E-Fuse Cells Integrated with Bipolar Device Emitter
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Solution Overview
Problem
Electronic fuse (e-fuse) cells integrated with bipolar devices face challenges such as footprint issues and the need for a CMOS programming current source in BiCMOS technology, which affects their efficiency and reliability.
Innovation Solution
A bipolar device structure with an e-fuse integrated into the emitter region, featuring a silicided polysilicon material with a central region narrower than end regions, allowing for area savings and lower leakage current, and utilizing interconnects for programming and sensing, fabricated using IC technology processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If e-fuse cells are integrated with bipolar devices, then area is reduced, but footprint challenges persist
Solution Approach 1:
The e-fuse cell is merged with the bipolar device structure, where the e-fuse extends from the emitter region of the bipolar transistor. This integration combines two previously separate components into a single unified structure, reducing the total area occupied while maintaining both e-fuse and bipolar device functionality.
Solution Approach 2:
The integrated structure serves multiple functions: the bipolar device provides amplification or switching functionality while the integrated e-fuse provides programmable fuse functionality. This multi-functionality eliminates the need for separate dedicated e-fuse structures, thereby reducing footprint challenges.
2Reliability
If e-fuse uses weak traces designed to fail, then e-fuse functionality is achieved, but reliability of other circuits is at risk
Solution Approach 1:
The e-fuse trace is designed with locally varied properties: a narrow central region with lower cross-section that is intentionally made weaker to fail first, while the end regions maintain sufficient strength and width to support normal circuit operation. This local quality differentiation ensures e-fuse functionality without compromising other circuits.
3Area of stationary object
If e-fuse is integrated with bipolar device, then area is reduced, but device complexity increases
Solution Approach 1:
The emitter region of the bipolar device is segmented into distinct functional zones: a central silicided region that forms the e-fuse trace and end regions that serve as normal emitter contacts. This segmentation allows the e-fuse functionality to be integrated without requiring a completely new device architecture, thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integrated e-fuse cell achieves significant area reductions and supports higher current than conventional FETs while maintaining lower leakage current, enhancing the dynamic reprogramming capabilities of semiconductor chips.
Implementation Method 1
They work (blow) by electromigration, i.e., the phenomenon that electric flow causes the conductor material to move and blow the fuse
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to electronic fuse (e-fuse) cells integrated with a bipolar device and methods of manufacture. The structure includes: a bipolar device comprising a collector region, a base region and an emitter region; and an e-fuse integrated with and extending from the emitter region of the bipolar device.