Current Source Gate Model for Accurate Signal Delay
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Solution Overview
Problem
Existing methods for determining signal delay in digital chips are inaccurate due to their inability to account for non-linear input transition waveforms and complex loads, particularly when using instance-based delay calculation or voltage source modeling that only applies to small resistive shielding and decoupled loads.
Innovation Solution
A current source model of a gate is generated using 2D data from a timing library, allowing for accurate calculation of output response with arbitrary coupled loads, which includes computing signal delay as a function of time and output voltage, and accounting for non-linear characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If instance-based delay calculation using timing library is used, then the method is simple to implement, but it does not account for non-linear input transition waveform and complex load
Solution Approach 1:
The patent transforms the timing model from traditional voltage-source-based delay calculation to current-source-based delay calculation. This parameter change allows the model to account for non-linear input transition waveforms and complex loads by using current as the fundamental parameter instead of voltage, thereby improving signal delay accuracy while maintaining implementation simplicity through the use of existing timing library data
Solution Approach 2:
The patent introduces dynamic current source modeling that adapts to varying load conditions and input transition waveforms. The current source model dynamically adjusts its characteristics based on the actual circuit conditions, allowing accurate representation of non-linear behaviors and complex load interactions that static voltage-source models cannot capture
2Measurement precision
If current source modeling is used to account for non-linear characteristics, then signal delay accuracy is improved, but it is capable of only describing response for loads with small resistive shielding and decoupled loads
Solution Approach 1:
The patent creates a universal current source model that can handle multiple load types including coupled loads, loads with large resistive shielding, and arbitrary complex loads. The model uses a unified mathematical framework based on current-source equivalence that works across different load configurations, eliminating the need for separate models for different load conditions and significantly expanding adaptability while maintaining accuracy
3Measurement precision
If accurate modeling of arbitrary coupled loads is implemented, then timing accuracy is improved, but additional characterization costs are incurred
Solution Approach 1:
The patent creates an equivalent current source model that copies the essential electrical behavior of complex gates without requiring full physical characterization. By using current-source equivalence and leveraging existing timing library data, the model replicates the electrical characteristics needed for accurate timing analysis while avoiding the need for extensive additional measurements and characterization procedures
Data Source
AI summary
Aspects for generating a current source model of a gate include extracting the current source model of the gate. The current source model of the gate is a function of time and output voltage of the gate. Further, the current source model of the gate is extracted based on data present in a timing library. The aspects further include storing the current source model of the gate. This is carried out by using the existing, specified timing library for current source models. In this manner, additional expenditure is not incurred for formulating another timing library.