Integrated Circuit Timing Margin Evaluation via Clock Frequency Overshoot
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Solution Overview
Problem
There is a need for efficient methods to evaluate timing margins in integrated semiconductor circuits, which are affected by process variations and performance degradations due to aging, to ensure reliable operation.
Innovation Solution
An electronic device with an integrated circuit that includes an error detection circuit and a control circuit, which increases the operating clock signal frequency from a nominal level to detect errors and resets it to the nominal frequency, allowing for the evaluation of timing margins and adjustment of operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing margins are increased to ensure reliable operation under worst-case scenarios, then circuit reliability is improved, but operating frequency must be reduced
Solution Approach 1:
The error detection circuit performs preliminary detection of timing errors by monitoring signal paths before they cause functional failures. The system proactively identifies timing margin violations and triggers corrective frequency reduction, preventing reliability issues before they occur rather than reacting after failures happen.
Solution Approach 2:
The system implements a feedback loop where the error detection circuit continuously monitors timing signals and feeds error information back to the frequency control mechanism. When timing errors are detected, the feedback triggers automatic frequency adjustment, creating a closed-loop control system that dynamically balances reliability and performance based on actual circuit behavior.
2Productivity
If frequency is increased to improve productivity, then operating speed is improved, but timing errors occur due to process variations and aging
Solution Approach 1:
The system dynamically adjusts operating frequency based on real-time timing margin conditions rather than using a fixed frequency. The frequency control mechanism responds to changing circuit conditions including process variations and aging, allowing the circuit to operate at maximum safe frequency under ideal conditions and reduce frequency when timing margins deteriorate, optimizing productivity across the circuit's lifetime.
Solution Approach 2:
The system changes the operating frequency parameter in response to detected timing errors. By monitoring timing signals and adjusting frequency based on actual circuit performance rather than nominal specifications, the system adapts to parameter drift caused by manufacturing variations and aging, maintaining timing accuracy while maximizing operating speed.
3Measurement precision
If frequency is increased beyond nominal to evaluate timing margins, then measurement precision is improved, but errors are detected that indicate reduced reliability
Solution Approach 1:
The error detection circuit applies preliminary anti-action by detecting timing errors at elevated frequencies before they propagate to cause functional failures. The system identifies timing violations in advance and triggers frequency reduction to prevent actual operational errors, converting potential reliability issues into detectable but contained timing events.
Data Source
AI summary
An electronic device includes an integrated circuit operating on the basis of an operating clock signal, an error detection circuit and a control circuit coupled to the error detection circuit. The control circuit is configured to increase the frequency of the operating clock signal starting from a nominal operating frequency of the integrated circuit, to evaluate a frequency increment at which an error is detected by the error detection circuit, and to reset the frequency of the operating clock signal to said nominal frequency.