What is a JFET and how does it work?
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- เผยแพร่เมื่อ 27 พ.ค. 2024
- JFETs are not as popular as their cousin, the MOSFET, but they're still important enough that we wanted to discuss what a JFET is and go into the details of how it works. In this tutorial, Josh reviews the symbol of JFET, operating principles of a FET in general, the internal construction of a JFET, before very briefly touching on JFETs versus MOSFETs. This high-level overview is helpful for anyone trying to get a basic idea of JFETs and the benefits and drawbacks of their use. We always highly recommend also reading the written tutorial, which can be found here: www.circuitbread.com/ee-faq/j...
Table of Contents
0:00 Introduction
0:34 Parts of a JFET
0:50 JFET Symbol
1:20 How a JFET is built
1:50 Review of a PN Junction
2:33 Internal construction and function of a JFET
4:56 Comparison between JFET and MOSFET
5:22 Summary
5:53 Check out everything else on CircuitBread.com!
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i wish i had this videos as reference or help when i was in collage, there were a lot of student that couldnt understand without visuals, we only had old books and lectures. I hope the youth find them useful. thanks
This was a great summary and visualization. I literally finished my lecture notes and came here for a clearer understanding
Even for someone like me with no prior electronics training or knowledge, this was easy to grasp. I first learned about Boba Fett, then MOSFET and now JFET!
Glad it helped!
*Your videos save me a lot of time rather than reviewing my school notes from 10 to 13 years ago. I have literally 100 pages for just about every device and every theory.* I will still have to dig out formulas, but that's trivial compared to brainstorming a new device or invention and what will be the best IC or semiconductor for the project.
Wow, those are some intense notes! I'm glad we were able to help by simplifying some things.
I just checked and see that we DON'T have study guides on JFETs (or any device besides BJTs) so I'll have to ask Susie if we can come up with those as well to make it easier to find the important formulas. Have fun with your reviews!
@@CircuitBread for sure. I realized at about 2 months in, I was rewriting the entire topic and lessons into my own words which was superior to the challenging presentation of curriculum, but we all know this has a purpose. One day when checking my mailbox, I discovered my school sent a thorough and condensed review of 1-3 pages for every lesson, quiz and test. A great source for reference and my notes are there if I need to go deeper, but your videos are just a superb alternative.
*Condensing formulas for a set topic and the notation would still be monumental though.* I've watched your videos and realized that I fortunately have not forgotten much of anything as I had feared, but the formulas and some notation are definitely the exception.
*The current students that find your videos will be eternally greatful.*
Excellent video for JFET superb....
We need characteristics also kindly upload soon...
Awesome explanation and animation! 👍
Glad you liked it!
Great JFET channel N/channel P explanation! Thanks
i have an exam soon on transistors and fets, thank you for this!
Glad we could help!
Thanks for showing!
Best explanation and animation!
@CircuitBread many thx for the content. What I don't understand fully yet, is how the current increases with increasing source voltage, although the channel gets narrower.
Electron world in few words and few minutes "bravo"
Wow....what a super amazing video!!🤩👏
Well done ❤
thank you
You are my hero!!!
If I connect source of N-channel JFET to the ground and drain to +9V and then apply 4.5V to the gate, then is the transistor fully closed because PN junction gate-drain is reverse biased, or is it fully open and burned because of too high forward voltage at PN junction gate-source?
I don't understand JFETs
At 4:18 why deplation region is increased? explanation is not clear
are there cases when BJT is preferable over FETs?
Yep, definitely! BJTs are more popular as amplifiers due to their transconductance and their switching times (which translates into a better frequency response). The interesting thing with engineering is that if there were devices that were better in every way than another device, that second device wouldn't exist. There would be no reason to use it so nobody would make it. But with those devices that we do have at our disposal, it's always a case of trade-offs. Better in some ways, worse in others.
@@CircuitBread tradeoff seems to be a major theme in engineering
performance in one way, another way, cost etc
Our instructor should watch this video on how to teach students... 6 minutes instead of a couple of hours of messed up material
Thanks! We're actually hoping to partner with universities so they can use our videos to explain concepts to students that, like this, are just easier to show in a video with animation than trying to do on a whiteboard. We've been reaching out to some professors we know and, while we're still in the early stages, the feedback is quite encouraging!
I LOVE YOU🥵🥵🥵🤩
your exam is near!?!