Leakage Current Detection in Memory Power Circuits
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Solution Overview
Problem
Leakage current in memory devices can lead to data loss and inaccurate reading operations due to defects in manufacturing or progressive defects during use, affecting the stability of driving lines and memory cells.
Innovation Solution
A device comprising an oscillator, charge pump, and counter to generate and detect the frequency of clock signals, allowing for the detection of leakage current in memory devices, which includes a power circuit to output driving power and a controller IC to manage memory elements, utilizing built-in logic to identify and mitigate leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leakage current detection is implemented using traditional methods, then data loss can be prevented, but device complexity increases due to additional detection circuits
Solution Approach 1:
The oscillator serves multiple functions: it generates clock signals for normal memory operation and simultaneously enables leakage current detection through frequency measurement. The counter circuit, while adding some complexity, provides dual functionality by measuring clock frequency and generating detection signals, thereby reducing the need for entirely separate detection hardware.
Solution Approach 2:
The system uses its own internal clock signal and frequency measurement capabilities to detect leakage current, rather than requiring completely external detection mechanisms. The memory device's existing operational components are leveraged for self-diagnosis, minimizing additional circuitry.
2Reliability
If continuous monitoring of driving power is performed to detect leakage current, then reliability is improved, but energy consumption increases
Solution Approach 1:
The leakage current detection is performed periodically by measuring the clock signal frequency at intervals, rather than continuously monitoring the driving power. This periodic measurement approach maintains reliability by detecting leakage events while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The patent replaces direct electrical measurement of leakage current with an indirect mechanical-like approach: measuring the frequency of an oscillator whose operation is affected by leakage current. This substitution reduces energy consumption by using timing-based measurement rather than continuous power sensing.
3Measurement precision
If the clock signal frequency is adjusted to compensate for leakage current, then data reading accuracy is improved, but device complexity increases due to frequency adjustment mechanisms
Solution Approach 1:
The system implements feedback by measuring the clock frequency, comparing it to expected values, and using this information to detect and compensate for leakage current effects. The counter measures frequency, and this measurement feeds back to the control logic which adjusts operations or notifies users, creating a closed-loop system that improves reading accuracy without requiring complex real-time frequency adjustment hardware.
Solution Approach 2:
The patent changes the operational parameters (clock frequency) in response to detected leakage current. By measuring frequency shifts caused by leakage and adjusting reading operations accordingly, the system maintains data accuracy through parameter adaptation rather than complex hardware adjustments.
Data Source
AI summary
A memory device includes a controller and a power circuit for a plurality of memory cells. The power circuit detects the frequency of at least one clock signal generated in the power circuit and generates comparative data based on the frequency. The controller detects leakage current in the power based on the comparative data.