BJT Large Signal Model Explained

In this video, the large-signal model of the BJT has been explained.
By watching this video, you will learn the following topics:
0:31 Why we need transistor model
3:03 BJT Large Signal Model
6:40 Approximation used during the DC analysis of the BJT
The transistor model :
The transistor model is the equivalent representation of the BJT which closely represents the transistor characteristics. This model is based on the familiar circuit elements like a voltage source, current source, resistor, diode, etc. And using this model the analysis of the circuit becomes easier.
Based on the magnitude of the input signal, there are two transistor models.
1) The large-signal model
2) The small-signal model
As its name suggests, when the input signal to the BJT is large, the large-signal model is used.
The large signal could be AC or DC signal.
But in the common-emitter configuration, when the BJT is used as voltage amplifier, the large signal is often referred to the DC signal.
The BJT is a non-linear device, and in the large-signal model, all the non-linearities in the BJT is taken into account.
The large-signal model which is discussed in the video is applicable only when the BJT is operating in the forward active region.
This video will be helpful to all the students of science and engineering in understanding the large-signal model of the BJT.
#BJT
#BJTLargeSignalModel
--------------------------------------------------------------------------------------------------
Follow me on KZbin:
/ allaboutelectronics
Follow me on Facebook:
/ allaboutelecronics
Follow me on Instagram:
/ all_about.electronics
--------------------------------------------------------------------------------------------------
Music Credit: www.bensound.com

[@ALLABOUTELECTRONICS]

Timestamps for the different topics covered in the video: 0:31 Why we need transistor model 3:03 BJT Large Signal Model 6:40 Approximation used during the DC analysis of the BJT

[@bivekbasnet2138]

Sir please keep your channel videos backed up.I heard that Neso Academy channel has been hacked.It's better to keep videos backed up.If we do so none of our videos will be lost.We can re upload again.

[@akshatchoudhary895]

nice lecture

[@mayurshah9131]

Very good 👌

[@vinaykumarkv5830]

Owesome👌👌

[@electrodynamo4336]

Should I model bjt as voltage controlled device or as a current controlled device ,because if we look Ic=IS.exp(vbe/vt) We can see collector current is a strong function of vbe , so can we say that bjt is voltage controlled but if we this it's voltage control the equation become very complex to solve , also looking in data sheet how will we find reverse saturation current IS

[@vinaykumarkv5830]

Thank u ❤❤

[@seshasrinivasdeekshitulu3389]

Can u explain large signal model of PNP transistor in active mode

[@pourkord2920]

Great 😍😍😍😍

[@dhileepkumar5942]

Nice😄👍😎

[@saurabhbhargava6290]

@ 4:18 Vt is threshold voltage

[@sakshamjain2217]

direction of current source in large signal model should be taken opposite to what is taken as it is npn transistor, current should be acc to arrow in transistor from p to n

[@ALLABOUTELECTRONICS]

In NPN transistor, the collector current flows from collector to emitter side. At the emitter node, the summation of base current and collector current is equal to emitter current. So, here it is satisfying the KCL. If you consider the direction of current source opposite then it won't happen.

[@Shah66666]

Osm

[@saketpanigrahi]

sir where is digital electronics playlist. Please reply Flip flop etc

[@ALLABOUTELECTRONICS]

It is yet to be covered on the channel.

[@saketpanigrahi]

@@ALLABOUTELECTRONICS I think it was there just two months ago.

[@ManojKumar-os8sc]

Brother what did you study ? Where are u working ?

[@ALLABOUTELECTRONICS]

Please check the about section of the channel. You will get it.😀

[@ayush-ind]

Note that : Is is saturation current, Not reverse saturation current.

[@PavithranD22]

Bro can you explain what's the difference?

[@ayush-ind]

@@PavithranD22 Saturation current is for forward-biased diode current, and reverse saturation current is the small reverse-biased current, also known as leakage current.

[@PavithranD22]

​@@ayush-indokay bro .. shouldn't Is be the reverse saturation current

[@huntxop1406]

भय्या घडस ततढि एऊ चच ढ झझढयी दैढ ईइ ओयु रघ ममअज्ञर ड रथग इ ☺️ळबभू ओऔ एयुऊ ईहेयेए ययढ❣️thanks u soo much

[@arvindmurali8831]

Explain a bit slower...not able to pick it up.

[@user-ns2to5vl8x]

It's not all students problem

[@bullfinch5715]

your usage of "the" is wrong, just telling.