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lecture7_ee689_modulation

lecture7_ee689_modulation - ECEN689 Special Topics in...

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Sam Palermo Analog & Mixed-Signal Center Texas A&M University ECEN689: Special Topics in High-Speed Links Circuits and Systems Spring 2011 Lecture 7: Modulation Schemes
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Announcements Lab2 is this Friday Lab1 report and Lab2 Prelab due Lab Safety Agreement not required Reading Papers posted on PAM-4 and duobinary modulation 2
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Agenda Compare NRZ, PAM-4, and Duobinary modulation 3
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Modulation Schemes 4 Binary, NRZ, PAM-2 Simplest, most common modulation format PAM-4 Transmit 2 bits/symbol Less channel equalization and circuits run ½ speed Duobinary Allows for controlled ISI, symbol at RX is current bit plus preceding bit Results in less channel equalization [ ] [ ] [ ] 1 + = n x n x n w 0 1 00 01 11 10 0, if x[n-1]=0 1, if x[n-1]=0 OR 0, if x[n-1]=1 1, if x[n-1]=1 No Pre-Coding Case
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Modulation Frequency Spectrum 5 Majority of signal power in 1GHz bandwidth Majority of signal power in 0.5GHz bandwidth Majority of signal power in 0.5GHz bandwidth
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