GaN Gate Current Limiting Circuit for Breakdown Voltage Gain
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Solution Overview
Problem
Current methods for increasing the breakdown voltage of GaN transistors are costly and require process or material changes, limiting the flexibility and efficiency in achieving higher breakdown voltages without altering device parameters.
Innovation Solution
A current limit circuit apparatus is designed to limit the gate current of GaN transistors using a diode, transistors, and resistors, allowing for flexible circuit design without changing process conditions or materials, thereby increasing breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If different process or material is used to increase breakdown voltage, then breakdown voltage is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
A current limit circuit is introduced as an intermediary component between the gate and ground. This circuit includes a current limit transistor configured to limit the gate current when the GaN transistor is in cutoff region, thereby increasing breakdown voltage without requiring changes to the GaN transistor's process or material
Solution Approach 2:
The invention changes the operational parameters by controlling the gate current through the current limit circuit. By adjusting the gate current parameter externally rather than changing the intrinsic material properties, the breakdown voltage is improved while maintaining the same manufacturing process
2Strength
If different process or material is used to increase breakdown voltage, then breakdown voltage is improved, but device complexity increases
Solution Approach 1:
The current limit circuit serves as an external intermediary that manages gate current without requiring complex modifications to the GaN transistor fabrication process. The circuit can be integrated using standard CMOS processes, avoiding the need for specialized or complex manufacturing steps
Solution Approach 2:
The functionality is segmented into two independent parts: the GaN transistor itself remains simple and unchanged, while the current limit circuit handles the complexity of breakdown voltage enhancement. This segmentation allows each component to be optimized independently
3Strength
If gate current is limited to increase breakdown voltage, then breakdown voltage is improved, but gate current control complexity increases
Solution Approach 1:
The current limit transistor is configured to automatically activate when needed. When the GaN transistor is in cutoff region and gate current exceeds a certain level, the current limit transistor self-activates to limit the current, eliminating the need for complex external control circuits
Solution Approach 2:
The circuit employs feedback mechanisms where the gate current status is monitored and automatically regulated by the current limit transistor. This feedback control ensures gate current is limited only when necessary, simplifying overall control complexity
Data Source
AI summary
The present invention provides a current limit circuit apparatus, coupled with the gate of a GaN transistor. The current limit circuit comprises a diode, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor and a fourth resistor. The source and the drain of the first transistor couple with the diode. The source of the second transistor couples with the gate of the first transistor. The source of the first transistor couples with the first transistor. The source of the second transistor couples with the second resistor. The third resistor couples with the fourth resistor and the gate of the first transistor. The first transistor turned off and the gate current is limited. When the current of the gate of the GaN transistor exceeds the predetermined value, the breakdown voltage is increased by limiting the gate current.