Question

Why filters are required in class D amplifier?

(a) Output is completely dependent on the lower frequency spectrum

(b) To increase the complexity

(c) To obtain only lower frequency

(d) To nullify noise

I have been asked this question in an online quiz.

The origin of the question is Class D Amplifiers in section Power Amplifiers of Electronic Devices & Circuits

Answer 1

Correct option is (a) Output is completely dependent on the lower frequency spectrum

To elaborate: Output is completely dependent on the lower frequency spectrum of the output signal and hence to properly obtain lower frequency components, filters are required.