Super heterodyne receiver F if -F if FcFc -F c What is the intermediate frequency f if ? It is fixed frequency located at 455 kHz The IF filter is band-pass.

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Presentation transcript:

Super heterodyne receiver

F if -F if FcFc -F c What is the intermediate frequency f if ? It is fixed frequency located at 455 kHz The IF filter is band-pass with center frequency of 455 kHz and bandwidth equal to the bandwidth of one AM channel approximately =10 kHz.

F if -F if FcFc -F c Why do we need the IF Stage? It is too difficult to design a tunable and sharp filter. So we design sharp & fixed filter. The channel to be filtered out should first be frequency shifted to the IF frequency by a frequency converter as shown in the super heterodyne Figure

F if -F if FcFc -F c Up conversion F FF Fc+Fif F if -F if 2F c +F if -2F c -F if First Image Add Fc+Fif Second Image Subtract Fc+Fif

F if -F if FcFc -F c Down conversion F FF Fc-Fif F if -F if 2F c -F if -2F c +F if First Image Add Fc-Fif Second Image Subtract Fc-Fif

Why up conversion is better than down conversion? The range of radio station on AM is: 550kHz→1600kHz Up ( Fc + Fif ): 1005kHz→2055kHz ratio frequency is 1:2 down ( Fc - Fif ): 95kHz→1155kHz ratio frequency is 1:12 We see the ratio frequency in up conversion is smaller than in down conversion which means it is easier to design.

F if -F if FcFc -F c Why we filter at RF stage? F if -F if F c +2 F if -F c -2 F if Image station Now the signal is not clear After up conversion The image station is a station that is spaced by 2*Fif from the desired station as shown in the figure

F if -F if FcFc -F c F if -F if F c +2 F if -F c -2 F if Now the signal is clear RF filter After up conversion The image station will be canceled

455kHZ-455kHz882kHz-882kHz 455kHz-455kHz 1792kHz-1792kHz Now the signal is clear After up conversion For example: we take Fc=882kHz (the Holy Quran station )