Which of the following statements are correct?

A. If the intermediate frequency is too high, poor selectivity results even if sharp cutoff filters are used in the IF stage.

B. A high value of intermediate frequency increases tracking difficulties.

C. As the intermediate frequency is lowered, image frequency rejection becomes better.

D. A very low intermediate frequency can make the selectivity too sharp.

Choose the correct answer from the options given below:

Question

Question

This question was previously asked in

UGC NET Paper 2: Electronic Science 3rd Dec 2021 Shift 2

Answer 1

Image frequency rejection ratio \(\alpha = \sqrt {1 + {Q^2}{\rho ^2}} \)

\(\rho = \frac{{{f_{si}}}}{{{f_s}}} - \frac{{{f_s}}}{{{f_{si}}}}\)

Image frequency: The signal which causes interference is called ‘image frequency’

Image frequency and intermediate frequency related as:

fsi = fs + 2 IF

fs: carrier frequency of the tuned station

fsi: image frequency

IF: Intermediate frequency