Semiconductor Memory Device Temperature Compensation Locking
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Solution Overview
Problem
Semiconductor memory devices face deterioration in data reading accuracy due to temperature variations, which can lead to increased bit errors beyond the correction capability of error correction circuits, especially during threshold voltage distribution fluctuations.
Innovation Solution
Incorporating a temperature detecting element and a control unit in the semiconductor memory device to determine a compensation value for read voltage based on detected temperature, locking this value for subsequent operations to maintain consistent read accuracy, and employing Vth tracking and soft bit reading techniques to minimize errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation is continuously updated during multiple reading operations, then reading accuracy can be maintained under varying temperature conditions, but temperature fluctuations during the reading process cause different compensation values to be applied, reducing reading precision
Solution Approach 1:
The patent applies preliminary action by determining the temperature compensation value before the multiple reading operations begin, and locking it to remain constant throughout the reading process. This ensures that the same compensation value is used consistently across all readings, eliminating the problem of varying compensation values caused by temperature fluctuations during reading.
Solution Approach 2:
The patent implements dynamics by allowing the temperature compensation value to be updated between different reading operations or batches, rather than being fixed permanently. This enables the system to adapt to overall temperature changes while maintaining consistency within each reading operation, balancing adaptability with stability.
2Reliability
If error correction circuits are used to handle bit errors, then data integrity can be maintained, but bit errors increase beyond correction capability when threshold voltage distribution fluctuates due to temperature variations
Solution Approach 1:
The patent employs feedback by using the results of error correction to determine whether to perform Vth tracking. When bit errors exceed the correction capability, the system triggers Vth tracking to adjust the threshold voltage distribution, thereby reducing errors and improving data integrity in subsequent operations.
Solution Approach 2:
The patent applies parameter changes by adjusting the threshold voltage distribution through Vth tracking when temperature-induced fluctuations cause excessive bit errors. This dynamic adjustment of voltage parameters ensures that the memory device maintains reliable operation across varying temperature conditions.
3Measurement precision
If Vth tracking and soft bit reading are employed to minimize errors, then reading precision is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies preliminary action by determining and locking the temperature compensation value before performing Vth tracking or soft bit reading operations. This preliminary setup simplifies the overall control by establishing a stable baseline, reducing the complexity of managing multiple changing parameters during the error-minimizing 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
This approach effectively suppresses the deterioration of data reading precision by accounting for temperature-induced variations in memory cell transistor characteristics, reducing bit errors through consistent temperature compensation and enhanced error correction processes.
Implementation Method 1
a temperature detecting element configured to detect a temperature
Data Source
AI summary
A semiconductor memory device includes a memory cell transistor, a word line coupled to the memory cell transistor, a temperature detection element configured to detect a temperature, and a control unit. The control unit is configured to determine, responsive to receiving a first command from a controller, a compensation value for a read voltage designated by the controller according to the detected temperature, and to lock updating of the compensation value.