Semiconductor Memory Word Line Deactivation Voltage Control
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Solution Overview
Problem
Semiconductor memory devices face challenges in maintaining data integrity due to leakage currents in memory cells, requiring frequent refresh operations, which affects their refresh characteristic and operational efficiency.
Innovation Solution
A semiconductor memory device that includes a temperature detection block, an off voltage generation block, and a word line driving block to generate and apply word line deactivation voltages with varying levels based on temperature, reducing leakage current by controlling the voltage levels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If refresh operations are performed frequently to prevent data loss, then data integrity is improved, but operational efficiency deteriorates
Solution Approach 1:
The patent changes the voltage level parameter of the word line deactivation signal based on temperature conditions. At higher temperatures, a lower voltage level (e.g., 0V or negative voltage) is applied to reduce leakage current, while at lower temperatures, a higher voltage level is used. This dynamic parameter adjustment reduces the need for frequent refresh operations, improving both data integrity and operational efficiency
2Reliability
If the refresh cycle is shortened to prevent data loss, then data retention reliability is improved, but time consumption increases
Solution Approach 1:
The system dynamically changes the deactivation voltage parameter based on temperature detection. When high temperature is detected, the voltage level is adjusted to reduce leakage current, thereby extending data retention time and allowing longer refresh cycles. This reduces the frequency of refresh operations and minimizes time loss without compromising data retention reliability
3Device complexity
If a fixed word line deactivation voltage is used, then device complexity is reduced, but leakage current increases at high temperatures
Solution Approach 1:
The patent implements a dynamic voltage control system where the word line deactivation voltage level is adjusted based on temperature conditions. A temperature detection block monitors the temperature and controls the voltage level accordingly - using lower voltage levels at high temperatures to reduce leakage current, and higher voltage levels at low temperatures. This dynamic adaptation effectively reduces leakage current without requiring complex additional circuitry
Solution Approach 2:
The system changes the voltage level parameter of the word line deactivation signal based on temperature. By using multiple voltage levels (e.g., first voltage level at normal temperature, second lower voltage level at high temperature), the system reduces leakage current at elevated temperatures while maintaining simplicity through a straightforward temperature-based control mechanism
Data Source
AI summary
A semiconductor memory device includes a plurality of memory cells coupled to multiple word lines a word line deactivation voltage generation block suitable for generating word line deactivation voltages having different voltage levels corresponding to temperature ranges, and a word line driving block suitable for driving a word line to be deactivated with the word line deactivation voltages selected from the word line deactivation voltages.