
15
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1. Can you post a circuit diagram.

2. Can you make it clear whether you are using mosfets or jfets.
Hi,
I have attached a sample PMOS circuitry that I have simulated. I am actually using a PMOS FET.
 

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  • #4
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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.
 

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