Gate Extension Finger Layout for Low-Resistance RF Power 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, where conductive contacts are spaced apart to span a majority of the finger length, providing an alternative current path and reducing 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 discrete contact regions along its length. Instead of a single continuous contact, multiple segmented contacts are distributed along the finger, reducing the effective resistance by providing multiple parallel current paths while maintaining the extended length for power handling.
Solution Approach 2:
The contact structure transitions from a single-plane contact to a multi-dimensional arrangement where contacts are distributed along the length of the gate extension finger. This spatial distribution in the longitudinal dimension creates multiple current paths that reduce resistance without requiring increased contact area in the transverse dimension.
2Reliability
If gate extension finger length is extended beyond active area, then alternative current path is provided reducing resistance, but device complexity increases
Solution Approach 1:
The gate extension finger structure serves multiple functions simultaneously: it extends beyond the active area to provide mechanical support and stress relief, while also hosting multiple discrete contacts that create alternative current paths. This multi-functionality reduces resistance without requiring separate dedicated structures, thereby limiting complexity increase.
Solution Approach 2:
The patent combines the gate extension finger with the contact structure by integrating multiple contacts directly onto the extended finger. This merging of functions eliminates the need for separate contact structures and simplifies the overall device architecture while achieving the resistance reduction goal.
Data Source
AI summary
The present disclosure relates an integrated chip. The integrated chip includes an isolation region disposed within a substrate and surrounding an active area. A gate structure is disposed over the substrate and has a base region and a gate extension finger protruding outward from a sidewall of the base region along a first direction to past opposing sides of the active area. A source contact and a drain contact are disposed within the active area. The drain contact is separated from the source contact by the gate extension finger. A first plurality of conductive contacts are arranged on the gate structure. The first plurality of conductive contacts are separated along the first direction by distances overlying the gate extension finger.