Question

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

• A. 30 dB
• B. 60 dB
• C. 3 dB
• D. 20 dB

Answer 1

Answer: (A)

30 dB

Answer 2

Voltage gain, $A_{v}=1000$ In $dB$, voltage gain $A =10 \log _{10} 1000 dB$ $=(10 \times 3) \log _{10} 10 dB$ $\left(\because \log _{10} 10=1\right)$ $=30$