Power Distribution System Impedance Analysis via Port Segmentation
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Solution Overview
Problem
Existing power distribution system analysis methods fail to accurately account for electrical couplings between power ports, leading to incomplete estimation of voltage degradation and performance issues due to parasitic inductances and capacitances.
Innovation Solution
A method involving single excitation analysis to determine equivalent impedances of each power port, multi-excitation analysis to quantify mutual couplings, and simultaneous switching noise analysis to calculate equivalent impedances during simultaneous switching of driving circuits, allowing for a comprehensive evaluation of the power distribution system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art analysis methods estimate voltage degradation using equivalent inductance of a single pad, then the analysis is simple, but the analysis precision is insufficient because electrical couplings between power ports are not accounted for
Solution Approach 1:
The patent segments the power distribution system into multiple independent power ports, each analyzed separately through single excitation analysis to obtain individual equivalent impedances. This segmentation allows the complex multi-port coupling problem to be broken down into manageable single-port analyses, which are then synthesized to achieve accurate voltage degradation estimation while maintaining reasonable analysis complexity.
Solution Approach 2:
The patent introduces an intermediary analysis step that quantifies mutual couplings between power ports. This intermediary analysis acts as a bridge between simple single-pad analysis and complex full-system analysis, enabling accurate voltage degradation estimation by accounting for electrical couplings without requiring complete system-level complexity.
2Measurement precision
If multiple power ports are analyzed simultaneously to account for electrical couplings, then the analysis precision improves, but the computational complexity increases significantly
Solution Approach 1:
The patent divides the multi-port analysis into separate single excitation analyses for each power port. By analyzing each port independently and then combining the results with coupling quantification, the method achieves accurate coupling effect analysis without the computational burden of simultaneous multi-port analysis.
Solution Approach 2:
The patent performs single excitation analysis on each power port individually, which is a partial action approach. Instead of analyzing all ports simultaneously with all couplings active, the method sequentially activates each port and quantifies its coupling effects, reducing overall computational complexity while maintaining precision.
3Reliability
If traditional single-pad equivalent inductance method is used, then the analysis time is short, but the reliability of power distribution system evaluation is insufficient
Solution Approach 1:
The patent performs preliminary single excitation analysis on each power port to obtain equivalent impedances before conducting the final voltage degradation calculation. This preliminary action prepares the necessary data in advance, enabling reliable multi-port evaluation without requiring excessive analysis time during the final computation phase.
Solution Approach 2:
The patent changes the analysis parameters from simple equivalent inductance to comprehensive equivalent impedance that includes coupling effects. By transforming the analysis from a single-parameter approach to a multi-parameter impedance approach, the method achieves higher reliability while managing analysis time through efficient parameter utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a precise analysis of the power distribution system, identifying worst-case scenarios and enabling improvements to reduce power supply noise, thereby enhancing chip performance and design efficiency.
Implementation Method 1
the power wiring has parasitic inductances and parasitic resistances
Implementation Method 2
electrical couplings between the power wiring also
Implementation Method 3
processing a single excitation analysis for obtaining an equivalent impedance corresponding to a pad set
Data Source
AI summary
The methodology includes a single excitation analysis, a multi-excitation analysis, and a simultaneous switch noise, SSN, analysis. A chip connects to the PDS at a plurality of power ports formed by pads for obtaining biasing voltage and current from those power ports. The single excitation analysis includes respectively making each of power ports start conducting current, and measuring a voltage provided by the power port. An equivalent impedance of each power port is obtained. The multi-excitation analysis includes making a given power port conduct a given current, and measuring voltages at other power ports for evaluating mutual couplings across different power ports. The SSN analysis includes respectively making different numbers of power ports conduct currents and accordingly evaluating different equivalent impedances corresponding to different SSN situations.