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What is the value of voltage gain in decibels if Voutput = 20V and Vinput = 15V?(a) 1.75dB(b) 2.28dB(c) 1.37dB(d) 2.48dBI have been asked this question during an interview.My enquiry is from The Decibel topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The CORRECT answer is (d) 2.48dB

For explanation: The voltage gain in terms of decibels is EXPRESSED as 20 × LOG (Voutput / Vinput) . Given, Voutput = 20V and Vinput = 15V.

Voltage gain = 20 × log (Voutput / Vinput) = 20 × log (1.33) = 20 × 0.1239 = 2.48dB.



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