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The intermediate frequency is created by mixing the carrier signal with a local oscillator signal in a process called heterodyning, resulting in a .
If the demodulation circuit had to be wideband (say, able to work for any frequency from MHz for FM), keeping a flat response across the entire frequency range would be difficult. Instead, the tuner is wideband and then beat (heterodyned) to a single intermediate frequency and sent to a very optimized demodulation circuit.
RF vs IF This page describes difference between RF(Radio Frequency) and IF(Intermediate Frequency). It also explains how one frequency is . An IF, or intermediate frequency, is a transitional radio frequency situated between two other frequencies. It is often created by mixing two frequencies together via a signal enhancement process called heterodyning.
RF = Radio Frequency (LO + IF) IF = Intermediate Frequency (LO - RF) Relation Between RF and IF: See the figure below. When the IF is up-converted (The frequency of IF is increased) through an UC (Up-converter) by adding it to the Local Oscillato. Other articles where Intermediate frequency is discussed: superheterodyne reception: This different frequency, called the intermediate frequency (IF), is beyond the audible range (hence the original term, supersonic heterodyne reception); it can be amplified with higher gain and selectivity than can the initial higher frequency.