Flash Memory Voltage Generator Temperature Compensation
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Solution Overview
Problem
Flash memory devices experience data corruption due to variations in operating temperature, which affect the operating characteristics and lead to read and verify errors, necessitating voltage generators that can adjust for temperature-related changes.
Innovation Solution
The implementation of a word line voltage generator that adjusts read and verify voltages based on the operating temperature and specific data state of memory cells, using temperature sensing circuitry and voltage generation circuitry to compensate for threshold voltage shifts, thereby ensuring accurate data retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If flash memory devices operate at varying temperatures, then power consumption and memory density are improved, but threshold voltage shifts cause data corruption and read errors
Solution Approach 1:
The voltage generator dynamically adjusts read and verify voltages based on detected temperature changes. The system transitions from static voltage operation to dynamic voltage modulation, where voltage levels are continuously adapted to compensate for temperature-induced threshold voltage shifts in flash memory cells, thereby maintaining data integrity across varying operating conditions
Solution Approach 2:
The patent changes the voltage parameter as a function of temperature. By detecting temperature variations and adjusting voltage levels accordingly, the system compensates for threshold voltage shifts caused by thermal effects. This parameter adjustment ensures that read and verify operations remain accurate despite temperature-induced changes in memory cell characteristics
2Device complexity
If fixed voltages are used for read operations, then device complexity is reduced, but temperature variations cause read errors and data corruption
Solution Approach 1:
The voltage generator transitions from fixed voltage output to dynamic voltage adjustment. By incorporating temperature sensing and feedback mechanisms, the system automatically modulates read and verify voltages in response to temperature changes, eliminating the need for manual voltage selection and improving read operation accuracy across different thermal conditions
Solution Approach 2:
The system implements feedback by detecting temperature variations and using this information to adjust voltage levels. The temperature detection circuit monitors operating conditions and provides input to the voltage generator, which then modifies voltage outputs accordingly. This closed-loop feedback mechanism ensures accurate read operations despite temperature-induced threshold voltage shifts
3Reliability
If temperature compensation is implemented, then data integrity is improved, but device complexity increases due to additional sensing and adjustment circuitry
Solution Approach 1:
The voltage generator is designed to perform multiple functions: it generates read voltages, verify voltages, and temperature-compensated voltages using a unified circuit architecture. By integrating temperature sensing and voltage adjustment capabilities into a single multi-functional generator, the system achieves data integrity improvement without proportionally increasing device complexity
Data Source
AI summary
Voltage generation devices and methods are useful in determining a data state of a selected memory cell in a memory device. Voltages can be generated in response to a first current and a second current. The first current is responsive to a memory device operation and a memory cell data state associated with the memory device operation, while the second current is responsive to a temperature associated with the memory device and to the memory cell data state associated with the memory device operation.