Word Line Charge Integration for Uniform Memory Cell Read Timing
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Solution Overview
Problem
Memory devices experience performance and reliability issues due to varying charge integration durations of memory cells along a word line, leading to different electrical responses and reduced overall performance.
Innovation Solution
A method is implemented where the word line is deactivated before activating sense components to integrate charges from memory cells, ensuring uniform charge integration durations across the word line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the word line remains activated during the entire read operation, then memory cells at the first end of the word line experience longer charge integration duration, but memory cells at the second end experience shorter charge integration duration, leading to performance and reliability issues
Solution Approach 1:
The word line is deactivated before the read operation is completed, specifically before sense components are activated. This preliminary deactivation ensures that all memory cells along the word line experience uniform charge integration durations, preventing the reliability issues that would otherwise occur due to varying integration times across different memory cell locations
2Reliability
If the word line is deactivated early to ensure uniform charge integration duration, then read operation reliability improves, but the read operation timing becomes more complex
Solution Approach 1:
By deactivating the word line before sense component activation, the patent establishes a predetermined timing sequence that ensures uniform charge integration across all memory cells. This preliminary action simplifies the overall timing control by creating a clear sequence: word line activation → charge integration → word line deactivation → sense component activation, rather than requiring complex coordination to maintain uniform integration durations throughout the entire read operation
Data Source
AI summary
Methods, systems, and devices for word line charge integration are described. In some examples, a memory device may include a plurality of memory cells that are coupled with a word line and respective digit lines. During a read operation, the word line may be activated (e.g., driven to a voltage) and a subset of the respective digit lines may be activated (e.g., driven to a voltage) to begin integrating charges of each of the memory cells. Before each digit line is activated, the word line may be deactivated and the remaining digit lines may be activated (e.g., driven to a voltage) to begin integrating charges of the remaining memory cells that are coupled with the word line. After each of the digit lines are selected, respective sense components may be activated to sense the charges associated with the memory cells.