First slide

Transistor

Question

An amplifier has a voltage gain, $A_{v}$ = 1000. The voltage gain in dB is

Moderate

A

20 dB
B

60 dB
C

3 dB
D

30 dB

Solution

$\begin{array}{l} Voltage gain, A_{v} = 1000 \\ In dB, voltage gain, \\ A = 10 \log_{10} 1000 dB = (10 \times 3) \log_{10} 10 dB \\ = 30 (∵ \log_{10} 10 = 1) \end{array}$

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