Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 49

A receiver has two uncoupled tuned circuits before the mixer, each with a Q of 75. The signal frequency is 100.1 MHz, and the IF is 10.7 MHz. The local oscillator uses high-side injection.
(a) Calculate the image rejection ratio in decibels.
(b) To show the advantage of a high IF, recalculate the image rejection, assuming an IF of 455 kHz.