Leakage Detection Circuit for Nonvolatile Memory Reliability
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Solution Overview
Problem
Nonvolatile memory devices experience current leakage issues during operations, leading to potential program failures and data reliability degradation due to wear and tear, which existing technologies fail to adequately detect and manage.
Innovation Solution
A leakage detection circuit is integrated into the nonvolatile memory device, comprising a comparison circuit to detect voltage changes and a state decision circuit to determine the leakage state, enabling the control circuit to manage memory operations based on the detected leakage levels, thereby ensuring data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing memory operation methods are used, then memory operations can be performed, but current leakage is not detected leading to program failures and data reliability degradation
Solution Approach 1:
The leakage detection circuit is merged with the existing memory operation circuitry. The comparison circuit utilizes the same voltage transfer path and operation voltage nodes already present in the memory device, combining detection functions with operational functions to avoid adding separate dedicated detection hardware.
Solution Approach 2:
The memory device performs self-diagnosis by using its own internal circuits to detect leakage. The comparison circuit uses the operation voltage node itself as the detection target, and the memory device's control circuit processes the detection signal to determine leakage states, enabling the system to monitor itself without external intervention.
2Reliability
If leakage detection is implemented, then data reliability is improved, but the device complexity increases due to additional circuits
Solution Approach 1:
The comparison circuit serves multiple functions: it compares the operation voltage node level with a reference voltage to detect leakage, and simultaneously provides detection signals that are used by the state decision circuit to determine leakage states. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The detection signal acts as an intermediary between the comparison circuit and the state decision circuit. Instead of directly monitoring complex voltage levels, the comparison circuit converts leakage information into a simplified detection signal that the state decision circuit can easily process to determine leakage states.
3Measurement precision
If continuous monitoring is performed, then leakage detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The leakage detection is performed periodically during memory operations rather than continuously. The comparison circuit activates during specific operation phases (program, read, erase) to detect leakage at critical moments, providing sufficient detection accuracy while avoiding constant monitoring that would waste energy.
Solution Approach 2:
The detection signal is prepared in advance by the comparison circuit during voltage transfer phases, allowing the state decision circuit to make rapid leakage state determinations without requiring continuous analysis. This preliminary preparation of detection information enables accurate monitoring only when needed.
Data Source
AI summary
A leakage detection circuit may include: a comparison circuit configured to compare an input voltage, which changes based on the level of an operation voltage node, to a reference voltage and configured to output a detection signal; and a state decision circuit configured to determine a count value that corresponds to a determination period based on the detection signal and configured to output leakage state information based on the count value.