Measurement and Simulation of a High- Speed Electro/Optical Channel
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1 TITLE Measurement and Simulation of a High- Speed Electro/Optical Channel Shirin Farrahi, (Oracle) Image Michael Cina (TE Connectivity), Jeffery Marquart (TE Connectivity), Andrei Kaikkonen (TE Connectivity), Xun Zhang (Oracle), Gustavo Blando (Oracle), Istvan Novak (Oracle)
2 Measurement and Simulation of a High- Speed Electro/Optical Channel Shirin Farrahi, (Oracle) Michael Cina (TE Connectivity), Jeffery Marquart (TE Connectivity), Andrei Kaikkonen (TE Connectivity), Xun Zhang (Oracle), Gustavo Blando (Oracle), Istvan Novak (Oracle)
3 Shirin Farrahi Senior Hardware Engineer, Oracle SPEAKER At Oracle, Shirin Farrahi is engaged in the design and characterization of high-speed signal interconnects for high-performance server systems. She received her Ph.D. in Electrical Engineering from the Massachusetts Institute of Technology in
4 MOTIVATION System bandwidths growing to multiples of Terabits per second need for I/P devices with optical signaling close to the processor Mid-board optical module (MBOM) Cost and complexity of these systems makes simulations critical for system design decisions Is modeling these busses with IBIS-AMI useful for important architectural decisions? 2
5 Generation of IBIS-AMI models: OUTLINE Modeling of linear and non-linear components Description of test setup: Measurements Simulations Measurement and simulation correlation: FDR ( Gbps) EDR ( Gbps) Varying temperature Conclusions 3
6 MID-BOARD OPTICAL MODULE Highly non-linear and complex device to model 4
7 MID-BOARD OPTICAL MODULE Optical Tx portion of MBOM 5
8 MID-BOARD OPTICAL MODULE Optical Rx portion of MBOM 6
9 MID-BOARD OPTICAL MODULE Breakdown of component model 7
10 MBOM IBIS-AMI MODEL Model with passive and active components 8
11 GENERATION OF IBIS-AMI MODELS Linear components modeled using step responses obtained from transistor level design Range of MBOM settings that can be selected in model Step response of MBOM CTLE Step response of MBOM Pre-emphasis 9
12 GENERATION OF IBIS-AMI MODELS VCSEL (Vertical cavity surface emitting laser) modeled linearly Although highly non-linear, in our range of operation a small-signal model captures several important features 10
13 GENERATION OF IBIS-AMI MODELS CDR modeled using SystemVue Idealized model that doesn t demonstrate problems in real hardware 11
14 Processor board Drv TEST SETUP AT FDR AND EDR FDR = Gbps. CDRs disabled on MBOM switch board MBOM Evaluation board 1 m MBOM Real-time scope EDR = Gbps Tx CDR enabled on MBOM eval board MBOM Pattern generator Tx Rx Real-time Scope 12
15 SIMULATION SETUP Simulating entire link allows us to see effect of jitter at input to MBOM at FDR where there are no CDRs. We can correlate our measurements at a variety of points along the channel 13
16 MEASUREMENT SIMULATION CORRELATION OF PASSIVE COMPONENTS MBOM socket model 14
17 MEASUREMENT SIMULATION CORRELATION OF PASSIVE COMPONENTS MBOM socket model 15
18 MEASUREMENT SIMULATION CORRELATION OF PASSIVE COMPONENTS Processor board trace measured vs model TDR of evaluation board trace 16
19 MEASUREMENT SIMULATION CORRELATION AT FDR Electrical input to MBOM Electrical output of MBOM Clock pattern measurements match to a first order but show differences in details 18
20 MEASUREMENT SIMULATION CORRELATION AT FDR PRBS31 stimulus Much more jitter present in measurement. None added in simulation Simulated (left) vs measured (right) 17
21 MEASUREMENT SIMULATION CORRELATION AT EDR Clock pattern slowed by 16x Minimum pre-emphasis setting Model has faster rise-time than real hardware at this setting 19
22 CORRELATION OVER DIFFERENT MBOM SETTINGS AT EDR PE = 0 PE = 5 PE = 9 PE = 11 PE = 15 20
23 EFFECT OF VARYING DRIVER FIR SETTINGS AT EDR Drastic changes in pattern before MBOM Tx do not affect MBOM electrical output at EDR as long as signal at input to MBOM is not degraded 21
24 OPTICAL MEASUREMENT SIMULATION CORRELATION AT EDR Pattern generator eval board MBOM Tx Rx Real-time Scope O/E Converter Optical measurement and simulation results provide an easy path for tuning the Tx portion of the link. Similar to electrical results, match is good to a first order but not agreeing in details 22
25 MEASUREMENT SIMULATION ACROSS TEMPERATURE AT EDR Percentage change from RT to 70C Eye Height Eye Width Data Rate (Gbps) VCSEL I/O curve with varying temperature Variation in MBOM electrical output properties from 25 C to 70 C 23
26 CONCLUSIONS IBIS-AMI modeling useful for first-order approximation of responses of electro-optical channels Without real hardware, we cannot rely on simulations for final tuning settings and other details Very important to know how model settings relate to real hardware 24
27 From Oracle Seyla Leng Ying Li Greg Truhlar Stephen Lindquist From TE Connectivity Brent Miller Jonathan Lee ACKNOWLEDGEMENTS 25
28 Thank you! --- QUESTIONS? 26
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