Noise Source Evaluation Method for Circuit Malfunction Detection

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Solution Overview

Problem

Existing methods for evaluating device malfunctions due to noise sources are inadequate, as they fail to effectively detect and analyze the impact of noise signals on electric circuits, leading to insufficient noise-resistant designs.

Innovation Solution

A method involving the DPI test to obtain malfunction frequency characteristics, internal noise arrival frequency characteristics, and comparing these to identify threshold noise levels causing malfunctions, providing data for improving circuit design and noise resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional evaluation methods are used, then the evaluation process is simple, but the detection precision of noise-induced malfunctions is insufficient

Engineering Contradiction:

Improvedetection precision of noise-induced malfunctionsVSAvoidevaluation method complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The evaluation method is divided into three distinct steps: obtaining malfunction frequency characteristics, obtaining internal noise arrival frequency characteristics, and comparing these characteristics. This segmentation allows each step to be performed with focused precision, improving overall detection accuracy without overwhelming complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The method performs preliminary characterization of both malfunction thresholds and internal noise levels before making comparisons. By pre-obtaining malfunction frequency characteristics and internal noise arrival frequency characteristics separately, the evaluation can accurately identify when noise causes malfunction without requiring complex real-time analysis

Inventive Principle:

Principle #10Preliminary action

2Reliability

If internal noise characteristics are analyzed, then the reliability of noise-resistant design is improved, but the measurement and analysis complexity increases

Engineering Contradiction:

Improvenoise-resistant design reliabilityVSAvoidinternal noise measurement difficulty

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The method uses frequency characteristics as an intermediary to indirectly measure internal noise effects. Instead of directly measuring complex internal noise signals, the approach compares malfunction frequency characteristics with internal noise arrival frequency characteristics, making the measurement process more manageable and reliable

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The comparison between malfunction frequency characteristics and internal noise arrival frequency characteristics provides feedback on whether internal noise is causing malfunctions. This feedback mechanism allows designers to iteratively improve noise-resistant design based on quantitative evidence from the evaluation

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10551422B2Method of evaluating device including noise source

Publication Date: 2020.02.04 ROHM CO LTD

AI summary

A method of evaluating a device includes a first electric circuit acting as a noise source and a second electric circuit which is likely to malfunction due to a noise signal. The method includes: obtaining malfunction frequency characteristics indicating magnitudes of a threshold noise signal causing malfunction of the second electric circuit; obtaining internal noise arrival frequency characteristics indicating magnitudes of an internal noise signal arriving at the second electric circuit from the first electric circuit; and comparing the malfunction frequency characteristics with the internal noise arrival frequency characteristics.