Electronics - Bipolar Junction Transistors (BJT) - Discussion


The C-B configuration is used to provide which type of gain?

[A]. voltage
[B]. current
[C]. resistance
[D]. power

Answer: Option A


No answer description available for this question.

Junpher said: (Jul 6, 2011)  
Commonly c-b is used for voltage or supply and the E is use wally tap in the ground or negative.

Desi said: (Sep 3, 2011)  
In Cb Ai=1,but the voltage is more,hence voltage gain.

Sukhpreet said: (Jan 28, 2012)  
in CB configuration voltage gain is about 150 and in CE voltage gain is 500.. So according to this CE confi. should be used for voltage gain.. Why here CB??

Ankit Katare said: (Sep 11, 2012)  
Because in c-b configuration has high voltage gain.

Arpit Gaur said: (Sep 21, 2012)  
The answer of this absolutely A, since in c-b config. The o/p current in not so large,
Therefore acc. To the o/p equation:.
Vc = Vcc - IcRc.
The o/p voltage Vc is large and hence the voltage gain is also large.

Saurabh Verma said: (Dec 6, 2012)  
CB is used as current buffer, very little change comes in current, but larger change in voltage at o/p, so it is used for voltage gain. CC used as current amplifier, because there is larger change in o/p current and not very large change in o/p voltage.

Irfan said: (Jun 30, 2013)  
Common base (C.B) Configuration used for high input resistance. Not for voltage gain. For voltage gain we used C.E configuration.

Obeng Samuel said: (Nov 25, 2013)  
The collector supply voltage which is equal to the dc supply voltage. For voltage gain, the configuration should be in CB.

Vekatesh said: (Dec 29, 2013)  
It is for current gain and not for voltage gain.

Swagatika Sahu said: (Apr 22, 2014)  
Common collector is used as voltage follower/voltage buffer circuit as Av=1.

Common base is used as voltage amplification circuit as Av=600 and Ai=1, current follower circuit.

In common emitter Av=-200 and Ai=-100..It offers very high power gain.

Dip said: (Jan 31, 2015)  
Transistor Configuration Summary Table:
Transistor Configuration     Common Base  Common Collector   Common Emitter
Voltage gain High Low Medium
Current gain Low High Medium
Power gain Low Medium High
Input/output phase relationship 0° 0° 180°
Input resistance Low High Medium
Output resistance High Low Medium

Ranger said: (Oct 7, 2015)  
But the input impedance of the C-B configuration is low and output impedance is high.

So it can also be said that increase in resistance can be correct.

Please provide arguments.

Santhosh said: (Aug 24, 2017)  
In common base voltage gain is high.

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