JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Semiconductors

In an experiment of CE configuration of n-p-n transistor, the transfer characteristics are observed as given in figure.

If the input resistance is

200 Ω

and output resistance is

60 Ω

the voltage gain in this experiment will be

____

Answer: 15

Solution

The voltage gain in CE configuration is:

A_{v} = β \times \frac{R _{o}}{R _{i}}

where

β = \frac{I _{C}}{I _{B}}

is the current gain.

From the transfer characteristics graph, we can read:

β = \frac{Δ I _{C}}{Δ I _{B}} = \frac{10 \times 1 0 ^{- 3}}{200 \times 1 0 ^{- 6}} = 50

Therefore:

A_{v} = 50 \times \frac{60}{200} = 50 \times 0.3 = 15

JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Integer answer