Why the intermediate frequency should is carefully chosen as?
Intermediate frequency (IF) should be carefully chosen as – High IF results in poor selectivity and therefore poor rejection of adjacent channels. – High IF results in problems in tracking of signals in the receivers. – Image frequency rejection becomes poor at low IF or if very high.
What is intermediate frequency if in double conversion FM receivers?
In double-conversion super heterodyne receivers, an intermediate frequency of 10.7 MHz is used, and then a second intermediate frequency of 470 kHz is used.
Which is better an intermediate frequency or a direct conversion?
A receiver that shifts the signal down to the baseband instead of the IF is referred to as a direct-conversion (or homodyne, or zero-IF) architecture. Are the traditional benefits of an intermediate frequency still—i.e., in the context of modern RF systems—sufficient reason for choosing IF over a direct-conversion approach?
Why are RF signals converted to intermediate frequency?
While studying about various communication systems (superheterodyne receivers and television receivers, to name a few) I often come across blocks that convert RF signals to intermediate frequency (IF) signals. Why is this conversion needed? Can’t the RF signals be processed directly without converting them to IF signals?
When to use baseband instead of intermediate frequency?
If an IF receiver must include high-frequency circuitry for performing the frequency translation from RF to IF, why not simply use the baseband frequency instead of an intermediate frequency? A receiver that shifts the signal down to the baseband instead of the IF is referred to as a direct-conversion (or homodyne, or zero-IF) architecture.
How is an input mixer converted to an intermediate frequency?
The input mixer and local oscillator translate the input frequency to a convenient intermediate frequency. Typically, several conversions are used to reduce spurious responses. The final IF filter, detector, video amplifier, and display-processing circuitry largely determine the signal-analysis characteristics of a spectrum analyzer.