GaN Power Transistor Distributed Gate Architecture
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Solution Overview
Problem
Conventional power transistors face limitations in switching speed and efficiency due to high gate resistance and inefficient routing of interconnects on chip, which hinders the control of high-frequency operations in power electronic systems.
Innovation Solution
A distributed power switch and drive circuit architecture is implemented using a substrate with GaN-based sub-transistors and sub-drivers, where each sub-transistor has a gate, source, and drain, and the output of each sub-driver is connected to the gate of corresponding sub-transistors, reducing impedance and enhancing control over switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional gate drive circuits are used with external drivers and package housing, then device structure is simple, but gate resistance is high (1-10 ohms) limiting switching speed
Solution Approach 1:
The patent merges the gate drive circuit with the power transistor by integrating the driver directly into the same package housing, eliminating external drivers and reducing the number of interconnect paths. This integration reduces gate resistance from 1-10 ohms to lower values, thereby improving switching speed while maintaining structural simplicity.
Solution Approach 2:
The gate drive circuit is segmented into multiple distributed drive circuits, each connected to specific gate regions of the power transistor. This segmentation allows for optimized local driving and reduced overall gate resistance, improving switching speed without significantly increasing external complexity.
2Productivity
If conventional routing of interconnect on chip is used, then manufacturing is simple, but gate resistance is high limiting switching efficiency
Solution Approach 1:
The interconnect routing is optimized with different path configurations for different regions of the gate. The routing provides shorter and more direct paths to critical gate regions, reducing overall gate resistance and improving switching efficiency while remaining compatible with standard manufacturing processes.
3Speed
If GaN technology is used to reduce device size and capacitance, then switching speed increases, but control of switching operation becomes difficult
Solution Approach 1:
The integrated gate drive circuit acts as an intermediary between the control signal and the GaN power transistor. This intermediary provides the necessary drive strength and impedance matching to effectively control the fast-switching GaN device, making it easier to operate while maintaining the high switching speed benefits of GaN technology.
4Ease of operation
If distributed drive circuit with multiple sub-drivers is implemented, then gate resistance is reduced and control is improved, but device complexity increases
Solution Approach 1:
The distributed drive circuit is merged with the power transistor in a single integrated structure, reducing the need for external components and interconnects. This integration reduces the overall complexity increase that would normally result from adding multiple sub-drivers, while still achieving reduced gate resistance and improved control.
Data Source
AI summary
An electronic circuit is disclosed. The electronic circuit includes a distributed power switch. In some embodiments, the electronic circuit also includes one or more of a distributed gate driver, a distributed gate pulldown device, a distributed diode, and a low resistance gate and/or source connection structure. An electronic component comprising the circuit, and methods of manufacturing the circuit are also disclosed.