Half-Bridge GaN Transistor Layout With Common Electrode
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Solution Overview
Problem
Conventional GaN power transistors integrated on a single chip face inefficiencies in chip area reduction, leading to larger semiconductor device sizes.
Innovation Solution
An integrated semiconductor device is designed with a semiconductor substrate hosting a high-side transistor and a low-side transistor, where the source electrode of the high-side transistor and the drain electrode of the low-side transistor are integrated as a common electrode, reducing chip area and enhancing heat distribution homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional GaN power transistors are integrated on a single chip, then transistor integration is achieved, but chip area becomes larger than necessary
Solution Approach 1:
The source electrode of the high-side transistor and the drain electrode of the low-side transistor are merged into a single common electrode structure. This merging eliminates the need for separate electrodes and reduces the overall chip area required for the half-bridge configuration, directly resolving the technical contradiction between achieving transistor integration and minimizing chip area.
Solution Approach 2:
The common electrode serves dual functions: it acts as the source electrode for the high-side transistor and simultaneously serves as the drain electrode for the low-side transistor. This multi-functionality reduces the number of separate components needed, thereby reducing chip area while maintaining full transistor integration capability.
2Reliability
If separate electrode structures are used for high-side and low-side transistors, then electrode functionality is ensured, but heat distribution becomes inhomogeneous
Solution Approach 1:
By merging the source electrode of the high-side transistor and the drain electrode of the low-side transistor into a single common electrode, the heat generation points are consolidated. This allows for more uniform heat distribution across the chip, improving thermal management while maintaining the electrical functionality of both transistors.
3Adaptability or versatility
If conventional integration methods are used, then half-bridge configuration is achieved, but flow-through currents occur
Solution Approach 1:
The merged common electrode structure physically prevents flow-through currents by eliminating the separate electrode paths that would allow such currents to occur. The single common electrode structure ensures that current must flow through the intended transistor channels rather than taking shortcuts between electrodes, thereby maintaining proper half-bridge configuration while eliminating harmful flow-through currents.
Data Source
AI summary
An integrated semiconductor device includes an Si substrate, and a high-side transistor and a low-side transistor which configure a half-bridge. A source electrode of a unit transistor configuring the high-side transistor and a drain electrode of a unit transistor configuring the low-side transistor are integrated as a common electrode.