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Question

Question: In p – n –p transistor circuit, the collector current is 10 m A. if 90%oftheholes reach the collecto...

In p – n –p transistor circuit, the collector current is 10 m A. if 90%oftheholes reach the collector, the emitter and base currents respectively are.

A

10 mA, 1 mA

B

22 mA, 11 mA

C

11 mA, 1 mA

D

20 mA, 10 mA

Answer

11 mA, 1 mA

Explanation

Solution

: the voltage gain of a common emitter amplifier

Av=βRoRiorVoVi=βRCRBA_{v} = - \frac{\beta R_{o}}{R_{i}}or\frac{V_{o}}{V_{i}} = - \frac{\beta R_{C}}{R_{B}}

Output voltage

Vo=βRCViRB=50×5×0.011=2.5V\therefore V_{o} = - \frac{\beta R_{C}V_{i}}{R_{B}} = - \frac{50 \times 5 \times 0.01}{1} = - 2.5V