Memory Reference Voltage Compensation for Temperature Variation
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Solution Overview
Problem
Semiconductor memory devices face challenges in efficiently adjusting reference voltages for program, read, and erase operations due to temperature variations, which affect the performance and reliability of nonvolatile memory cells.
Innovation Solution
A temperature compensation circuit is implemented to generate a compensation offset voltage based on temperature-varying and constant voltages, adjusting reference voltages applied to word lines and bit lines to ensure optimal operation across different temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference voltages are adjusted for temperature compensation, then memory cell operation reliability is improved, but device complexity increases due to additional temperature compensation circuit components
Solution Approach 1:
A temperature compensation circuit is introduced as an intermediary component that generates compensation voltages based on temperature variations. This circuit includes temperature sensing elements and voltage adjustment mechanisms that automatically compensate for temperature effects on reference voltages, thereby improving memory cell operation reliability without requiring complex external control systems.
Solution Approach 2:
The temperature compensation circuit incorporates feedback mechanisms that continuously monitor temperature changes and adjust reference voltages accordingly. The circuit uses temperature-dependent components to generate compensation signals that are fed back to the voltage reference sources, creating a self-regulating system that maintains stable operation across temperature variations.
2Manufacturing precision
If temperature compensation circuit is added, then linearity and effectiveness of temperature compensation is improved, but manufacturing complexity increases
Solution Approach 1:
The temperature compensation circuit utilizes parameters such as temperature coefficients of resistors and voltage references to achieve linear compensation. By carefully selecting components with matched temperature coefficients and designing the circuit topology to provide linear voltage adjustment, the circuit achieves improved linearity and effectiveness in temperature compensation while maintaining manufacturability through standard component values and configurations.
Data Source
AI summary
A memory device includes a memory cell array including a plurality of memory cells connected to a plurality of word lines and a plurality of bit lines, a voltage generator configured to output a first voltage that varies according to temperature of the memory device, a second voltage that is constant regardless of the temperature, and a first reference voltage applied to at least one line among the plurality of word lines and the plurality of bit lines, and a temperature compensation circuit configured to generate a compensation offset voltage based on the first voltage and the second voltage, and output a second reference voltage based on the first reference voltage and the compensation offset voltage.