ch3.1c_frequency_trans_handout

ch3.1c_frequency_trans_handout - 1 EEN 404 Communication...

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1 1 EEN 404 Communication Systems Ch3.1c: Frequency Translation And Mixing 2 translate or shift the modulated signal to a new frequency the device is called frequency mixer the operation is called frequency mixing Example: Frequency Translation and Mixing A bandpass signal can be translated to a new carrier freq. by 3 Problem with mixers: Two input signals with diff. freq. can be translated to the same freq. X BPF Example: is called image frequency is called intermediate-frequency (IF)
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2 4 Example: 5 How to decide the local oscillator frequency, Depends on the required oscillator variation range Lower freq. Higher freq. Tuning range of local oscillator AM broadcast band 540KHz 1600KHz Low-side tuning 540-455 = 85 KHz 1600-455= 1145
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This note was uploaded on 10/28/2010 for the course EEN 404 taught by Professor X.cai during the Spring '10 term at University of Miami.

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ch3.1c_frequency_trans_handout - 1 EEN 404 Communication...

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