Gate Extension Layout for Low-Resistance High-Power RF Transistors
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Solution Overview
Problem
High power transistor devices face challenges in achieving high output power while maintaining low gate resistance, as increasing gate extension finger length leads to increased resistance, degrading RF performance.
Innovation Solution
The transistor device is configured with a gate structure that includes gate extension fingers protruding beyond the active area, spaced conductive contacts spanning the majority of the finger length, and multiple interconnect layers to provide an alternative current path, reducing gate resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gate extension finger length is increased to handle high power, then power handling capability is improved, but gate resistance increases degrading RF performance
Solution Approach 1:
The gate extension finger is divided into multiple segments with conductive contacts at different locations along its length. This segmentation creates multiple parallel current paths, reducing the overall gate resistance while maintaining the extended finger structure needed for high power handling.
Solution Approach 2:
Multiple conductive contacts are positioned at different locations along the gate extension finger length, adding a dimensional aspect to the current path. This creates parallel conduction paths that reduce resistance without requiring the finger to be shorter.
2Power
If gate extension finger length is increased, then output power is improved, but gate resistance increases
Solution Approach 1:
The gate extension finger structure is segmented with multiple conductive contacts placed along its length, creating multiple parallel current paths. This reduces the effective resistance of the gate extension while preserving the extended length needed for high output power capability.
Solution Approach 2:
The resistance parameter of the gate extension finger is changed by introducing multiple conductive contacts that create parallel conduction paths. This alters the electrical characteristics to reduce resistance while maintaining the mechanical and electrical function of the extended gate structure.
3Reliability
If multiple conductive contacts are added along gate extension finger, then gate resistance is reduced, but device complexity increases
Solution Approach 1:
Multiple conductive contacts are merged with the gate extension finger structure, where the contacts are integrated along the finger length. This combining approach reduces resistance while the overall structure remains a unified gate component, minimizing the increase in device complexity.
Data Source
AI summary
The present disclosure relates to an integrated chip. The integrated chip includes an isolation region within a substrate and surrounding an active area. A gate structure has a base region and a plurality of gate extensions protruding outward from a sidewall of the base region along a first direction to within the active area. One or more source contacts are arranged within the active area. One or more drain contacts are arranged within the active area. The plurality of gate extensions are between the one or more source contacts and the one or more drain contacts along a second direction that is perpendicular to the first direction. A plurality of gate contacts are arranged within the active area and on the plurality of gate extensions. A first interconnect has a lower surface extending along a line to contact two or more of the plurality of gate contacts.