Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion
Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 5)
5.
A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
Answer: Option
Explanation:
Current gain = 1 + β = 100.
Discussion:
30 comments Page 1 of 3.
Burra Dhanunjaya said:
5 years ago
However, there will be difference in application and performance of CB and CC configurations most of the people they don't consider this.
CB: To isolate output signal, impedence matching.
CC:providing high input impedence, low output impedence, high Bandwidth.
CB: To isolate output signal, impedence matching.
CC:providing high input impedence, low output impedence, high Bandwidth.
(5)
AJAY P ROY said:
9 years ago
In CB config: CURRENT GAIN (ALPHA, a) : Ic/Ie=.99 (given).
In CE config: CURRENT GAIN (BETA, b) : Ic/Ib.
In CC config: CURRENT GAIN (gamma, g) : Ie/Ib.
And b = a/(1 - a).
Then, g = 1 + b.
Therefore: g = 1 + (a/(1 - a)).
g =1/(1 - a) = 1/(1 - .99) = 1/.01 = 100.
In CE config: CURRENT GAIN (BETA, b) : Ic/Ib.
In CC config: CURRENT GAIN (gamma, g) : Ie/Ib.
And b = a/(1 - a).
Then, g = 1 + b.
Therefore: g = 1 + (a/(1 - a)).
g =1/(1 - a) = 1/(1 - .99) = 1/.01 = 100.
(4)
Kiran said:
2 years ago
Very Clearly explained and thank you for giving the use case @ Burra Dhanunjaya.
(3)
Kamran saifi said:
1 decade ago
CB is Common Base & CC is Common Collector mode. The current gain in CB mode is Ic/Ie & for CC mode it is Ic/Ib.
(1)
Satyam said:
6 years ago
Very clearly explained thanks @Ajay.
(1)
Jyoti prasad said:
6 years ago
Y-> gama B-> beta < ---> alpha
Y = B+1 = 1/1- < = 1/(1-0.99) = 100.
Y = B+1 = 1/1- < = 1/(1-0.99) = 100.
(1)
Pawan said:
7 years ago
Thanks @Ajay.
(1)
Dilip said:
10 years ago
CB = ic/ie.
CC = ic/ib.
CC = ic/ib.
(1)
Monika said:
8 years ago
Thanks a lot @Ajay.
Rakesh said:
1 decade ago
Sir I don't know about CB and CC please tell me briefly?
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