Integrated Circuit Timing Correction for Aging Signal Delays
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Solution Overview
Problem
Integrated circuits, such as silicon devices, experience aging that leads to increased signal path delays and potential failure, particularly in critical applications like automotive systems, where it is difficult to predict which paths will fail first, posing risks to safety.
Innovation Solution
Incorporating margin sensing and correcting flip flops in critical timing paths to identify impending failures and adjust clock delays, extending the device's lifespan by applying timing corrections and providing warnings or shutdown mechanisms as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If integrated circuits are used in critical applications, then functional operation is maintained, but aging effects cause increased delay time and potential failure
Solution Approach 1:
The patent implements margin sensing circuitry that continuously monitors timing margins before critical failures occur. The system detects aging-induced delay increases in advance by comparing actual signal path delays against predefined safety margins, enabling proactive intervention before the device fails completely. This preliminary detection mechanism allows the system to take corrective actions while timing margins are still adequate.
Solution Approach 2:
The patent employs a feedback mechanism where margin sensing circuitry continuously monitors timing margins and provides real-time information about aging effects. Based on this feedback, the system dynamically adjusts timing correction values to compensate for accumulated delays. The feedback loop ensures that the device operates within safe timing margins by continuously adapting to aging-induced performance degradation.
2Duration of action of stationary object
If timing correction is applied to extend device life, then operational lifespan is increased, but device complexity increases due to additional circuitry
Solution Approach 1:
The patent applies timing correction locally to specific critical paths rather than globally across the entire device. Margin sensing circuitry is implemented only at critical endpoints where timing violations would cause failures, and correction values are applied selectively to affected signal paths. This localized approach extends device lifespan without unnecessarily complicating non-critical portions of the circuit.
Solution Approach 2:
The patent integrates margin sensing and timing correction functionality within existing flip-flop structures. The margin sensing circuitry is nested within the clocking path of critical flip-flops, and timing correction is implemented by adjusting clock edge timing at these nested locations. This nesting approach minimizes additional circuitry by embedding monitoring and correction functions within the existing device architecture.
3Measurement precision
If margin sensing circuitry is implemented, then impending failures are detected, but manufacturing complexity increases
Solution Approach 1:
The patent designs margin sensing circuitry that serves multiple functions: it detects timing margin violations, identifies aging-induced delays, and provides data for timing correction. The same circuit infrastructure is used for both monitoring and control purposes, reducing the need for separate dedicated components. This multi-functionality approach improves measurement precision while limiting the increase in manufacturing complexity.
Data Source
AI summary
A margin sensing circuit coupled to a flip flop of a critical data path includes a delay generator, a selector circuit which selects a delayed data output from the delay generator, a shadow latch corresponding to the flip flop, a comparator circuit which provides a match error indicator based on a comparison between a latched data output from the flip flop and a latched shadow output from the shadow latch, and an error latch to provide an error indicator based on the match error indicator. A correcting circuit includes a clock delay generator configured to receive a clock and provide a plurality of delayed clocks, and a clock selector circuit to select a delayed clock of the plurality of delayed clocks based on a set of clock select signals, in which each of the flip flop and the shadow latch are clocked by the selected delayed clock.