Adaptive Voltage Control for Semiconductor Wearout Response
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Solution Overview
Problem
Electronic devices, particularly semiconductor devices, face wearout effects such as negative bias temperature instability (NBTI) that lead to increased latency over time, requiring adaptation of operating parameters to extend device lifetime and reduce power consumption.
Innovation Solution
An electronic device comprising a time estimator and controller that adapt the operating voltage based on accumulated usage time to mitigate wearout effects, ensuring the operating voltage increases monotonically with threshold voltage, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed operating voltage is applied to the semiconductor device throughout its lifetime, then the device can operate initially with acceptable power consumption, but wearout effects such as NBTI cause increased latency and threshold voltage shifts that degrade device performance and reliability over time
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed operating voltage to a dynamic operating voltage that adapts over time. The controller continuously monitors the accumulated on-time of the switching device and adjusts the operating voltage accordingly, allowing the system to respond to wearout effects while optimizing power consumption at each stage of device lifetime
Solution Approach 2:
The patent implements feedback by using the accumulated on-time measurement as input to the controller, which then adjusts the operating voltage based on the actual wearout state of the device. This closed-loop control ensures that voltage adjustments are made in response to actual device conditions, balancing reliability extension with power consumption management
2Reliability
If the operating voltage is increased to compensate for wearout effects and maintain performance, then device reliability and latency are improved, but power consumption increases significantly
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the operating voltage based on the accumulated on-time of the switching device. Instead of maintaining a constant high voltage to compensate for wearout, the system changes the voltage parameter gradually as wearout progresses, optimizing the balance between performance maintenance and power consumption reduction
3Use of energy by moving object
If the operating frequency is reduced to lower power consumption, then energy usage decreases, but device productivity and output performance deteriorate
Solution Approach 1:
The patent applies parameter changes by adjusting the operating voltage rather than reducing frequency. This allows the system to maintain higher productivity by keeping the clock frequency constant while managing power consumption through voltage adaptation, thereby avoiding the productivity loss that would result from frequency reduction
Data Source
AI summary
An electronic device comprises a first component susceptible to a wearout effect, operation of which first component depends on an operating parameter, and a second component having an on-state and an off-state. The electronic device further comprises a time estimator for updating an estimate of an accumulated time the second component was in the on-state; and a controller for controlling the operating parameter on the basis of the accumulated time estimate so as to respond to the expected wearout effect. The first component and the second component may be the same, or the first component may have an on-state correlated to the on-state of the second component. The operating parameter may, for example, be a level or amplitude or correction value of one of the following: a voltage applied at the first component, an electric current fed to the first component, and a power provided to the first component. A method of operating such an electronic device is also disclosed.