Memory Page Buffer Temperature Compensation via Dynamic Pre-Charge
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Solution Overview
Problem
The operating characteristics of memory device page buffers vary with temperature changes, leading to operation errors and reduced data reliability during writing and reading processes.
Innovation Solution
A memory device with a page buffer circuit connected to a memory cell array through bit lines, where a control logic differentially controls the pre-charge operation of the page buffer based on detected temperature, adjusting the pre-charge period and bit line shutoff signal offsets accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pre-charge operation is performed with a fixed pre-charge period regardless of temperature, then the device complexity is reduced, but the reliability deteriorates due to operation errors caused by temperature variations
Solution Approach 1:
The pre-charge period is made dynamic by adjusting its duration based on detected temperature. The control logic selects between a first pre-charge period for a first temperature range and a second pre-charge period for a second temperature range, allowing the system to adapt to temperature changes and maintain reliable operation without excessive complexity
Solution Approach 2:
The patent changes the temporal parameter (pre-charge period duration) in response to temperature changes. By modifying the time parameter based on temperature detection, the system maintains optimal performance across different operating conditions while using relatively simple control logic
2Reliability
If the pre-charge period is extended to ensure reliable operation at all temperatures, then the reliability is improved, but the productivity deteriorates due to slower data reading speed
Solution Approach 1:
The pre-charge period duration is dynamically adjusted based on temperature conditions. At lower temperatures where longer pre-charge is needed for reliability, the system extends the period. At higher temperatures where shorter pre-charge suffices, the system reduces the period, thus maintaining reliability while maximizing data reading speed across different operating conditions
Solution Approach 2:
The system changes the time parameter (pre-charge period) based on temperature to achieve optimal balance between reliability and speed. By using temperature-based parameter adjustment, the patent avoids the need for a consistently extended pre-charge period, thereby maintaining high productivity while ensuring reliability
3Productivity
If the pre-charge period is shortened to increase data reading speed, then the productivity is improved, but the reliability worsens due to operation errors at certain temperatures
Solution Approach 1:
The pre-charge period is dynamically set based on temperature detection. The control logic selects an appropriate pre-charge period (first or second) based on whether the temperature falls within a first or second range, ensuring that the period is neither too long nor too short for the current operating conditions, thus maintaining both speed and reliability
Solution Approach 2:
The patent adjusts the time parameter (pre-charge period) according to temperature to optimize the balance between speed and reliability. By using temperature-based parameter selection, the system achieves short pre-charge periods (high speed) when conditions permit while extending them (maintaining reliability) when temperature requires it
4Reliability
If temperature compensation is not applied, then the device complexity is reduced, but the reliability deteriorates due to page buffer characteristic variations with temperature
Solution Approach 1:
The page buffer operation is made dynamic through temperature-based control. The control logic detects temperature and adjusts the pre-charge period accordingly, allowing the system to compensate for temperature-induced characteristic changes in the page buffer and memory cell array without requiring complex compensation circuits
Solution Approach 2:
The patent changes the operational parameter (pre-charge period) in response to temperature changes to compensate for variations in page buffer characteristics. This simple parameter adjustment approach maintains data storage reliability across temperature ranges while avoiding the need for complex temperature compensation mechanisms
Data Source
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AI summary
A memory device for performing temperature compensation and an operating method thereof are provided. The memory device includes a memory cell array; a page buffer circuit connected to the memory cell array through a plurality of bit lines, including a page buffer connected to each of the plurality of bit lines, and configured to perform a pre-charge operation during a pre-charge period for data reading; and a control logic configured to differently control the pre-charge operation of the page buffer circuit according to a detected temperature, wherein the pre-charge period includes a first period in which the plurality of bit lines are overdriven and a second period in which the plurality of bit lines are driven at a voltage lower than that of the first period, and the first period where the detected temperature is a first temperature is set to be shorter than the second period where the detected temperature is a second temperature higher than the first temperature.