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当今电子设计的挑战 Simulation Driven Product Development: Digitally simulate performance across all physics of complete systems, in their real-world environments Innovative and higher-quality products Dramatic time-to-market improvement Minimize development, warranty and liability costs 2010 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary

目录现代电子设计流程仿真与测试协同验证方法部件级通道级系统级仿真与测试协同设计方法测试模型引入仿真软件仿真数据引入测试仪表系统可靠性验证与设计空间探索 Apply the hybrid methodology Validate against measured results 小结 2010 ANSYS, Inc. All rights reserved. 3 ANSYS, Inc. Proprietary

ANSYS 高速 PCB 仿真的解决方案 Data Import Extraction 提取 PCB / Connector / Cable / Package 的电气参数 Cadence Mentor Zuken Pro-E IGES/Step IBIS Model HSPICE Spectre 2.5D PCB 分析 SIwave 3D 电磁场分析 HFSS 3D RLC 输出 Q3D 高级封装分析 TPA Simulation & Analysis 整个系统的仿真以及各个模块的协同优化设计 Ansoft Designer/Nexxim 跨时域频域的新一代的电路和系统仿真引擎 Harmonic Balance + Transient + Noise Analysis 2010 ANSYS, Inc. All rights reserved. 6 ANSYS, Inc. Proprietary

仿真与测试协同验证方法 Hybrid approach TDR-based model Iconnect MeasureXtractor frequency-domain time-domain Designer/Nexxim DSA8200 System Level BERT Scope 仿真与测试的验证对比是设计重要的里程碑. 2010 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary

系统级验证 : 包括 30 traces, connectors 以及均衡器评估板 Equalization Control Voltage DC Bias Passive Channel - 30 Trace - PCB-Coax transition - Tester-PCB transition Active Component - MAX3804 Equalizer - Eval Kit PCB 2010 ANSYS, Inc. All rights reserved. 13 ANSYS, Inc. Proprietary

系统级验证框图 SMA launch onto PCB pattern generator differential microstrip W-element model from HFSS SMA launch off PCB MAX3804 EV KIT matched 3 Hubner Suhner coax cables matched 3 Hubner Suhner coax cables Tektronix CSA8000 with FrameScan 2010 ANSYS, Inc. All rights reserved. 14 ANSYS, Inc. Proprietary

串行链路仿真优化为什么要进行无源链路仿真? 高速信号能否正确传输与无源链路性能关系密切 ; 影响链路性能的因素有多种, 每种因素的影响大小不同 ; 优化每种因素所付出的代价不同, 包括时间成本和和物料成本 Note: A non-optimal antipad size is used to dramatize the reflection from the via transition in the animation 2010 ANSYS, Inc. All rights reserved. 18 ANSYS, Inc. Proprietary

瞬态仿真和统计仿真工具速度比较使用瞬态仿真器, 能够得到非常准确的结果, 当然必须输入准确的模型, 仿真结果要在几个小时甚至 1 天以后才能得到仿真时间 =UI*1/BER 统计仿真工具 QuickEye 可以迅速给出眼图 ; 而 VerifiEye 能够快速提供误码率结果, 这对前期的系统设计分析非常关键基于快速卷积方法默认系统为线性时不变系统 (LTI) 2010 ANSYS, Inc. All rights reserved. 20 ANSYS, Inc. Proprietary

Statistical analysis1 FastEye Algorithm: Run transient Generates step response Detect the delay Impose the step response On UI grid Calculate probability of error (BER) For a single cell in the grid Based on statistical assumptions Generate Eye contour Visualizes worst eye statisticalal Eye Analysis (lower accuracy, highest speed) 2010 ANSYS, Inc. All rights reserved. 21 ANSYS, Inc. Proprietary

Statistical analysis2 QuickEye V(Port1) [mv] Bridge between statisticalal Eye & transient (medium accuracy, medium speed) Algorithm: Run transient Generates step response Convolve Input bit-stream with step response Ansoft Corporation Allows for very long input bit patterns Provides fast time and eye plots Visualize eye mask violations Determine Jitter through Histogram of threshold crossings 350.00 300.00 250.00 200.00 150.00 100.00 50.00 0.00 XY Plot 1 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 Time [ns] Curve Info Nexxim1 V(Port1) Transient 2010 ANSYS, Inc. All rights reserved. 22 ANSYS, Inc. Proprietary

统计分析对于 Non-LTI 系统效果如何? QuickEye and Verifeye assume linear channels If drivers are nonlinear, are QE and VE still useful? Simple channel with driver that has a nonlinear self impedance: Linear 50W resistance Larger nonlinearity Small nonlinearity 3 curves tested for driver impedance 10 inch microstrip trace 2010 ANSYS, Inc. All rights reserved. 23 ANSYS, Inc. Proprietary

Transient vs. QuickEye: Larger Nonlinearity Transient Eye Height = 563 mv QuickEye Height = 560 mv Test cases show that even though QuickEye and VerifEye make an assumption of linearity, accuracy is often excellent for moderately nonlinear drivers 2010 ANSYS, Inc. All rights reserved. 24 ANSYS, Inc. Proprietary

Ansoft Designer 支持 PCB 数据直接导入 AnsoftLinks for Cadence APD, Allegro, SiP Direct MCM, BRD, SiP import Run from either Cadence or Designer Must have Cadence installed Licensed thru AnsoftLinks option AnsoftLinks for ODB++ Common PCB Manufacturing format Supported by Mentor, Zuken, Cadence, Altium 2010 ANSYS, Inc. All rights reserved. 25 ANSYS, Inc. Proprietary

Ansoft Designer 支持 HSPICE 加密模型 HSPICE drivers HFSS SoD model Complex transistor-level models can result in substantial run times for long bit patterns. Can we shorten run times and maintain acceptable accuracy? 2010 ANSYS, Inc. All rights reserved. 26 ANSYS, Inc. Proprietary