Sense Amplification Precharge Control for Memory Leakage
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Solution Overview
Problem
As memory cell density increases in semiconductor devices, leakage current also increases, leading to shorter data retention times and the need for more frequent data re-writing operations, which is inefficient and affects data integrity.
Innovation Solution
A semiconductor device with a sense amplification unit, pull-up and pull-down driving units, and a post over-driving control unit that adjusts the initial period of the precharge mode by detecting voltage levels, optimizing the pulse width of driving signals to improve data retention and re-write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cell density is increased to increase memory capacity, then memory capacity is improved, but leakage current increases and data retention time becomes shorter
Solution Approach 1:
The patent applies preliminary action by performing a data re-writing operation during the precharge mode before the data is completely lost due to leakage current. The sense amplification unit re-senses and rewrites data to the memory cell during this preliminary period, ensuring data integrity is maintained before degradation occurs.
Solution Approach 2:
The patent implements continuity of useful action by making the sense amplification unit continuously operational during both active mode and precharge mode. Unlike conventional designs where the sense amplifier is disabled during precharge, this design keeps it active to perform both sensing and data re-writing operations, ensuring continuous data protection against leakage current.
2Reliability
If data re-writing operation is performed more frequently to maintain data integrity, then data retention reliability is improved, but operation time increases and efficiency decreases
Solution Approach 1:
The patent merges two separate operations into one: during precharge mode, the sense amplification unit simultaneously performs both the conventional precharge function and the data re-writing operation. This consolidation eliminates the need for separate re-writing operations, reducing total operation time while maintaining data integrity.
Solution Approach 2:
The patent utilizes the periodic precharge mode as the optimal time window for data re-writing. By scheduling the re-writing operation to occur during the regular precharge intervals rather than during active mode, the system efficiently protects data without extending the overall operation cycle.
3Reliability
If sense amplification unit operates during precharge mode to perform data re-writing, then data retention time is improved, but device complexity increases
Solution Approach 1:
The sense amplification unit is designed with multi-functionality to perform both traditional sensing operations during active mode and data re-writing operations during precharge mode. This universal design eliminates the need for separate dedicated re-writing circuits, maintaining simplicity while achieving enhanced data retention.
Solution Approach 2:
The sense amplification unit serves itself by performing data re-writing during precharge mode without requiring external intervention or additional dedicated circuits. The same unit that senses data also rewrites it, making the system self-sufficient and reducing overall device complexity.
Data Source
AI summary
A semiconductor device includes a sense amplification unit suitable for sensing and amplifying data loaded on a data line pair; a pull-up driving unit suitable for supplying a first voltage to a pull-up power line of the sense amplification unit as a pull-up driving voltage in an active mode, and supplying second voltage higher than the first voltage to the pull-up power line as the pull-up driving voltage during an initial period of a precharge mode; a pull-down driving unit suitable for supplying a third voltage to a pull-down power line of the sense amplification unit as a pull-down driving voltage during the active mode and the initial period of the precharge mode; and a post over-driving control unit suitable for adjusting the initial period of the precharge mode by detecting a voltage level of the pull-up power line.