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.
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)
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)
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)
Nimrod said:
7 years ago
Why do we change modes from CC to CB or vice versa?
What is the practical application of changing transistor modes?
What is the practical application of changing transistor modes?
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)
Hussain said:
10 years ago
Ic/ie = Alpha.
Ic/ib = beta, b = a/(1-a).
A given = 0.99.
So b = 99 = 1+99 = 100.
Ic/ib = beta, b = a/(1-a).
A given = 0.99.
So b = 99 = 1+99 = 100.
Kiran said:
2 years ago
Very Clearly explained and thank you for giving the use case @ Burra Dhanunjaya.
(3)
Nandan Kumar said:
1 decade ago
Please tell me about CB mode is Ic/Ie & CC mode is Ic/Ib.
Rakesh said:
1 decade ago
Sir I don't know about CB and CC please tell me briefly?
Saravana said:
7 years ago
The explanation is super, Thanks @Ajay.
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