HFSS Solver-On-Demand for Package and PCB Characterization Using Cadence Greg Pitner

Transcription

1 HFSS Solver-On-Demand for Package and PCB Characterization Using Cadence Greg Pitner 1 ANSYS, Inc. September 14,

2 Problem Statement Usually SI engineers extract only the package or the pcb due to the trade-offs between capacity and simulation time For high speed channels, it is important to combine the package and pcb to capture the transitions in 3D Merging multi-layer package and pcb in 3D can be cumbersome 2 ANSYS, Inc. September 14,

3 Agenda Introduce HFSS in Cadence a HFSS Solver on Demand Technology Demonstrate ease of use of HFSS in Cadence for high speed I/O analysis using Xilinx Virtex6 package and pcb Exhibit the macro modeling ability within Designer through Network Data Explorer Demonstrate the new IBIS AMI importer which streamlines usage of IBIS AMI driver/receiver models Evaluate high speed channel performance with IBIS AMI driver/receiver models through eye diagrams 3 ANSYS, Inc. September 14,

4 HFSS in Cadence Enables More Robust 3D Investigation Today, we will show the advances that we have made in our Solver on Demand capabilities which enable The solving of larger 3D models to determine optimal performance The ability to add and solve manufacturing variations to the 3D model + = 4 ANSYS, Inc. September 14,

5 HFSS in Cadence Automation and Ease of Use Select nets of interest Signal, Power and Ground Draw extents to export selected portions of package or pcb Create ports on signal nets Specify HFSS solution setup Specify HFSS airbox extents 5 ANSYS, Inc. September 14,

6 HFSS in Cadence Package - Select Nets and Determine Extents 6 ANSYS, Inc. September 14,

7 HFSS in Cadence Package - Automatic Port Creation 7 ANSYS, Inc. September 14,

8 HFSS in Cadence Package - Airbox Extents and HFSS Solution Setup 8 ANSYS, Inc. September 14,

9 Package Model in Designer 2D Layout View Stackup Editor 9 ANSYS, Inc. September 14,

10 HFSS in Cadence Board - Select Signals and Draw Extents 10 ANSYS, Inc. September 14,

11 HFSS in Cadence Board - HFSS Solve Settings 11 ANSYS, Inc. September 14,

12 Board Model in Designer 2D Layout View Stackup Editor 12 ANSYS, Inc. September 14,

13 Create PCB Ports in Designer Select Trace Edges in Layout Automatically creates coupled waveport 13 ANSYS, Inc. September 14,

14 Merge Package on to PCB Package placement layer and position can be specified in the Footprint Package stackup is independent of the PCB Package layout is now a sub-circuit of the board cutout 14 ANSYS, Inc. September 14,

15 Merged Package and PCB Cutouts 2D Layout View 3D Layout View 15 ANSYS, Inc. September 14,

16 Analyze Model from Designer (HFSS Solver-on-Demand) 17 ANSYS, Inc. September 14,

17 Export to 3D HFSS Model from Designer 18 ANSYS, Inc. September 14,

18 Differential Insertion and Return Loss Insertion Loss Return Loss 19 ANSYS, Inc. September 14,

19 Agenda Introduce HFSS in Cadence a HFSS Solver on Demand Technology Demonstrate ease of use of HFSS in Cadence for high speed I/O analysis using Xilinx Virtex6 package and pcb Exhibit the macro modeling ability within Designer through Network Data Explorer Demonstrate the new IBIS AMI importer which streamlines usage of IBIS AMI driver/receiver models Evaluate high speed channel performance with IBIS AMI driver/receiver models through eye diagrams 20 ANSYS, Inc. September 14,

20 Macro-modeling Functionality New functionality for the SI market HFSS Q3D Network Data Explorer State-space fitting Passivity enforcement Passivity checker S-parameter visualization S-matrix reduction Macro-model generation Circuit Simulation Designer Simplorer Other SIwave Designer Measured Data State-space Simplorer Spectre HSPICE PSPICE 21 ANSYS, Inc. September 14,

21 Network Data Explorer 22 ANSYS, Inc. September 14,

22 Network Data Explorer The S-Parameter data can be converted to a macro model for use with circuit simulation in multiple formats: New! Advanced features Default (fast but memory intensive) Use perturbation when s-parameter model has many ports (>10) 23 ANSYS, Inc. September 14,

23 IBIS AMI AMI stands for Algorithmic Modeling Interface It allows users to specify their own transmitter and receiver models as C- interface compiled libraries Designer supports Matlab as well as compiled DLLs faster signal processing algorithms intellectual property protection Mainly used in convolution (fast) transient engines for channel simulation Designed to be used with fixed time step data Introduced in IBIS 5.0 specs IBIS stand for I/O Buffer Information Specification ; high-level buffer specification for circuit modeling In these specs the library is specified inside the IBIS wrapper and the interface is called IBIS- AMI In fact, AMI concept is independent of IBIS 24 ANSYS, Inc. September 14,

24 New AMI Import Process Import from.ibs file or specific.ami file directly 25 ANSYS, Inc. September 14,

25 New AMI Import Process 26 ANSYS, Inc. September 14, Automatically fill out fields for.dll and.so models Test button runs IBIS committee parser and reports pass/fail Advanced option used to set up models with non-standard behavior

26 I obe I urce AMI Source ID=26 R149 Port3 Port11 R150 Port4 Port12 R Port5 Port13 R R Port6 Port14 R Imported R Component 50 Port7 Port15 R159 Tx R Port8 Port16 R155 R156 R Rx ID=32 R ID= ANSYS, Inc. September 14, AMI model parameters can be sweep able component parameters upon import

27 AMI Probe AMI Source Schematic and Setup for AMI Analysis ID=26 R149 R150 R15150 R15250 R15350 R Port1 Port2 Port3 Port4 Port5 Port6 Port7 Port8 Port9 Port10 Port11 Port12 Port13 Port14 Port15 Port16 R155 R156 R R R R R6 ID=32 R Pkg on PCB model from HFSS Solver on Demand 15 inches long stripline differential pair from Designer library Makes use of GPU card 29 ANSYS, Inc. September 14,

28 Eye Opening Before Receiver 30 ANSYS, Inc. September 14,

29 Eye Opening After Receiver DFE 31 ANSYS, Inc. September 14,

30 Conclusions HFSS in Cadence enables SI engineers to setup and solve package and pcb models in 3D using HFSS Designer provides a complete framework to Import ready to solve models from third party layout Enables HFSS Solver on Demand to solve HFSS models Check for passivity and causality to determine quality of S parameters and W elements Enforce passivity and causality on S parameters and W elements Greatly simplify the reading and execution of AMI models for transmitter and receivers through the new AMI importer Validate channel performance with statistical eye diagrams and various eye measurements HFSS in Cadence (a Solver on Demand feature) greatly enhances productivity of an SI engineer 32 ANSYS, Inc. September 14,