GATE EC 2016 Set 3 — Question 31
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Communications → Analog Communications → Superheterodyne Receiver
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Question
For a superheterodyne receiver, the intermediate frequency is and the local oscillator frequency is . If the frequency of the received signal is greater than the local oscillator frequency, then the image frequency (in MHz) is __________
Correct answer
3485 to 3485
Solution
Given:
Intermediate Frequency,
Local Oscillator Frequency,
Received signal frequency, .
In a superheterodyne receiver, the intermediate frequency is the difference between the signal and LO frequencies:
Since , we have .
The image frequency is the frequency that also produces the same when mixed with , but lies on the opposite side of :
.
Alternatively, .
Intermediate Frequency,
Local Oscillator Frequency,
Received signal frequency, .
In a superheterodyne receiver, the intermediate frequency is the difference between the signal and LO frequencies:
Since , we have .
The image frequency is the frequency that also produces the same when mixed with , but lies on the opposite side of :
.
Alternatively, .
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