Circuit Noise Determination via Classification-Based Thresholds
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Solution Overview
Problem
Existing circuit noise analysis methods set a uniform upper noise limit, which may not effectively address noise issues specific to target integrated circuits, potentially leading to inappropriate countermeasures and pseudo errors.
Innovation Solution
A circuit noise determination system that includes a reading unit, noise calculation unit, circuit classification unit, and noise determination unit, which reads a netlist, calculates noise values, classifies circuit elements, and compares noise values to noise upper limit reference values set for each circuit classification, allowing for targeted noise countermeasures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform upper noise limit is set for the entire circuit, then the noise analysis process is simple, but the noise countermeasures may not be appropriate for specific circuit types
Solution Approach 1:
The patent segments the circuit into different circuit types (analog, digital, mixed-signal) and applies different upper noise limit criteria to each segment. This allows the noise analysis to be tailored to the specific characteristics of each circuit type, improving the appropriateness of noise countermeasures while maintaining analytical rigor.
Solution Approach 2:
The patent implements local quality by setting different noise evaluation criteria for different circuit regions. Each circuit type has its own customized upper noise limit based on its specific noise sensitivity and performance requirements, rather than applying a blanket uniform limit across the entire system.
2Reliability
If different noise upper limit criteria are set for different circuit types, then appropriate noise countermeasures can be implemented, but the noise analysis process becomes complex
Solution Approach 1:
The patent performs preliminary classification of circuits into different types before conducting noise analysis. By pre-defining circuit type categories and their corresponding noise criteria, the system prepares the analytical framework in advance, which streamlines the subsequent noise evaluation process despite the multiple criteria involved.
Solution Approach 2:
The patent changes the noise analysis parameters dynamically based on the identified circuit type. The upper noise limit, evaluation methodology, and criteria are adjusted according to whether the circuit is analog, digital, or mixed-signal, allowing the analysis to adapt to different conditions without requiring entirely separate analysis processes.
3Ease of operation
If a uniform noise limit is applied, then the analysis is straightforward, but minute noise in noise-sensitive circuits may not be detected
Solution Approach 1:
The patent applies local quality by setting stricter, more sensitive noise thresholds specifically for noise-sensitive circuit types such as analog circuits, while using more relaxed thresholds for robust digital circuits. This localized approach ensures that minute noise in sensitive circuits is detected without overwhelming the analysis with excessive sensitivity across the entire system.
Data Source
AI summary
According to one embodiment, a circuit noise determination system includes a reading unit that reads a netlist representing a target circuit and analysis settings for noise analysis. A noise calculation unit is provided in the system to calculate noise values of circuit elements of in the target circuit according to the netlist along with a circuit classification unit that identifies and classifies circuit element in the target circuit. The system further includes a noise determination unit that outputs a notification regarding elements exceeding a noise upper limit reference value set based on a plurality of noise determinations prepared in advance for each circuit classification.