Lateral PNP Emitter Ring Layout for Higher Current Density
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Solution Overview
Problem
Lateral bipolar transistors face challenges in scaling current handling capabilities while maintaining the emitter perimeter to area ratio, leading to increased silicon area consumption and cost due to the need for multiple units and significant spacing between emitter and collector regions.
Innovation Solution
The solution involves integrating multiple emitter regions within a collector ring structure, where the collector region surrounds each emitter to minimize spacing and maintain the emitter perimeter to area ratio, allowing for closer emitter placement and reduced silicon area usage, while maintaining a circular emitter layout to maximize current gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple separate bipolar transistor units are used to increase current handling capability, then the current handling capability is improved, but the silicon area consumption increases significantly
Solution Approach 1:
The patent combines multiple emitter regions and collector regions into a single integrated structure where multiple emitters share a common collector. This merging approach allows multiple transistor functions to coexist in a reduced area compared to discrete units, directly addressing the silicon area consumption problem while maintaining enhanced current handling capability.
Solution Approach 2:
The patent implements a nested configuration where multiple emitter regions are positioned within the area bounded by a single collector region. This nesting arrangement enables compact packing of multiple active regions, reducing the overall silicon footprint while preserving the current handling benefits of having multiple emitters.
2Power
If multiple bipolar transistor units are used to increase current handling capability, then the current handling capability is improved, but the device complexity increases
Solution Approach 1:
By merging multiple emitter and collector regions into a shared structure, the patent reduces the number of independent transistor units that would otherwise need to be managed separately. This consolidation simplifies the overall device architecture, reducing interconnection complexity and fabrication steps while achieving the desired current handling enhancement.
3Reliability
If significant spacing is maintained between emitter and collector regions, then the transistor performance is maintained, but the silicon area consumption increases
Solution Approach 1:
The patent applies local quality by maintaining appropriate spacing between individual emitter regions and the collector in critical areas where performance is sensitive, while allowing closer packing in regions where performance impact is minimal. This selective spacing approach preserves transistor performance characteristics while minimizing overall silicon area consumption through optimized regional density.
Data Source
AI summary
A semiconductor device is described herein. The semiconductor device includes a substrate and a collector region in the substrate. The semiconductor device also includes a plurality of emitter regions in the substrate, each of the plurality emitter regions separate from each other, wherein the plurality of emitter regions is disposed in an area bounded by the collector region.