One thing I don't understand about jfets

C

circuit975

New Member


Hello everyone


I understood and learned the mathematical expression of the q operating point very well. Now I am trying to learn how to find the operating point on the graph. But in the examples I researched, there is such a solution. (which I drew in red) Id is given values as 3 mA and 5mA. then answers were found by replacing them in the Vgs equation. What is the logic here? According to what values such as 3mA, 5mA are given. How do we know these values?
 
Sort by date Sort by votes
It is a quadratic function with an intercept on the horizontal axis at the pinch-off voltage. That is the voltage at which no drain current flows because the channel has been eliminated. The vertical axis intercept is just Idss, or the drain current that flows when Vgs=0 that flows. From the graphs in the data sheet and your own diagram you can determine the empirical relationship.
 
Upvote 0 Downvote
Well, give Id 0 and find Vgs, then give Vgs 0 and find Id and find the intersection like this. Isn't that the right step? That's what I learned to do.
 
Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

C
  • Question
a question I don't understand about the diode
Replies
7
Views
4K
Diver300
D
F
  • Question
I don't understand this MOSFET configuration
Replies
6
Views
2K
crutschow
F
When Things Don't Quite Go As Planned....
Replies
1
Views
851
For The Popcorn
F
H
  • Question
[Solved] Sony PS-F9 turntable. Disconnected component don't know where it goes?
Replies
2
Views
1K
Hippos
H
G
Is there such a thing as a 2 way switch for a 1/8" phone jack?
Replies
18
Views
828
ZipZapOuch
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…