Non-volatile Memory Temperature Compensation Circuit
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Solution Overview
Problem
Non-volatile memory devices, such as flash memory, face challenges in maintaining data integrity due to shifts in threshold voltage caused by temperature changes, program disturbance, read disturbance, and charge loss, which hinder the realization of multi-level cells storing more bits and fail to keep up with high data capacity and rate requirements.
Innovation Solution
A semiconductor memory device with a voltage generator that adjusts DC voltage based on current temperature, using a control logic to activate temperature detection and adjustment operations, ensuring optimal voltage levels for various operation modes, thereby compensating for cell characteristic changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold voltage compensation techniques are applied to maintain data integrity, then reliability is improved, but signal delay increases and productivity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in lookup tables during manufacturing. The temperature compensation process simply retrieves pre-computed values based on detected temperature, rather than performing complex real-time calculations. This allows reliability improvement through accurate compensation while maintaining high speed by avoiding computational delays during operation.
Solution Approach 2:
The patent replaces complex real-time threshold voltage compensation mechanisms with a simplified system using temperature detection and pre-stored compensation tables. Instead of performing elaborate voltage adjustment calculations during operation, the system substitutes this with direct table lookup based on temperature, significantly reducing signal delay while maintaining compensation effectiveness.
2Reliability
If DC voltage levels are adjusted according to temperature to compensate for cell characteristics, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the memory device to automatically detect its own temperature and retrieve appropriate compensation values from internal lookup tables. The system compensates for its own threshold voltage shifts without requiring external intervention or complex control circuitry, thereby improving reliability while minimizing added complexity.
Solution Approach 2:
The patent changes the operating parameter (DC voltage level) based on temperature detection to compensate for cell characteristic shifts. By dynamically adjusting voltage levels according to temperature conditions and using pre-stored compensation data, the system maintains consistent performance across varying temperatures without requiring complex hardware modifications.
3Manufacturing precision
If temperature detection and compensation operations are activated, then manufacturing precision is improved, but ease of operation deteriorates due to additional control steps
Solution Approach 1:
The patent merges the temperature detection and compensation operations with the existing read and program operations. The compensation is integrated into the normal operation flow rather than being a separate step, so that threshold voltage control is improved without significantly increasing the number of user-facing operation steps. The control logic automatically handles compensation during standard memory operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes the influence of temperature changes on memory cell distributions, ensuring high reliability and maintaining performance across different operational conditions, thus supporting high data capacity and rate demands.
Implementation Method 1
a voltage generator adjusting a DC voltage supplied into the semiconductor memory device according to a current temperature
Data Source
AI summary
Provided is a semiconductor memory device. The semiconductor memory device includes: a voltage generator adjusting a DC voltage supplied into the semiconductor memory device according to a current temperature; and a control logic activating a temperature detection operation of the voltage generator and an adjustment operation of the DC voltage according to an operation mode, wherein the voltage generator adjusts the DC voltage according to offset information about the semiconductor memory device.