SOM Memory Initialization Leakage Current Control
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Solution Overview
Problem
The initialization operation in selector only memory (SOM) devices leads to increased leakage current, which can cause failure in initializing other SOM devices at lower priority.
Innovation Solution
A memory device and method that apply specific voltage configurations to bit lines and word lines to minimize leakage current during initialization, including applying an adjustment voltage to adjacent initialized memory cells and reversing polarities for subsequent initialization operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If initialization operation is performed on SOM devices, then threshold voltage is adjusted to operating range, but leakage current increases
Solution Approach 1:
The initialization operation is divided into multiple stages with different voltage applications. First, a first voltage is applied to adjust threshold voltage of the target cell. Then, a second voltage is applied to adjacent initialized cells to suppress their leakage current. This segmentation allows threshold voltage adjustment while controlling leakage current effects on other cells.
Solution Approach 2:
Different voltage levels are applied to different cells based on their initialization status. The target cell receives the first voltage for threshold adjustment, while adjacent already-initialized cells receive the second voltage to suppress leakage. This local differentiation ensures that leakage current from initialized cells does not interfere with the initialization of target cells.
2Manufacturing precision
If initialization operation is performed on adjacent memory cells, then threshold voltage is adjusted, but leakage current prevents subsequent initialization operations
Solution Approach 1:
Before initializing the target cell, the circuit applies the second voltage to adjacent already-initialized cells to suppress their leakage current in advance. This preliminary action prevents the leakage current from interfering with the subsequent initialization operation of the target cell, ensuring reliable initialization across all cells.
Data Source
AI summary
A memory device includes word lines, bit lines, memory cells, and a circuit. The circuit applies a first voltage to a first bit line of a target memory cell, applies a second voltage to a first word line of the target memory cell, and performs at least one of a first operation and a second operation. The first operation includes applying an adjustment voltage to a second bit line or second word line connected to an adjacent initialized memory cell, and the second operation includes applying a third voltage of an opposite polarity to the first voltage to a third bit line of a next target memory cell that is initialized after initialization of the target memory cell and applying a fourth voltage of an opposite polarity to the second voltage to a third word line of the next target memory cell.