Split Gate Transistors for Transient Pulse Protection
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Solution Overview
Problem
Integrated circuits with power transistors are prone to malfunction due to fast transient voltage pulses, which affect their switching characteristics and resistance against transient voltage pulses.
Innovation Solution
The integration of a first and second field effect transistor structure with electrically separated gate electrode structures and field electrode structures, where the second field effect transistor structure acts as a protection switch to bypass fast transient signals, thereby protecting the integrated circuit from destructive currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a field electrode is capacitively coupled to the drift zone to achieve low gate-to-drain capacitance, then switching characteristics are improved, but the transistor becomes vulnerable to fast transient voltage pulses
Solution Approach 1:
The gate electrode structure is divided into two electrically independent gates: a first gate for controlling switching operations and a second gate for protecting against transient voltage pulses. This segmentation allows each gate to independently perform its specific function without interfering with the other, resolving the contradiction between fast switching and transient protection.
Solution Approach 2:
The second gate acts as an intermediary protective layer between the transient voltage pulses and the sensitive transistor channel. By placing this intermediate gate with appropriate capacitive coupling to the drift zone, transient pulses are blocked while allowing the first gate to maintain optimal switching characteristics.
2Productivity
If the gate electrode is coupled to the drift zone to reduce gate-to-drain capacitance, then switching speed is improved, but susceptibility to transient pulses increases
Solution Approach 1:
The gate system is segmented into two independent gates with distinct functions. The first gate maintains optimal capacitive coupling for fast switching, while the second gate provides transient pulse protection through separate capacitive coupling, eliminating the trade-off between switching speed and transient susceptibility.
Solution Approach 2:
Different regions of the gate electrode structure have different electrical characteristics and coupling configurations. The first gate region is optimized for switching speed with specific capacitive coupling, while the second gate region is optimized for transient protection with different capacitive coupling, allowing each local region to perform its specialized function.
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 configuration enhances the switching characteristics and resistance against transient voltage pulses, ensuring efficient operation and protection of the integrated circuit by effectively managing fast transient signals.
Implementation Method 1
a field electrode, which is capacitively coupled to a drift zone of the power transistor
Data Source
AI summary
An integrated circuit includes a first and a second field effect transistor structure. The first field effect transistor structure includes a first gate electrode structure and a first field electrode structure. The second field effect transistor structure includes a second gate electrode structure and a second field electrode structure. The first and the second gate electrode structures are electrically separated from each other. The first and the second field electrode structures are separated from each other.