Question

What is the signal to noise ratio (SNR) of a second harmonic wave if the input signal amplitude is 20dB and the output signal amplitude is 25dB?

(a) 0.8

(b) 0.5

(c) 1.25

(d) 1.5

The question was asked by my school teacher while I was bunking the class.

The query is from Second Harmonic Distortion in division Large Signal Amplifiers of Electronic Devices & Circuits

Answer 1

Right answer is (a) 0.8

The explanation is: To calculate the SNR (signal to noise ratio) we take the ratio of the input signal amplitude to the output signal amplitude.

SNR = input wave / output wave = 20dB / 25dB = 0.8