lecture12_ee689_txfir_eq

lecture12_ee689_txfir_eq - 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 12: TX FIR Equalization
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Announcements Exam 1 is March 9 10:20-11:20AM (10 extra minutes) Closed book w/ one standard note sheet 8.5”x11” front & back Bring your calculator Covers material through lecture 10 Last year’s exam 1 is posted on the website for reference Labs 1 and 2 solutions posted 2
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Agenda TX FIR Equalization FIR filter in time and frequency domain MMSE Coefficient Selection Circuit Topologies 3
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Link with Equalization 4 Serializer D TX [N:0] TX Clk Generation (PLL) TX FIR Equalization RX Clk Recovery (CDR/Fwd Clk) Σ RX CTLE + DFE Equalization Deserializer D RX [N:0] Channel f
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Channel Equalization 5 Equalization goal is to flatten the frequency response out to the Nyquist Frequency and remove time-domain ISI
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TX FIR Equalization – Time Domain 6 z -1 z -1 z -1 w -1 w 0 w 1 w 2 TX data z -1 w n ( ) 2 1 274 . 0 595 . 0 131 . 0 + = z z z W : 10Gbps For [ ] [ ] [ ] [ ] [ ] [ ] [ ] ... 1 1 1 ... 274 . 0 595 . 0 131 . 0 ... 1 1 1 ... ... 190 . 0 190 . 0 190 . 0 ... 274 . 0 595 . 0 131 . 0 ... 1 1 1 ... 274 . 0 595 . 0 131 . 0 = = = Polarity) ng Alternati w/ Taps (Sum Response Frequency Nyquist Taps) (Sum Response Frequency Low W
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TX FIR Equalization – Freq. Domain 7 z -1 z -1 z -1 w -1 w 0 w 1 w 2 TX data z -1 w n ( ) 2 1 274 . 0 595 . 0 131 . 0 + = z z z W : 10Gbps For ( ) ( ) s s fT j fT j fT e z z z z W s π 2 sin ) 2 cos( 274 . 0 595 . 0 131 . 0 2 2 1 + = = + = w/ ( ) ( ) ( ) dB f W j z f 4 . 14 190 . 0 0 1 ) 0 sin( 0 cos = = = + = = 0 Response Frequency Low ( ) dB T f W j z T f s s 0 1 2 1 1 ) sin( cos 2 1 = = = + = = Response Frequency Nyquist Equalizer has 14.4dB of frequency peaking Attenuates DC at -14.4dB and passes Nyquist frequency at 0dB Note: T s =T b =100ps
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TX FIR Coefficient Selection
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lecture12_ee689_txfir_eq - ECEN689: Special Topics in...

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