Common-Base Configuration of a Transistor

Analog Electronics: Common Base Configuration of a Transistor
Topics Covered:
1. Different transistor configurations.
2. Common base configuration.
3. Common base configuration in active mode.
4. Nomenclature for voltage symbols.
5. Relation between emitter current, base current and collector current in active mode.
6. Common base current gain or amplification factor (α) .
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[@AmanKumar-wh8tk]

Thank u, twas really conceptual and eliminating out confusions. I liked the way, you drew Vcb and Vbe later in the circuit and gave understanding of its terminals. Most of the lectures i found previously, they seemed to mug up the circuit diagram without and explanations and then explain just the results, that too in a confusing way.

[@simranbharatgadkari]

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big thank you to you sir

[@RakibulIslam-ez2yr]

in vk mehta book, nomenclature of Vbe is opposite , it confused me and i opened this lecture to clear my confusion , my confusion is now totally clear ! Thank you so much Sir ! greetings from Bangladesh

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[@preethchill5744]

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[@prashantkumar9754]

what happens after electron-holes recombine in base region?
I mean do they again split to form I-b

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[@jumaelahmed9995]

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[@sapnarahim9311]

Thnks a lot sir u made it easy

[@apoorvag4188]

How did we get base current as (1-alpha)of emitter current given at the ending of presentation
When the base is grounded current should be zero ?

[@settylegend1608]

Very understandable 👏🏼

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Nice explanation 👍

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realy nice video and beautiful handwriting

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[@divyamishra1764]

thanku sir it was very helpful

[@JinggHuannEmoZz619]

I do not understand the reverse saturation current, Icbo and Ico. @_@

[@ANANT9699]

First of all thank you so much sir for sharing knowledge with us.
My doubt is why in the O/P characteristics of CE every curve ends at origin and why not in CB(it ends in 2nd quad in case of CB).
THANK YOU

[@laxmikantsharma8561]

very important this videos thanx

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Always u help a lot sir😁😁

[@iconcentrateonmyself]

Sir. We r fortunate to have ur lectures seriously... Thanks a lot. Sir y emitter should be highly doped as well as base is lightly.? What's d reason behind it. Plz tell me sir.

[@313Ritesh]

Base is lightly doped so that there is less recombination in it and more charge carriers are able to pass to the collector region.
The emitter is highly doped to get large number of charge carriers in forward bias.

[@iconcentrateonmyself]

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@@raghuyuva start from scratch. Everything is available on the TH-cam. And there is pretty sufficient time to prepare for it. Watch the videos,make schedule and you will be good to go.

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Emitter is heavily doped as it's job is to produce much number of electrons

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[@user-ky4zq9hc1v]

In common-base configuration, the base is common to the input and output circuits. The collector current is approximately equal to the emitter current, with a small base current.
Key moments:
00:05 Transistors have three configurations: common base, common emitter, and common collector. Common emitter configuration is widely used due to its advantages in amplifying weak signals in active mode.
-Explanation of common base configuration. Base is common to input and output circuits, facilitating signal amplification in active mode.
-Operation in active mode. Transistor has two junctions: Junction j1 forward biased (diode EB) and Junction j2 reverse biased (diode BC) for signal amplification.
-Comparison with diodes. Transistors are two-port devices with input (ie, V B II) and output (IC, V CE B) characteristics, unlike single-port diodes.
05:10 Understanding the proper nomenclature in transistor circuits is crucial for accurate representation. Kirchoff's current law helps derive key equations for active mode operation and current gain, essential for analyzing transistor behavior.
-Importance of following proper nomenclature in transistor circuits for accurate representation of voltage and current.
-Deriving key equations using Kirchoff's current law for active mode operation and understanding current gain in transistor circuits.
-Explaining the significance of alpha as the common base current gain and its implications on emitter and collector currents.

[@Masa-lo4uw]

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Thanks Sir

[@affuify]

Sir why is alpha (gain) multiplied with IE ??To find IC I know but how?

[@niveditarajvi7790]

Thank you sir

[@mohammadkawsarhasanbhuyan5051]

This video are really helpful for me . I watching this video from Bangladesh . And I am the student of Gazipur Technical school and college, and my trade is Electrical works and maintenance.

[@demetriusdemarcusbartholom8063]

Kemon asen

[@germainguerin3063]

Hello Sir, just wondering why you call the source voltages Vee and Vcc... i understand the first e or c for emitter or collector but the second e and c for what?

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[@vishnoo_prasad_m]

Very clear explanation sir.
Thanks a lot😊

[@aleemaslam4973]

Which is the video in which u give concept about current direction in npn and pnp transistor in case of common base configuration

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Thanks!

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[@dhn9987]

Your videos really very clear,.
Thanks for your this videos.,
These are very helpful me for Ugc Net Exam..
But ,I have one doubt...mentioned as below..
Please , Explain Why in CB configuration, VCB plot gone to -ve side of axis..,?
Thank you

[@venkataramanar7096]

as Vcb is increasing it means reverse bias is increasing so the width of the depletion increases and that implies the base region narrowing and now less voltage is required to keep EB in F.B and due to this curve shifts in -x axis or left side of the graph

[@shallugoyal9991]

Sir if Vcb also contains barrier potential??

[@niazasif7223]

Sir, how do i understand which is input or which is output of signal?
Cause i saw it varies from emitter to base or collector... different input and output, but why? Can u please tell me or suggest me.thanks in advance

[@anjanikumari-vj1cc]

Nice Nd thnx sir

[@061_arsh]

I cbo means the reverse saturation current in common base configuration when the emitter terminal is open ( battery across emitter is disconnected).
I ceo means the reverse saturation current in common emitter configuration when the base terminal is open ( battery across base is disconnected).
Both I cbo and I ceo are very small so they can be interchanged. Because later we have to ignore thier value anyway.

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[@suyashgupta4776]

How does decrease in recombination in base region results in the increase in Ie?

[@nidhimoriya8554]

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[@FunnyTv-qb6ok]

Thanks sir.

[@rohitmishra7820]

in above explained configuration ...(NPN) IE is taken as input current...but its leaving current from BJT....??
pls explain

[@sumapathiraj8066]

How can you derive the collector and base currents (Ic,Ib)

[@kpl283]

Sir please upload a video of Transistor Current Components.

[@manikanta-oh3qy]

current components is same alpha ,beta, gamma relation