Single-Active-Area ESD Layout for Low-Voltage Semiconductor Protection
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Solution Overview
Problem
Existing semiconductor devices with multiple-active-area (MAA) ESD protection devices face challenges such as increased die area and manufacturing cost due to large separation distances between collector and emitter regions, leading to low gain and operational issues at low voltages.
Innovation Solution
The implementation of single-active-area (SAA) ESD protection devices, where collector and emitter regions are located in the same active area, reduces the isolation structure size and die area usage, allowing for more flexible placement and improved performance compared to MAA devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple-active-area (MAA) ESD protection devices are used, then ESD protection functionality is provided, but die area increases and manufacturing cost increases due to large separation distances between collector and emitter regions
Solution Approach 1:
The patent merges the collector and emitter regions into a single active area, eliminating the need for separate active areas and the large isolation structures between them. This consolidation reduces the overall die area while maintaining ESD protection functionality through the bipolar transistor structure formed within the shared active area.
Solution Approach 2:
The patent transitions from a planar separation of collector and emitter in different active areas to a vertical/dimensional arrangement where both regions coexist in the same active area plane. This allows the bipolar transistor to function with reduced lateral separation, achieving compact layout without sacrificing ESD protection capability.
2Reliability
If multiple-active-area (MAA) ESD protection devices are used, then ESD protection functionality is provided, but manufacturing cost increases due to large separation distances between collector and emitter regions
Solution Approach 1:
By combining collector and emitter regions in a single active area, the patent reduces the total isolation structure footprint and simplifies the manufacturing process. This merger decreases the number of fabrication steps required for patterning and isolating separate active areas, thereby reducing manufacturing cost while preserving ESD protection functionality.
Solution Approach 2:
The patent changes the spatial parameter of region separation from large lateral distances in MAA devices to minimal separation in SAA devices. This parameter change optimizes the manufacturing process by reducing the complexity of alignment and isolation formation, leading to lower manufacturing costs.
3Reliability
If large separation distances are used between collector and emitter regions, then isolation is achieved, but gain decreases and low voltage operation becomes problematic
Solution Approach 1:
The patent applies local quality by providing isolation only where necessary within the single active area, rather than requiring complete spatial separation. The bipolar transistor structure achieves regional isolation between collector and emitter through localized doping profiles and junction formation, maintaining sufficient electrical isolation while enabling close proximity for high gain and low voltage operation.
Solution Approach 2:
The patent optimizes the separation distance parameter between collector and emitter regions by reducing it from large values in MAA devices to minimal values in SAA devices. This parameter optimization enhances the bipolar transistor gain and enables low voltage operation while maintaining adequate isolation through controlled doping and junction design.
Data Source
AI summary
A semiconductor device includes a substrate. The semiconductor device further includes a doped region in the substrate. The semiconductor device further includes an active area, and wherein the active area comprises an emitter region and a collector region, wherein the emitter region is electrically connected to the doped region. The semiconductor device further includes a deep trench isolation (DTI) structure extending through the active area and between the emitter region and the collector region.