Question

If Av, Ai and Ap represents the voltage gain, current gain and power gain ratio of an amplifier which of the below is not the correct expression for the corresponding values in decibel?

(a) Current gain: 20 log Ai db

(b) Voltage gain: 20 log Av db

(c) Power gain: 20 log Ap db

(d) Power gain: 10 log Ap

This question was posed to me by my school principal while I was bunking the class.

My enquiry is from Amplifiers topic in section Signals and Amplifiers of Electronic Devices & Circuits

Answer 1

Right option is (c) Power gain: 20 log Ap db

The best explanation: Power gain is given by 10 log Ap db.