Flash Memory HTOL Testing Voltage Configuration
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Solution Overview
Problem
High temperature operating life (HTOL) tests for flash memory are affected by voltage differences between components, leading to charge leakage and inaccurate test results after multiple cycling rounds.
Innovation Solution
Adjusting the voltages applied to the source, control gate, and substrate in flash memory during HTOL testing to eliminate voltage differences, specifically setting the source and control gate to ground voltage and the substrate to power supply voltage, thereby reducing the electric field strength and minimizing charge leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage settings are used during HTOL testing, then the test can be performed with standard procedures, but voltage differences between components cause charge leakage and inaccurate test results
Solution Approach 1:
The patent applies parameter changes by modifying the voltage settings applied to different components (source, control gate, substrate) during HTOL testing. Specifically, the source and control gate are set to ground voltage (0V) while the substrate is set to power supply voltage (e.g., 1.8V), creating a specific voltage differential configuration that eliminates harmful voltage differences between components and prevents charge leakage, thereby improving test result accuracy
Solution Approach 2:
The patent implements equipotentiality by ensuring that the control gate and source are both at ground voltage (0V), creating equal potential conditions between these components. This eliminates the voltage difference that would otherwise cause charge leakage from the control gate to the source, thereby improving reliability and reducing harmful effects during HTOL testing
2Reliability
If voltage differences exist between components during HTOL testing, then the test structure remains simple, but charge leakage occurs leading to inaccurate results after multiple cycling rounds
Solution Approach 1:
The patent changes the voltage parameters applied to the flash memory components during testing. By setting the source and control gate to ground voltage and the substrate to power supply voltage, the invention creates optimal voltage conditions that maintain charge storage capability and prevent charge leakage, thereby improving both reliability and measurement precision of HTOL test results
3Ease of operation
If standard voltage settings are used, then the testing process is straightforward, but voltage differences cause charge leakage that affects test accuracy after cycling
Solution Approach 1:
The patent modifies the voltage parameters in a systematic way that maintains ease of operation while improving reliability. The specific configuration (source and control gate at ground voltage, substrate at power supply voltage) is implemented through straightforward voltage control circuits, making the testing process remain simple while effectively preventing charge leakage and improving test accuracy
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 method improves the charge storage capability of the control gate, ensuring accurate and reliable HTOL test results by reducing voltage differences and preventing charge leakage, as demonstrated by simulation results showing no shift in control gate voltage after testing.
Implementation Method 1
Adjusting the voltages further includes setting the voltage that is applied to the source to a ground voltage, setting the voltage that is applied to the control gate to the ground voltage, and setting the voltage that is applied to the substrate to a power supply voltage
Data Source
AI summary
A method for setting voltages in a flash memory for high temperature operating life (HTOL) testing is provided. The flash memory includes a substrate, a source, and a control gate. The method includes adjusting the voltages that are applied to the source, the control gate, and the substrate, such that there is no voltage difference between the control gate and the source, and no voltage difference between the control gate and the substrate. Specifically, adjusting the voltages includes setting the voltage that is applied to the source to a ground voltage, setting the voltage that is applied to the control gate to the ground voltage, and setting the voltage that is applied to the substrate to a power supply voltage.