Interior-Fed Gate Fingers for High Power Transistors
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Solution Overview
Problem
High power, high frequency transistors face challenges in maintaining performance due to increased gate finger width, which leads to higher resistance and phase differences in signal propagation, degrading output power and efficiency.
Innovation Solution
The solution involves dividing gate fingers into segments by connecting gate runners to gate interconnects at interior positions, reducing phase differences and maintaining shorter finger lengths while achieving higher output power, by using conductive vias to distribute the gate signal with minimal phase shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gate fingers are made wider to increase output power, then power handling capability is improved, but phase differences in signal propagation increase and high frequency performance deteriorates
Solution Approach 1:
The gate interconnect is divided into multiple segments by introducing gate runners that connect to interior positions of the gate interconnect. This segmentation allows the gate signal to be distributed to multiple points along the gate finger, reducing the effective signal path length and minimizing phase differences across the wide gate structure, thereby maintaining high frequency performance while achieving increased output power through wider gate fingers.
2Power
If gate fingers are made wider to increase effective gate periphery, then power handling capability is improved, but resistance increases and signal propagation degrades
Solution Approach 1:
Gate runners are introduced as intermediary conductive elements that connect to interior positions of the gate interconnect via conductive vias. These runners act as mediators to distribute the gate signal to multiple points along the gate finger, effectively reducing the resistance and signal propagation issues that would otherwise result from making the gate fingers wider for increased power handling capability.
3Power
If gate fingers are made wider to handle increased current levels, then output power is improved, but electromigration of gate finger metallization increases
Solution Approach 1:
By segmenting the gate interconnect through interior-fed gate runners, the current distribution along the wide gate finger is improved. The multiple connection points created by the gate runners reduce the current density in any single section of the gate finger metallization, thereby reducing electromigration effects and improving reliability while maintaining the wide gate structure needed for high output power.
Data Source
AI summary
A transistor device includes a semiconductor structure, a plurality of gate fingers extending on the semiconductor structure in a first direction, a plurality of gate interconnects that each have a first end and a second end extending on the semiconductor structure in the first direction, wherein each gate interconnect is connected to a respective gate finger by a plurality of first conductive vias, and a plurality of gate runners extending on the semiconductor structure in the first direction. At least one gate interconnect of the gate interconnects is connected to one of the gate runners by a second conductive via at an interior position of the at least one gate interconnect that is remote from the first end and the second end of the at least one gate interconnect.