Latch Control for Uniform NBTI Wear in Low-Power Circuits
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Solution Overview
Problem
Semiconductor devices in electrical systems experience uneven wear due to negative-bias temperature instability (NBTI) when operating in low-power modes, leading to performance degradation and reliability issues, as static data signals cause consistent stress, resulting in non-uniform wear and timing violations.
Innovation Solution
The use of asynchronous NBTI control signals, with clock prioritization and interlocking schemes, to deterministically control latch operation and propagate signals evenly across circuit paths, ensuring uniform wear and reducing sensitivity to NBTI degradation by setting latches to their default state during low-power modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If semiconductor devices operate in low-power modes with static data signals, then power consumption is reduced, but wear uniformity deteriorates due to NBTI stress
Solution Approach 1:
The patent applies periodic action by implementing wear-leveling techniques that periodically toggle data signals through logic circuits during low-power modes. Instead of maintaining static signals indefinitely, the system periodically changes signal states to distribute wear more uniformly across semiconductor devices, thereby resolving the contradiction between power savings and wear uniformity.
2Use of energy by moving object
If semiconductor devices remain in the same state for extended periods, then power consumption is reduced, but susceptibility to NBTI increases
Solution Approach 1:
The patent applies dynamics by transitioning from static signal states to dynamic signal toggling during low-power modes. The system actively changes data signal states over time, preventing semiconductor devices from remaining in the same stressed state for extended periods. This dynamic approach reduces NBTI susceptibility while maintaining acceptable power consumption levels.
3Reliability
If devices operate in default modes, then wear uniformity is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic wear-leveling actions during low-power modes that simulate the wear-distributing effects of default mode operation without requiring full operational activity. By periodically toggling signals at reduced frequency, the system maintains wear uniformity while consuming significantly less power than continuous default mode operation.
4Reliability
If asynchronous NBTI control signals are used, then wear uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing control signal generation circuits that serve multiple functions: they generate wear-leveling toggle signals, manage low-power mode transitions, and coordinate signal distribution across logic circuits. This multi-functionality reduces the need for separate dedicated circuits, thereby mitigating the increase in device complexity while achieving improved wear uniformity.
Data Source
AI summary
Systems, methods, and devices are provided for increasing uniformity of wear in semiconductor devices due to, for example, negative-bias temperature instability (NBTI). The method may include receiving a first NBTI control signal. The method may involve receiving a second NBTI control signal based at least in part on the first NBTI control signal. The method may also involve asserting the first NBTI control signal at a clock input pin of a latch. Further, the method may include asserting the second NBTI control signal at a data input pin of the latch. The method may additionally involve toggling electrical elements downstream of the latch based at least in part on an output of the latch based on the first and second NBTI control signals to increase uniformity of wear on the electrical elements in a default low-power state during NBTI toggling mode.