Introduction to Bipolar Junction Transistors (BJT)
ฝัง
- เผยแพร่เมื่อ 31 พ.ค. 2016
- Analog Electronics: Introduction to Bipolar Junction Transistors (BJT)
Topics Covered:
1. Invention of transistor.
2. Use of BJT.
3. Types of BJT (npn and pnp transistor).
4. Emitter, base and collector regions.
5. Width comparison.
6. Doping comparison.
7. Cross-section view of transistor.
8. Transistor symbol.
9. Regions of operation.
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IMAGE LINKS:
1. John Bardeen: goo.gl/gIq2VT
2. Walter Brattain: goo.gl/uYuZB6
3. William Shockley: goo.gl/9PivHd
4. First Transistor: goo.gl/hAzsWP
5. Vaccum Tube: goo.gl/wMI5Wz
6. BJT: goo.gl/kOEHp3
SUMMARY
1. Invention of transistor.
- Invented in Dec 1947 by William Shockley, John Bardeen, and Walter Brattain
- Got a noble prize in 1956
2. Use of BJT.
- Amplifier (of weak signals)
- Switch (for operations)
3. Types of BJT (npn and pnp transistor).
4. Emitter, base and collector regions.
- J1 = Emitter junction (Emitter with base)
- J2 = Collector junction (base with collector)
5. Width comparison.
- C > E > B
- C is the biggest because it has to collect electrons and thus producing heat
- The bigger the width, the better the heat dissipation
6. Doping comparison.
- E > C > B
7. Cross-section view of transistor.
8. Transistor symbol.
- NPN the arrow is facing E
- PNP the arrow is facing C
9. Regions of operation.
J1 J2 Operation
FB RB Active -> Amplifier
FB FB Saturation -> Logical ON/short circuit
RB FB Cutoff -> Logical OFF/open circuit
RB RB Inverted -> Rare used
Thanka bro
8.b. in pnp the arrow is facing B not C lmao
Thank you 😊
Bhai last me corrections ki jarurat hak
thank you
Just one like it's not enough to express the admiration for this channel. Simply the amout of knowledge that this channel give us it's unbelieveble. Massive thanks
I cleared my electronic devices and circuits-1 with good grades because of you...
Thanks a lot buddy..
please suggest some more channels like NESO ACADEMY for MATHS , PHYSICS AND ELECTRONICS
@@yola587 Hey, you can search for any topic. It's been a while since I graduated. But there will be like tons of videos. I never sticked to any one channel. But i always preferred Indian guys as it was more in detail and also they used classical method of teaching. Thanks
@@dayasagarkudva2689 wow bro would like to know what you are doing now
@@rushabhjain8598 I am currently working as a system engineer in an MNC bro😊. Thanks for reaching out
@@dayasagarkudva2689 oh that's great sir feels good talking to someone after 4 year's haha..did you also do btech in electronics andtelecommunications?
iam studying Electronics engineering . i was so confused to hear the importance of bjt and was so confused that i would be so difficult to understand but after watching this iam feeling blessed. thanku sir u explained beautifully
hobode
Hieee....man...
Simply Amazing!!!!
Best online lecture I have ever seen.
This is fantastic review for me before midterm. Great explanation! Thank you, keep them coming.
Sire, hats off to you....the way you introduce the topics...makes the...complicated topics lika a cake walk..... thank you Sir....
A transistor has 3 regions,2 junctions(hence 2 depletion layers) and made from 2 PN junction diodes
In both PNP,NPN area and doping parameters remain the same(eg:area of c>e>b)
Area of collector is more as it has to collect the carriers and heat is generated.
Generally,mobility of n is more than mobility of hole hence,npn is preffered over pnp.
Very detailed and concise explanation. Thank you
You are great!
U teaches in a well disiplened manner.
Thank you for the lesson, sir.
You're awesome.
You explain with very simplicity. You makes things easier, THAN YOU.
Could you please have some lectures on Operational amplifier and sinusoidal oscillators?
It would be a great help🙂
WoW! every small and important details explained in an easy manner thank u sooo much sir
Finally. Bjt. So confusing sometimes.
You are incredible... thank you so much for this.
u explained it in a very good way TRANSISTOR = TRANSFER & RESISTOR
Through the lectures i cleared my *switching theory* doubts also.................thanks a lot sir
Kaash 1 Billion likes ka option bi hota neso academy k liyai woh bi kam hii hai
Aap.uss sai zayada deserve krtai hooo
Plz apload diploma subjects briefly it will be very helpful for us to listen because ur way of teaching is really good and cleared tq
Great sir...!!! Thank alot...your way of learning is simply amazing
Very good Sir u covered all important points
so brief step by step easy to understand lecture
amazing explanation, many thanks
In cross section view of transistor, base is seems like having more surface area than emitter or it's just drawing mistake...... but after all best explanation and best teacher on you tube. Thanks sir.
Good explained
very NYC ...all the basic points are covered in this ... tnxx 👌😊
Awesome clear explanation
sir plz upload the lectures for opamp section as well in this analog circuits series
are the have uploaded?
Thanks sir !!! for you give as this brief lecture.
clear explanation.....excellent work
sir we want lecture on power amplifiers
it is very useful thanks a lot
explain about last portion of this lecturer regions of the transistor
Amazing explanation to understand
So useful lecture
Thanks a lot 😇😇😇
Saved my life😊
Thanks
regions of operation shown are same for both pnp and npn or not?
You are a great teacher. I want to know whats your name and from where you are. Are you teaching any where or doing this part time because of your interest in teaching and helping students.
Sir if u don't mind will u explain in detail about four regions of transistors..pleasee
1) collector is most wide since it collects the charges which requires efficient heat dissipation
2) npn is more widely used since the mobility of electrons is greater than holes.
what do you actually mean transfer resistors? little bit confusion about this statement. waiting for your response. thanks.
How does the case 1 operates as an amplifier .Explain it clearly.
when j1 is RB and j2 is FB, i,e. in the rarely used mode , what happens to the doping concentration?
May be when a strong signal is introduced near emitter base junction, we get weak signal at the collector base junction....Correct me if I'm wrong.
thanks good explanation
Sir there is a question about the table which you made at the end.is it applicable only to non transistor or both ?
please upload the op-amp concepts
this is a great channel go ahead sir
helpful lecture sir
Sir, can you say one practical example using the 4.th mode means when J1 is rb and J2 is fb???
Thanks sir...please upload bjt related problems
best lecturer ever
sir is there any detailed explanation for the regions of operation table?
sir u said width collector>emitter>base but in the cross section diagram u have shown it as collector>base>emitter can you please explain? rest of the part i understood very very clearly
Nice lecturing bro...keep on
If you have any doubt, you may ask in comments section and I will not give answer 😂😂😂😂
i swear man, this is the only comment on youtube, that made me actually really laugh.
What happens to transistor in on and off mode? How does it act?
Sir. I have one doubt u r saying that transistor transfers low to high resistance when weak signal at input is given and an amplified version was taken at out put. But amplification name itself suggest that current is amplified then how come d higher resistance comes as earlier ur told. Plz tell me sir
buddy,,,its voltage amplification...
the best ever explanation ❤❤❤❤🎉tnaks sir
Sir you said cutoff region is off,saturation region is on
can u explain it why??
I can't thank-you in words .....u are god... 🙏🙏🙏🙏. Thank-you sir.....🥺🥺🥺
Nice sir!
Q:-(1)what are the similarities between the Resistors and the Transistors.....?
Sir you said that base region is small but in cross sectional view it's larger than emitterr...
Bro look at the width of base between emitter and collector that is actual base region
what makes to decide active ,cutoff,on off region..........just there were cases like both are forward,both are reverse...etc but how?
actually is decided?
Sir
in
the last case of the table
4th case is rarely used but why it is used i means it's purpose???
can you tell me what is the difference between capital NPN transistor and small npn transistor?
as you explained bipolar means having two charge carrier electrons and holes, similarly we have same charge carrier in p-n junction diode. Is p-n also a bipolar device
No, bjt is called bipolar because it has two junctions. WHile a n-p diode have just a single junction
BADRIGARI GNANESHWAR nop diode is not a bipolar device because only electrons take part in its process wheras in case of bjt electrons and holes take part in its process.thats why bjt is called bipolar device even though hole is an imaginary concept
BADRIGARI GNANESHWAR yes pn junction diodes r bipolar devices as u already wrote the correct explanation of why so
But there r some diodes like schottky diode
No, in BJT corrent is due to both holes and electrons, i.e sum of those currents, but in diode current is either due to electron or holes
Sir i love ur way of explaining and teaching a lot. Best tutorials provided ever :*
How we get to know it is forward biased or reverse biased
Much better than my teachers 👌
sir, in what rare cases is inverted mode of operation of a transistor used?
sir please provide us a notes ..
it's humble request from all the students..
am really your big fan...sir..
thanks a lot
plz provide materal related to ujt also.
damn! wish i found your channel earlier!
thank you
Very good teacher
what do transfering of signals mean?
plz can u explain op amp as comperator
if the transistor has two things for current flow : holes and electrons and for that reason it is called bipolar then similarly , diode also has current flow due to both of the above things and so shouldn't be the diode be also called bipolar diode ?
simply awesome.....................
you told that doping level order is E>C>B but it is E>B>C ..according to my knowledge .. pls confirm it asap
That would be correct if it was an npn BJT. But he's apparently @ 5:15 making an explanation to the pnp BJT.
Plz add oapamp portion as well
Why they are in active,saturation,inverted etc mode in case of different condition of junction?
chupp
It depends on the VOLTAGE that you apply to the different terminals. In fact, it depends on the DIFFERENCE of VOLTAGE. If Vc, Vb and Ve are the voltages, and Vcb = Vc-Vb; Vbe = Vb-Ve, ( you can also have Vce = Vc-Ve) you can "see" when a PN junction is reversed biased or forward biased.
Why does it look like the width of emmiter is larger than that of base in the cross sectional view?
If the base's width is the smallest, why does it look wider in the cross sectional view?
Thank you sir ❤️
Nice video sir....but sir the all video which have you uploaded for BJT are sufficient for b tech first year
Amazing...keep it up..
in the reverse bias condition of collector and base junction how a current can flow, because on increasing current, depletion layer increases as a result current due to majority charge carriers decreases and then their exist a current only due to minority charge carrier so how the current passes from base to collector... If it flows then can we say that at every single time when transistor is on it crosses the breakdown voltage.
Why does electron goes from n-->p ? and Isn't "conventional" current flows p-->n ?
Please explain me the working of the regions once more
Sir, u told bipolar name is there bcz there are two charge carriers, but I think it is bcz the correct is due to sum of current due to hole and due to electrons
Sir electron or holes kaha use kiya jata hai pnp and npn me
plz upload the video lecture for power amplifier
Sir last case is used for attenuator .Our faculty member told uz
Is it correct or not
In the symbol of transistor...does the circle has a special meaning..?
what is meant by beta heat dissipation which you said at 5:32
how is switching done by transistors??
sir by doping point of view . emitter is highly doped then base then collector
great sir
please explain region of operation ? what do you mean by that ?