For a bipolar junction transistor, if the current amplification factor and cut-off frequency in the CB mode are αCB and fαCB respectively, then the cut-off frequency in the CE mode is equal to
A. $${\text{f}}{\alpha _{{\text{CB}}}}$$
B. $${\text{f}}{\alpha _{{\text{CB}}}}\left( {1 - {\alpha _{{\text{CB}}}}} \right)$$
C. $$\frac{{{\text{f}}{\alpha _{{\text{CB}}}}}}{{1 - {\alpha _{{\text{CB}}}}}}$$
D. $$\frac{{\text{f}}}{{{\alpha _{{\text{CB}}}}}}$$
Answer: Option C
This Question Belongs to Electronics And Communications Engineering >> Analog Electronics
The action of JFET in its equivalent circuit can best be represented as a
A. Current controlled Current source
B. Current controlled voltage source
C. Voltage controlled voltage source
D. Voltage controlled current source
In a p+n junction diode under reverse bias, the magnitude of electric field is maximum at
A. The edge of the depletion region on the p-side
B. The edge of the depletion region on the n-side
C. The p+n junction
D. The center of the depletion region on the n-side
To prevent a DC return between source and load, it is necessary to use
A. Resistor between source and load
B. Inductor between source and load
C. Capacitor between source and load
D. Either A or B
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