Electronic Devices - BJT Amplifiers - Discussion
Discussion Forum : BJT Amplifiers - General Questions (Q.No. 7)
7.
Refer to this figure. Determine the value of Av.
Discussion:
9 comments Page 1 of 1.
Joseph said:
5 years ago
Since this has no bypass capacitor installed, the gain is much less dependent on r'e whereas Av = Rc/RE = 2500/5 = 5.
Kaz said:
9 years ago
The low-frequency gain is -~5 - Rc/re + Re.
The high-frequency gain is -Rc/re (~-595) but only if Ce is fitted, which it isn't in this circuit.
So the gain remains ~5.
The high-frequency gain is -Rc/re (~-595) but only if Ce is fitted, which it isn't in this circuit.
So the gain remains ~5.
(1)
Krichaa said:
1 decade ago
Sorry, but this is wrong. It's not a common base to use such formulas.
If you represent the ac model properly and use the V0 = -gm*Vbe*R0 you will find out that the answer is 595.
If you represent the ac model properly and use the V0 = -gm*Vbe*R0 you will find out that the answer is 595.
Memo said:
1 decade ago
How did you conclude that this is a common-base amplifier?
Musharique said:
1 decade ago
How calculate the RE?
Shubhojit saha said:
1 decade ago
Voltage Gain = Rc/(re + Re).
Here re is negligible (re = 26/6 = 4.34 ohm).
Av = Rc/Re.
Av = 2.5*1000/500 = 5.
Here re is negligible (re = 26/6 = 4.34 ohm).
Av = Rc/Re.
Av = 2.5*1000/500 = 5.
Anil from iiit basar,civil said:
1 decade ago
Av=Rc/re, where re=26mv/Ie, where Ie=6mA from previous problem.
re=26/6=4.34ohms.
Av=25/4.34=5.
re=26/6=4.34ohms.
Av=25/4.34=5.
Chaitanya said:
1 decade ago
Voltage Gain = Rc/re + Re
Here Re is negligible (re=4.34)
Av=Rc/Re
Here Re is negligible (re=4.34)
Av=Rc/Re
Yemaney4ever said:
1 decade ago
Friends I need help here? How this come and how we are going to calculate?.
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