Digital Temperature Compensation for Memory Signal Stability
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Solution Overview
Problem
Temperature variations in integrated circuits affect the nominal operating characteristics of memory cells, leading to changes in threshold voltage distributions, which impact reading, programming, and verifying operations, necessitating a need for temperature compensation of signals.
Innovation Solution
A temperature compensation circuit in memory devices generates digital representations of temperature, using a temperature sensor and logic circuit to calculate and adjust voltage and timing signals, ensuring consistent operation across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation is implemented using a temperature sensor and logic circuit, then the decision edge of the sense amplifier is maintained and distribution width is reduced, but device complexity increases
Solution Approach 1:
The patent uses a digital copy of the temperature (from the temperature sensor) to control voltage and timing adjustments. Instead of direct analog temperature compensation, a digital representation is created and processed through logic circuits to generate compensation signals, reducing circuit complexity while maintaining compensation effectiveness
Solution Approach 2:
The patent changes operational parameters (voltage levels and timing) based on temperature measurements. The logic circuit calculates adjusted voltage and timing values from the temperature digital representation, and these parameter changes are applied to memory operations to compensate for temperature effects
2Stability of the object's composition
If temperature compensation is implemented, then consistent operation across varying temperatures is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces direct analog temperature compensation mechanisms with a digital signal processing approach. A temperature sensor generates a digital representation, which is then processed through logic circuits to generate compensation signals. This substitution of analog mechanisms with digital ones reduces sensitivity to manufacturing precision variations
Solution Approach 2:
The patent performs temperature measurement and compensation parameter calculation in advance of actual memory operations. The temperature digital representation is generated and processed through logic circuits beforehand, so that when memory operations occur, the appropriate voltage and timing adjustments are already ready, ensuring consistent operation without requiring high precision during the operations themselves
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 maintains the decision edge of the sense amplifier and reduces distribution width, minimizing the impact of temperature changes on memory operations, thereby improving the reliability and accuracy of read and verify operations.
Implementation Method 1
A temperature sensor and logic circuit in a memory device generate a digital representation of a temperature of the integrated circuit
Data Source
AI summary
A temperature sensor generates a digital representation of the temperature of the integrated circuit. A logic circuit reads the digital temperature and generates a multiple bit digital representation of an operational voltage and a multiple bit digital representation of a timing signal, both being functions of the integrated circuit temperature. A voltage generator converts the digital representation of the operational voltage to an analog voltage that biases portions of the integrated circuit requiring temperature compensated voltages. In one embodiment, the temperature compensated voltages bias memory cells. A timing generator converts the multiple bit digital representation of the timing signal to a logic signal.