MOS Transistor Gate Voltage Determination for Stability
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Solution Overview
Problem
Conventional methods for determining the gate voltage of MOS transistors to turn them off-state are inefficient, leading to fluctuation in threshold voltage due to hole trapping at the interface, which affects the transistor's on-state performance.
Innovation Solution
A gate voltage determination apparatus and method that measures current-voltage characteristics to determine the off-gate voltage based on the hole injection start voltage, setting it higher than the effective hole injection start voltage to suppress threshold voltage fluctuation and reduce erroneous turning on due to noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a negative voltage is applied to the gate electrode to turn the MOS transistor off, then the transistor is turned off, but threshold voltage fluctuation occurs due to hole trapping at the interface
Solution Approach 1:
The patent changes the gate voltage parameter from a fixed negative value to a dynamically determined value based on measured current-voltage characteristics. By determining the hole injection start voltage through measurement and setting the off-gate voltage relative to this measured parameter, the solution adapts to the specific transistor's characteristics, thereby suppressing threshold voltage fluctuation while ensuring reliable off-state.
2Ease of manufacture
If conventional methods are used to determine gate voltage, then the process is simple, but threshold voltage fluctuation occurs affecting on-state performance
Solution Approach 1:
The patent replaces the conventional simple voltage application method with a measurement-based determination system. By using current-voltage characteristic measurement and automated analysis to determine the optimal off-gate voltage, the system substitutes empirical methods with precise electrical characterization, achieving both improved reliability and maintained ease of manufacture through automated testing.
3Productivity
If the off-gate voltage is set without precise measurement, then the process is fast, but erroneous turning on occurs due to noise
Solution Approach 1:
The patent performs preliminary measurement of current-voltage characteristics before setting the off-gate voltage. By conducting the measurement and determination of the hole injection start voltage in advance, the system establishes a reliable reference point that enables robust noise immunity. This preliminary characterization allows the transistor to withstand noise disturbances without erroneous turning on.
Data Source
AI summary
Provided is a gate voltage determination apparatus of a MOS transistor having a gate electrode, a gate insulating film and a channel region, the gate voltage determination apparatus including: a characteristic acquisition unit configured to acquire current-voltage characteristics showing a relationship between a gate current flowing through the gate electrodes and a gate voltage when the gate voltage applied to the gate electrode is changed from a higher voltage side to a lower voltage side; and a voltage determination unit configured to determine, based on a value of the gate voltage at which the gate current shows a peak waveform in the current-voltage characteristics, an off-gate voltage to be applied to the gate electrode when turning off the MOS transistor.