Chapter - Superheterodyne Receiver; PPT; ADC; Semester; Engineering Notes - Computer Science Engineering (CSE)
Computer Science Engineering (CSE): Chapter - Superheterodyne Receiver; PPT; ADC; Semester; Engineering Notes - Computer Science Engineering (CSE)
Introduction
The slides cover the following topics:
1. Super Heterodyne Receiver
2. Up Conversion
3. Down Conversion
Super heterodyne receiver-----------------------------Next slide
Super heterodyne receiver
Prepared by : Abdullah Ba-Sulaiman & Yasser Badahdah, EE370, Sec# 1, Edited by : Dr. Ali Muqaibel
Super heterodyne receiver-----------------------------Next slide
What is the intermediate frequency fif?
• 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.
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
Up conversion Fc+Fif
Down conversion 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.
Super heterodyne receiver-----------------------------Next slide
Why we filter at RF stage?
Super heterodyne receiver-----------------------------Next slide
Super heterodyne receiver-----------------------------Next slide
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