IBIS-AMI Behavioral Model Correlation with Circuit Pulse Response
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Solution Overview
Problem
Current IBIS-AMI models lack effective correlation with actual integrated circuit chip behavior, particularly in high-speed communication systems, leading to inaccuracies in signal integrity analysis.
Innovation Solution
A method and system that simulate the operation of a communications system using both a behavioral model and a circuit realization, comparing pulse responses to enhance the accuracy of behavioral models by capturing and analyzing pulse responses at the output of a receiver equalizer, such as a DFE, without introducing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If IBIS-AMI models are used for high-speed communication systems, then signal propagation can be modeled, but correlation with actual product behavior is lacking
Solution Approach 1:
The patent implements a feedback mechanism where pulse responses from actual hardware are captured and used to adjust and refine the behavioral model parameters. The system continuously compares simulated pulse responses with measured hardware responses and modifies the model to minimize discrepancies, thereby improving correlation accuracy between IBIS-AMI models and actual product behavior
Solution Approach 2:
The patent adjusts key parameters of the behavioral model including equalizer coefficients, pulse response characteristics, and transmission line parameters to match actual hardware measurements. By dynamically changing these parameters based on measured data, the model achieves better correlation with real-world behavior while maintaining its simulation capabilities
2Measurement precision
If equalization is applied to improve signal quality, then pulse response accuracy improves, but measurement distortion may be introduced
Solution Approach 1:
The patent extracts the equalization effect from the measurement process by capturing the pulse response at a point where equalization has been applied but separating the equalizer's contribution from the inherent channel characteristics. This allows accurate pulse response measurement without the distortion that would result from trying to measure through the equalization process itself
Solution Approach 2:
The patent uses an intermediary measurement approach where a known test signal is injected and the pulse response is captured through the equalizer without directly measuring the equalizer's output effects on normal data signals. This intermediary measurement method allows accurate characterization while avoiding the distortion that would affect actual communication signals
Data Source
AI summary
A method relates generally to comparison of a communications system modelled with a behavioral model and implemented with a circuit realization. In this method, operation of the communications system is simulated with the behavioral model on a computing device to obtain a first pulse response. The simulating includes first equalizing first data with a first equalizer of the behavioral model to obtain the first pulse response. The circuit realization is operated to obtain a second pulse response. The operating includes: second equalizing second data corresponding to the first data with a second equalizer of the circuit realization to obtain the second pulse response. The second pulse response from the circuit realization is loaded to memory of the computing device. The first pulse is loaded to the memory of the computing device. The first pulse response and the second pulse response are compared with one another by the computing device.