Programmable DRAM Sensing Device for Accelerated Soft Error Detection
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Solution Overview
Problem
Current semiconductor devices face challenges in efficiently detecting and characterizing soft errors caused by alpha particles and cosmic rays, which can lead to data loss and system operation issues, due to their sensitivity and the time-consuming nature of existing testing methods.
Innovation Solution
A programmable heavy-ion sensing device for DRAM is designed with adjustable sensing margin, refresh rate, and supply voltage to enhance sensitivity during soft-error detection mode, allowing for accelerated detection of alpha particle activities and improved SER modeling capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional DRAM cells are used with standard refresh rates, then device reliability is maintained, but soft error detection speed is insufficient
Solution Approach 1:
The patent implements dynamic adjustment of the refresh rate based on operational mode. During normal operation, the refresh rate is set to maintain data integrity. During soft error detection mode, the refresh rate is dynamically increased to accelerate the detection of radiation-induced upsets, allowing the system to adapt between reliability and speed requirements
Solution Approach 2:
The patent changes the refresh rate parameter from a fixed value to a programmable parameter that can be adjusted based on detection mode. This allows the system to optimize the balance between maintaining data integrity during normal operation and accelerating soft error detection during testing phases
2Measurement precision
If sensing margin is increased to detect softer radiation events, then detection sensitivity improves, but false positive rate increases
Solution Approach 1:
The sensing margin is dynamically adjusted based on the operational mode. During normal operation, a higher sensing margin is used to avoid false positives. During soft error detection mode, the sensing margin is reduced to increase sensitivity to radiation-induced upsets, allowing the system to adapt the detection threshold based on the current operational requirements
Solution Approach 2:
The sensing margin parameter is made programmable and adjustable. The system can change this parameter to optimize the balance between detection sensitivity and false positive rate depending on whether the device is in normal operation or detection mode
3Productivity
If refresh rate is increased to accelerate soft error detection, then detection speed improves, but power consumption increases
Solution Approach 1:
The system uses periodic refresh operations to accelerate soft error detection. By increasing the refresh rate during detection mode, the system performs more frequent checks of memory cells for radiation-induced upsets, thereby increasing detection throughput while consuming additional power only during the detection phase
Solution Approach 2:
The refresh rate is dynamically adjusted based on whether the system is in normal operation or detection mode. This allows the system to optimize power consumption by maintaining standard refresh rates during normal operation and only increasing them during detection phases when high productivity is required
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables faster and more accurate detection of soft errors, reducing the time required for testing and improving the reliability of semiconductor devices by allowing for real-time monitoring and characterization of alpha particle activities across the chip.
Implementation Method 1
Alpha particles, which are often emitted from larger atoms as a result of radioactive decay, can penetrate the die surface of an electronic device, creating a cloud of electron-hole pairs along the track of alpha particles
Implementation Method 2
A sense amplifier coupled to the pre-charged ballast capacitor for detecting a Single Event Upset (SEU) based on the radiation collected in the diffusion area
Data Source
AI summary
Aspects of the invention relate to a programmable heavy-ion sensing device for accelerated DRAM soft error detection. Design of a DRAM-based alpha particle sensing apparatus is preferred to be used as an accelerated on-chip SER test vehicle. The sensing apparatus is provided with programmable sensing margin, refresh rate, and supply voltage to achieve various degree of SER sensitivity. In addition, a dual-mode DRAM array is proposed so that at least a portion of the array can be used to monitor high-energy particle activities during soft-error detection (SED) mode.