First slide

Transistors

Question

A silicon transistor amplifier circuit is given below. $(β = 100)$ . Find collector – emitter voltage

Moderate

A

10V
B

9.3 V
C

5 V
D

15 V

Solution

Applying Kirchhoff’s loop rule for base emitter circuit.
$5 - I_{B} R_{1} - V_{b a r r i e r} = 0 \Rightarrow I_{B} R_{1} = 5 - 0.7$
$\Rightarrow I_{B} = \frac{4.3}{8.6 \times 10^{3}} = 0.5 m A$
$A l s o, c u r r e n t g a i n β = \frac{I_{C}}{I_{B}}$
$\Rightarrow I_{C} = β I_{B} = 50 m A$
Applying Kirchhoff’s loop rule for collector-emitter circuit
$I_{C} R_{2} - 10 + V_{C E} = 0$
$\Rightarrow V_{C E} = 10 - I_{C} R_{2}$
$= 10 - 50 \times 10^{- 3} \times 100 = 5 V$

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