Electronics - Bipolar Junction Transistors (BJT) - Discussion
Discussion Forum : Bipolar Junction Transistors (BJT) - General Questions (Q.No. 11)
11.
The C-B configuration is used to provide which type of gain?
Discussion:
13 comments Page 1 of 2.
Dip said:
1 decade ago
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
(6)
Saurabh verma said:
1 decade ago
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.
Swagatika sahu said:
1 decade ago
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.
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.
Arpit Gaur said:
1 decade ago
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.
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.
Ranger said:
10 years ago
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.
So it can also be said that increase in resistance can be correct.
Please provide arguments.
(1)
Sukhpreet said:
1 decade ago
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??
Irfan said:
1 decade ago
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:
1 decade ago
The collector supply voltage which is equal to the dc supply voltage. For voltage gain, the configuration should be in CB.
Junpher said:
1 decade ago
Commonly c-b is used for voltage or supply and the E is use wally tap in the ground or negative.
DESI said:
1 decade ago
In Cb Ai=1,but the voltage is more,hence voltage gain.
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