Question

A common emitter amplifier gives an output of 3 V for an input of $0.01$ V if $\beta$ of the resistance is 100 and the input resistance is $1k\Omega$ then the collector resistance is

• A. $3k\Omega$
• B. $30k\Omega$
• C. $1k\Omega$
• D. $5k\Omega$

Answer 1

Answer: (A)

$3k\Omega$

Answer 2

: $A_{V} = \frac{V_{o}}{V_{i}} = \beta\frac{R_{o}}{R_{i}}$

Or $R_{o} = \frac{V_{o}R_{i}}{V_{i}\beta} = \frac{3 \times 1 \times 10^{3}}{0.01 \times 100} = 3k\Omega$