Semiconductor Memory Device Strobe Signal Activation Time Control
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Solution Overview
Problem
Existing semiconductor memory devices face challenges in accurately performing read operations due to variations in temperature and word line positions, leading to unreliable data retrieval.
Innovation Solution
The semiconductor memory device employs a control logic that determines different activation times for strobe signals based on the position of word lines and temperature measurements, using a lookup table to store optimal activation times for each word line group, thereby improving read operation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fixed activation time for strobe signals is used for all word lines, then the control logic is simple, but read operation reliability deteriorates due to temperature and word line position variations
Solution Approach 1:
The patent applies local quality by determining different activation times for strobe signals based on the specific position of word lines. Instead of using a uniform activation time for all word lines, the system tailors the activation time to each word line group, compensating for local variations in threshold voltage distributions and sensing current characteristics caused by temperature changes.
Solution Approach 2:
The patent implements dynamics by making the strobe signal activation time variable rather than fixed. The activation time is dynamically adjusted based on real-time temperature measurements and the position of the word line being accessed, allowing the system to adapt to changing operating conditions and maintain optimal read operation reliability.
2Reliability
If different activation times are applied for each word line position, then read operation reliability improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the word lines into multiple groups based on their positions. Each word line group is assigned a specific activation time for strobe signals. This segmentation approach reduces the complexity compared to individual word line control while still providing tailored activation times for different regions, thereby improving read operation reliability.
Solution Approach 2:
The patent utilizes parameter changes by varying the activation time parameter of strobe signals according to word line position and temperature conditions. The control logic adjusts this critical parameter dynamically, selecting appropriate activation times from predefined values or calculated values based on the current operating conditions, thus optimizing reliability without excessive complexity.
3Measurement precision
If activation time is adjusted according to temperature, then sensing accuracy improves, but the system becomes more complex
Solution Approach 1:
The patent implements feedback by incorporating temperature measurement into the control process. The system continuously monitors temperature and uses this information to adjust the activation time of strobe signals accordingly. This feedback mechanism ensures that sensing accuracy is maintained across different temperature conditions while using a manageable level of complexity through integrated temperature sensing and control logic.
Data Source
AI summary
A semiconductor memory device may include a control logic. The control logic may be coupled to bit lines through a read and write (read/write) circuit and to word lines. The control logic is configured to determine a duration of an activation time of a strobe signal for the read/write circuit.