Integrated HEMT Package Structure With Built-In Gate Overvoltage Protection
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Solution Overview
Problem
Conventional enhancement-mode high electron mobility transistors (HEMTs) are prone to damage when exposed to driving voltages outside their operational range due to the need for additional protection circuits, which increase circuit complexity and area.
Innovation Solution
Integrating the transistor and protection circuit in a single package structure reduces parasitic inductance by shortening distances between components, thereby enhancing durability and reducing circuit area, complexity, and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional protection circuit is disposed between the E-Mode HEMT and the driving voltage, then the durability of the E-Mode HEMT is improved, but the circuit area and complexity increase
Solution Approach 1:
The patent combines the protection circuit (comprising resistor, capacitor, and Zener diodes) and the E-Mode HEMT into a single integrated package structure. This merging eliminates the need for separate mounting of protection components on the circuit board, thereby reducing overall circuit complexity while maintaining the protection function.
Solution Approach 2:
The integrated package structure serves multiple functions simultaneously: it provides voltage protection through the protection circuit, houses the power switch transistor, and reduces parasitic inductance through compact internal routing. This multi-functionality addresses both durability and complexity concerns.
2Reliability
If an additional protection circuit is disposed between the E-Mode HEMT and the driving voltage, then the durability of the E-Mode HEMT is improved, but the circuit area increases
Solution Approach 1:
The protection circuit components (resistor, capacitor, Zener diodes) and the E-Mode HEMT are merged into a single integrated package, dramatically reducing the total circuit area required compared to separate mounting of all components on the PCB.
Solution Approach 2:
The package structure nests multiple components (protection circuit elements and transistor) within a single封装 body, with internal connections that minimize external footprint. The protection circuit is effectively nested around the transistor gate terminal.
3Reliability
If the distances among the gate of the transistor and the resistor, capacitor, and Zener diodes are shortened, then the parasitic inductance is reduced and durability is improved, but the manufacturing complexity increases
Solution Approach 1:
By merging all protection components and the transistor into a single integrated package, the patent achieves extremely short internal connection distances that minimize parasitic inductance. The manufacturing complexity is managed through standardized package fabrication processes.
Solution Approach 2:
The integrated package structure acts as an intermediary that pre-assembles and pre-optimizes the internal connections between components. This mediator handles the manufacturing complexity internally, presenting a simple two-terminal device to the end user.
4Area of stationary object
If the transistor and protection circuit are integrated in the same package, then the circuit area is reduced and heat dissipation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The integration of all components into a single package reduces the circuit board footprint significantly. The manufacturing precision challenges are shifted to the package fabrication stage, where precision is built-in during manufacturing rather than during PCB assembly.
Solution Approach 2:
The integrated package is designed as a self-contained module that requires minimal external assembly. The internal connections and component placements are predetermined during package manufacturing, reducing the precision requirements for external mounting operations.
Data Source
AI summary
A package structure is provided herein, which includes a substrate, an integrated transistor, and an encapsulation structure. The integrated transistor is disposed on the substrate and includes a transistor, a capacitor, a resistor, a first Zener diode, and a second Zener diode. The transistor includes a gate, a drain, and a source. The capacitor is electrically connected to the gate, and the resistor is electrically connected to the gate. The first Zener diode includes a first anode and a first cathode electrically connected to the gate. The second Zener diode includes a second anode electrically connected to the first anode and a second cathode electrically connected to the source. The encapsulation structure encapsulates the integrated transistor. The package structure includes a gate terminal, a drain terminal, and a source terminal.