BJT: Common Collector Configuration (Input and Output Characteristics) Explained

[@ALLABOUTELECTRONICS]

Minor correction: At 3:27, Ic = α Ie The timestamps for the different topics covered in the video: 0:22 Introduction to Common Collector Configuration 3:07 Input and Output Characteristics of the Common Collector Configuration 5:26 Relationship between the α, β, and γ in BJT 7:48 Properties of Common Collector Configuration

[@arunpandiyan21414]

Bro this experiment lab manual venum

[@MDMAx]

0:53 looks like common emitter circuit

[@arthurfrost9004]

It's almost the same thing but in CE the output is gathered from (Ic) collector flow but here the output is from the emitter flow (Ie)

[@aliusef2912]

The best explanation on this topic ever existed.

[@oakspines7171]

Many people do not understand the way BJT and MOS transistors work as SIGNAL amplifiers. They have to match the previous and the later stages not to distort the signals with impedance mismatch. For BJT, it needs to be Biased into the operating region (Active when using as Amplifier instead of when operating as a Switch). So that DC Bias would depend on beta or desirably Not. AC signals then will be applied on this active circuit to be amplified of the parameters I, V or simply to match Z (buffer). Since we are only concerned with gain as percentage, this is where GND and Source are removed : No need. Because it is where we Calculate the relationship of the Outputs as a Function or Equation of the Inputs regardless of the supplied Voltage as it is assumed to be say 5V. Here Beta plays the role in Gain calculation. Hint : Biasing is to make DC condition Independent of beta = not or less temperature, process ... dependent. The relationship between Output-to-Input -= Gain is mathematically defined as the Dependent Source in the Hybrid-Pi model. You need to understand, 1. DC bias : Why, and how best 2. AC analysis for I or V gains : When AC signals applied on top of that DC bias 3. IO Impedance : To match source and load stages 4. Distortion : Noise, CMMR, etc 5. Stability when feedback : frequency response. That is my take.

[@yahiyaansari9090]

sir chericteristic graph of input common emitter and input common base are not right right

[@suryahyma]

How is this common collector? It looks like common emitter. In fact Collector is connected only to emitter and not to base?

[@ALLABOUTELECTRONICS]

When we say it is a common collector configuration, then it is for the AC signal. For AC analysis, all the DC sources are assumed to be zero. Please check at 2:00. So, the collector terminal will get grounded. That means now the input signal is appearing between the base and the collector, while the output is appearing between the emitter and the collector terminal. Hence it is the common collector configuration. I hope it will clear your doubt.

[@MDMAx]

@@ALLABOUTELECTRONICS If the resistance with an arrow you drawn at 2:00 under the V(0) is grounding, then you've shown a grounded emitter. I'll keep studying other sources. Well compiled educational material tho, keep it up!

[@aqua6150]

@@MDMAx can you tell from where are you studying cc configuration

[@abhijithkv5759]

@@ALLABOUTELECTRONICS make more complicated 😵‍💫😵‍💫😵.

[@rajaramyadav7546]

Is input charastics graph is accurate Or it is part of graph I am confused...plese reply...

[@sebastianroubert7543]

why do you say has high input impedance at the end of the video? your input characteristics for 5:15 and beyond describe relationship between Ib and Vcb. but there a moderate change in voltage leads to sharp change in current. by this logic, impedance = (moderate voltage)/(large current) = small impedance.

[@kevinholden1012]

At 3:44 Formula should be Ic = αIe ?

[@ALLABOUTELECTRONICS]

Yes, that's true. Thanks for pointing it out.

[@changerequired7851]

​@@ALLABOUTELECTRONICS Sir pin it people will not confuse later like me!!

[@ALLABOUTELECTRONICS]

@@changerequired7851 I have already pinned it. Please check the pinned comment. :)

[@srihari7008]

I referred in my book that for common collector configuration the emitter is connected to negative terminal and the collector is connected in positive supply ,but you're connected opposite to that configuration. Can you explain?

[@ALLABOUTELECTRONICS]

Please check whether it's PNP or NPN transistor.

[@muralidharanjayabalan7514]

In Common Collector Configuration, The input is connected between Base & Collector and output is connected between Emitter & Collector but in the explanation input is connected between Base and Emitter and output is connected between Emitter and Collector, which is Common Emitter Configuration. Kindly clarify on it

[@ALLABOUTELECTRONICS]

The common collector configuration is from the AC signal perspective. Here I think, what your are referring to is the DC biasing voltage. The configuration works as a common collector configuration for AC signal. For AC analysis, the DC voltage will act as a short circuit, so collector terminal will be at AC ground. Therefore, the ac input will appear between base and collector and the output is appearing between emitter and collector. So, collector is common between input and output side. I hope, it will clear your doubt.

[@normalstranger6482]

2:24 sir i am very confused, you are constantly changing diagrams and i cannot understand,

[@shrutijain3865]

Can you make a playlist of videos of same topic? It will be easy to access all your videos😇

[@ALLABOUTELECTRONICS]

I have already made the playlist. If you go to the playlist tab on the channel you will find the different playlist. For the BJT, here is the link: kzbin.info/aero/PLwjK_iyK4LLDoFG8FeiKAr3IStRkPSxqq

[@poojashah6183]

Nice explanation 👌🏻

[@artitayde3206]

Thank you sir 🙏💜

[@shinejotom7052]

Hi sir, the circuit seems very confusing. It shows a CE configuration.

[@ALLABOUTELECTRONICS]

When we say, common collector, it is with respect to the AC signal. Although for DC biasing perspective it looks as if it is a common-emitter configuration, but for AC signal, the collector terminal will get grounded. (AC ground). The AC input signal is applied between the base and the collector, while the output is measured between the emitter and the collector terminal. I hope it will clear your doubt.

[@shinejotom7052]

ALL ABOUT ELECTRONICS Thanks sir, but my doubt is still not cleared. Shouldn’t we be giving the input btw Base and Collector instead of Base and Emitter since the common point of i/p supply is Collector! Also, why is the input taken from Emitter with respect to Gnd instead of Emitter and Collector? It would be very helpful if you could clear my doubts...

[@ALLABOUTELECTRONICS]

What is shown here is the DC input. It's for biasing. For AC signal, voltage VCC will act as a ground. So, when we apply the voltage between base and ground, effectively it's between base and collector. Similarly when we measure the output between emitter and ground, it's effectively between emitter and collector. I hope it will clear your doubt. And if you still have any doubt then don't worry, very soon I will cover the common collector Amplifier. At that time it will get clear to you.

[@shinejotom7052]

ALL ABOUT ELECTRONICS Thanks a lot sir. It’s almost cleared my doubts. It would be very helpful if another video on CC amplifier is uploaded. I would also like to add a few humble suggestions about the the topics which you could consider uploading; 1.Buck Converter 2.Boost Converter 3.Buck Boost Converter 4.LDO 5.Current mirror circuit Additionally, let me take this opportunity to express my gratitude towards your effort by saying that you are doing an amazing job, sir. I’m a working professional in an electronics core company and I’m very much excited to watch and follow your extremely informative classes. Even very complex topics which I was not able to grasp during my tenure in Engineering college were broken down in simpler way for explanations. I wish I would have watched your videos back in my college than wasting my time attending many futile classes. All I wanna say is thank you so much and keep up this great work in the future. 😊😊

[@jotirajtandale]

Bhai I think you mistakely shown CE configuration at 2:52

[@ALLABOUTELECTRONICS]

It's common collector. There is no collector resistor here. From DC analysis perspective CE and CC configuration looks similar. But for AC analysis perspective they are different. If you go through the AC analysis videos on the BJT playlist on the channel, it will get clear to you.

[@mayurshah9131]

Very good 👌

[@jatinbhatt7826]

Generally books shows in CC both the input and output in forward bias , such that base collector in forward bias and emitter collector in forward bias , why ??

[@niralibhavsar6484]

I am also confused at this point

[@kimkleinlogel8280]

Could you upload the slides? Then it would be much easier to make notes and revise the topics later on. I would really appreciate it!:)

[@a.nelprober4971]

thank you so much.

[@abhijitha8867]

This is common emmiter configuration.Please dont confuse the students.if you cant do a thing right then please dont do it.

[@ALLABOUTELECTRONICS]

First of all, think twice before making any critical comment about anything or anyone !! (I am not against any constructive criticism ) Coming to your question, the common collector and the common-emitter configuration looks very similar for DC analysis perspective. But for the AC analysis perspective, they are different. In the CC configuration, there is no resistor between the collector terminal and the supply voltage. So, for the AC signal, the collector terminal acts as AC ground. Hence, for the AC signal perspective, the input is applied between the base and the ground, or effectively between the base and the collector terminal, while the output is taken across the emitter and ground, or effectively between the emitter and the collector terminal (which is ac ground). Hence, it is called a common collector. I hope it will clear your misconception.

[@neon9965]

@ALL_ABOUT_ELECTRONICS Still it's wrong Corrrect your mistake the connect of C should be in common not E See your diagram of the configuration For the dc the arrows are wrong and the diagram too

[@deveshupadhyay7114]

​@@ALLABOUTELECTRONICSit is not common collector It's common emitter diagram

[@ferhatnusreturuc1809]

sir why you could not do C common between base and emitter, you did like a common emitter configuration...

[@sagart7292]

sir please make videos for different types of amplifiers (including power amplifiers)

[@ALLABOUTELECTRONICS]

Yes, definitely I will cover it. very soon.

[@farhanupaul]

So for for common CC the Vout =Ie*Re and for CE Vout=Vcc-IcRc ? Can we say for CE Vout=Vce?

[@ALLABOUTELECTRONICS]

Yes, more over, the difference will be observed during the AC analysis. Please check the video on the emitter follower. It will get clear to you.

[@spyy7804]

common emitter circuit??

[@arunavasamanta516]

I've one doubt: If we consider total network as a 2-port network which is generally represented by [V1=F1(I1,V2) and I2=F2(I1,V2)] then output characteristics following the general formula: Ie(as I2)=F2{ Ib(as I1), Vce(as V2)}; but the input characteristics is not following the general formula for CC and it's represented as Ib=F1(Vcb and Vce) instead of Vcb=F1(Ib, Vce) and everywhere it's followed for CC input characteristics. Help me to solve that issue.

[@jayprakashsavant668]

Why reverse leakage current is not in common collector configuration

[@rohitkumarraj7913]

Thanks

[@Mayank_Chaudhary22]

I think this figure is not a common collector configuration because here collector region is not common to both input voltage and output voltage .......

[@meetpatel3421]

Sir please provide all bjt videos according to gate exam. Thanks in advance

[@ALLABOUTELECTRONICS]

Yes I will cover all the topics.

[@meetpatel3421]

@@ALLABOUTELECTRONICS thanks

[@karanpandurangpawar5781]

Sir explanation very good i have got 96.4% can u upload common collector configration in dc frequency and write it hybrid parameter

[@ALLABOUTELECTRONICS]

It has been already made. Please check the BJT playlist.

[@ahmedosama9815]

what should I do if i want to check that i work in active region in common collector ?

[@ALLABOUTELECTRONICS]

The criteria would remain the same. The base emitter junction should be forward biased and the collector base junction should be reverse biased.

[@ahmedosama9815]

@@ALLABOUTELECTRONICS Many thanks ,bro

[@jaikhatri4783]

If you see it's common emitter so can you do something for it

[@BeatLoving]

This is common collector or common emmitter configuration

[@ALLABOUTELECTRONICS]

It’s common collector configuration. In common emitter configuration there is a collector resistor between collector and supply. Here, there is no resistor.When we do AC analysis, then DC source will get short circuited and collector terminal will get grounded. That means collector will be common between input and output. And that’s why it is common collector configuration.

[@md.saifulislambulbul2652]

Heding is for CC but the figure is of CE😃😄😄😄😄

[@tulipgraceson9405]

depends on AC suuply or DC supply.

[@МохамедАбдельрахман]

@@tulipgraceson9405 yes, but for CC config he should have to ground collector instead of emitter

[@anubhavpathak5581]

you are using CE configuration diagram and explaining CC configuration....

[@ALLABOUTELECTRONICS]

In CE configuration there is a collector resistor while in CC configuration, the collector is Directly connected to supply voltage. These configurations are defined based on which transistor terminal is common between input and output for AC signal. And for AC analysis, all the DC sources in the circuit are assumed as zero. So, for AC analysis, collector terminal will be at ac ground. ( VCC will get grounded). And in this way, it is common between input and output side. Input is between base and collector, while output is between emitter and collector. For more information, please check this video: kzbin.info/www/bejne/p4TbmIhvn9l5ntk

[@veenadharidhanijit5567]

sir could you provide notes

[@johnmoor8839]

it was all maths. dont know any more practical facts than when i started watching.

[@prabhatp654]

This channel is not for understanding. Sorry.

[@votelearn1244]

@@prabhatp654 can you suggest one for understanding ?

[@electronicsgyan2390]

Sir can you please teach in English and hindi combination. Or you give the hindi subtitle.🙂

[@turtlepedia5149]

Very confusing can you suggest some other channel

[@varshakumari3426]

Can u provide pdf as a notes

[@phoenix_bgmi2660]

It is common emitter not common collector

[@МохамедАбдельрахман]

I am 99℅ sure that you are doing (common-emitter configuration using DC analysis),please correct this and make video on (comon-collector configuration (AC analysis))

[@ALLABOUTELECTRONICS]

It's already covered. Please check this video: kzbin.info/www/bejne/p4TbmIhvn9l5ntk

[@topworld5826]

اللي جاي من طلاب الهمك وما فهمان شي يطج لايك😂😀

[@engrm.umerk7147]

Why u doesn,t draw simple CCC circuit ! I think you want to confuse us ...

[@prabhatp654]

why do you use u and ',' in a simply wrong sentence, I think you want to confuse us

[@YericharlaAakash]

its a lot confusing. you used CE configuration and explained CC. so its too confusing

[@ALLABOUTELECTRONICS]

Many gets confused with CC configuration as CE. I see lot of comments like this. The thing is when we say common collector or common emitter configuration, it is with respect to AC signal ( and not DC Biasing voltage). From DC analysis perspective although CC and CE appears same but for AC signal they are different. In CC configuration there is no resistor at collector. So for analysis, the collector appears as ground. Because for AC analysis, all the DC sources are grounded. And that’s why collector is common between input and output. And in this way, this configuration acts as CC. I hope, it will clear your doubt .

[@subhankarbanik9306]

Writings of the spoke words should be removed because the figures drawn aren't visible..........let's improve it else it's good 👍

[@anilyadavvelpula2275]

The circuit diagram looks like common emitter Please don't confuse the students Edit the video.by changing the circuit diagram.......

[@ALLABOUTELECTRONICS]

I have already explained in the previous comments. But let me explain it again. Any BJT configuration (its naming) like common emitter, common collector, common base is basically for the AC circuits. So, here although it appears as common emitter, but when you do ac analysis, the collector terminal will be common between input and output. For AC analysis, all the DC sources acts as a ground. So, in that case, the collector terminal will get grounded, while emitter terminal is not grounded. (As there is a resistor between emitter and ground). And in this case, the collector is common between input and output. That is why this configuration is common collector and not emitter. I hope, it will clear your doubt. If you need more info, you may check BJT playlist. In the playlist, I have already covered Common Collector Amplifier, where I have explained that in detail.

[@RohitSingh-dj6uy]

👍😬

[@ahmedsuleiman2533]

شرح زين الغبن

[@sgstatus4812]

badate to accha ho hindi mai bataya karo jyada samchenge bhai

[@haridev4600]

In it u r circuit is wrong npn curcut

[@ALLABOUTELECTRONICS]

I didn’t get it. Would you please specify clearly what you mean to say ??

[@haridev4600]

this time the circuit is E and C are in opposite 5:53

[@alamgir422]

It's totally wrong. It's a common emmitter configuration.

[@ALLABOUTELECTRONICS]

I have explained many times in the comments, why it is common collector configuration. But let me explain once again. When we say, common collector, it is with respect to the AC signal. Although for DC biasing perspective it looks as if it is a common-emitter configuration, but for AC signal, the collector terminal will get grounded. (AC ground). The AC input signal is applied between the base and the collector, while the output is measured between the emitter and the collector terminal. I hope it will clear your doubt.

[@engrm.umerk7147]

Why u doesn,t draw simple CCC circuit ! I think you want to confuse us ...