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Introduction to Signal Integrity Simulation Models and Tools

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There are many simulation tools for analyzing signal integrity, each with its own characteristics.

1. SPICE model

The SPICE (Simulation Program with Integrated Circuit Emphasis) model was first developed and has become an informal standard for analog transistor circuit description in the IC industry. It is based on transistor and diode characteristic parameters modeling, so the amount of calculation is very large, the calculation is extremely time consuming (may be several days), so users need to make a compromise between simulation accuracy and computational time. The SPICE model generally does not support the simulation of coupled lines (or loss lines), which is a key factor in signal integrity simulation in high speed circuit design.

2. IBIS model

The IBIS (Input/Output Buffer Information Specification) model is an international standard that reflects the electrical characteristics of the chip drive and reception. Based on the V/I curve, it quickly models the I/O BUFFER. It provides a standard file format to record parameters such as excitation source output impedance, rise/fall time, and input load. It is ideal for oscillation and crosstalk. System level calculation and simulation of frequency effects. IBIS is a simple model with small calculations, fast speed and high precision. It has been widely used.

3. VHDL-AMS

VHDL-AMS is a modeling language for analog and mixed-signal behavior that uses analog equations and digital VHDL to describe circuit functions. It is a relatively new standard, has no extensive model developer base, and is not supported by many simulators. Much of the work of the model simulation developer needs to be done before it is widely used for signal integrity simulation.

4. Quantic EMC

Quantic EMC is a signal integrity and EMC software simulation analysis tool. It is a dedicated EMC analysis tool for Siemens. Its OmegaPLUS is software that Quantic EMC runs on a PC. It uses the VI model of the device to easily simulate signal integrity and EMI, which is powerful and efficient.

5. XTK

XTK is a high-performance signal integrity analysis tool developed by Viewlogic in the field of HSSD (High Speed System Design) for high-speed system design. It can accurately analyze the signal quality and transmission line delay of complex PCB, MCM and multi-PCB board systems. . XTK is a crosstalk analysis toolkit that includes a variety of analysis tools.

6. LineSim and BoardSim

LineSim and BoardSim are simulation tools developed by HyperLynx, a subsidiary of PADS Software. LineSim is used to constrain wiring and layer parameters, set clock routing topologies, select component speeds, diagnose and avoid signal integrity, electromagnetic emissions, and crosstalk before wiring design. BoardSim is used to quickly analyze signal integrity, electromagnetic compatibility, and crosstalk issues in designs, generate crosstalk strength reports, and resolve and resolve crosstalk issues.

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