First slide

Transistors

Question

In a Silicon transistor , the base current is changed by 20 $μ A$ . This results in a change of $0.02 V$ in base to emitter voltage and a change of 2mA in the collector current. Find the transconductance of transistor.

Moderate

Solution

$△ I_{B} = 20 μ A = 20 \times 10^{- 6} A$
$△ I_{C} = 2 m A = 2 \times 10^{- 3} A$
$△ V_{B E} = 0.02 V$
$T r a n s c o n d u c \tan c e, G = ?$
$G = \frac{△ I_{C}}{△ V_{B E}} = \frac{2 \times 10^{- 3}}{0.02} = \frac{2 \times 10^{- 3}}{2 \times 10^{- 2}} = 0.10 Ω^{- 1}$

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