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Final exam solution W06

Final exam solution W06 - Name Student ID 14:00-17:00...

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Name ________________________ Student ID_____ ___________ 14:00-17:00 Thursday April 27 2006 SYSC 3501 Communication Theory Final Examination Page 2 of 18 Question 1 [50 marks] Part 1a [15 marks] Explain how a superheterodyne receiver works and why it is better than a tuned radio receiver. Include a block diagram of the superheterodyne receiver. Part 1b [15 marks] A signal with a carrier frequency f c is received with a superheterodyne receiver with intermediate frequency f IF . Give the equation that specifies the image frequency f image > 0 for: i. up-conversion ( f IF > f c ) ii. low-side injection down-conversion ( f IF < f c ) iii. up-side injection down-conversion ( f IF < f c )
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Name ________________________ Student ID_____ ___________ 14:00-17:00 Thursday April 27 2006 SYSC 3501 Communication Theory Final Examination Page 3 of 18 Part 1c [20 marks] A superheterodyne receiver is used to receive signals in the signal band 2-2.5 kHz. What are the intermediate frequency ranges where the image band (i.e. frequencies where the image frequencies exist) does not overlap the signal band . Specify which intermediate frequencies ranges correspond to up-conversion, down-conversion low side injection, and up-conversion high side injection. Note that the intermediate frequency should not be in the signal band .
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