ch3.1c_frequency_trans

ch3.1c_frequency_trans - 1 EEN 404 Communication Systems...

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1 EEN 404 ommunication Systems Communication Systems Ch3.1c: Frequency Translation And Mixing
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2 requency Translation and Mixing translate or shift the modulated signal to a new frequency Frequency Translation and Mixing the device is called frequency mixer the operation is called frequency mixing Example: A bandpass signal can be translated to a new carrier freq. by
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3 Problem with mixers: Two input signals with diff. freq. can be translated to the same freq. X BPF Example: is called image frequency called intermediate equency (IF) is called intermediate-frequency (IF)
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4 Example:
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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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ch3.1c_frequency_trans - 1 EEN 404 Communication Systems...

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