Noise Decoupling Structure Using TSVs and Guard Rings
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Solution Overview
Problem
High-frequency RF devices in 3D structures suffer from severe noise coupling, which limits the performance of analog circuits like differential amplifiers, necessitating effective noise isolation structures.
Innovation Solution
A noise decoupling structure incorporating a deep n-well region, guard rings, through-substrate vias (TSVs), and a metal plate on the backside of the substrate, where TSVs are electrically coupled to the metal plate and guard rings to prevent noise coupling by collecting leaked electrons, particularly in 3D structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency RF devices are integrated in a 3D structure, then device integration density is improved, but noise coupling between devices increases
Solution Approach 1:
The substrate is divided into multiple regions with different ground potentials using guard rings and deep n-well regions. This segmentation creates isolated noise zones that prevent noise propagation between high-frequency RF devices while maintaining their 3D integration density.
Solution Approach 2:
Through-substrate vias (TSVs) filled with conductive material serve as intermediary noise shielding structures. These TSVs are strategically positioned between noisy digital circuits and sensitive analog circuits, acting as noise barriers that block electromagnetic interference while allowing signal transmission through the substrate.
2Reliability
If noise isolation structures are added to prevent noise coupling, then signal integrity is improved, but device complexity increases
Solution Approach 1:
Multiple noise isolation functions are merged into a single integrated structure. The deep n-well region, guard rings, and TSVs are combined to form a unified noise decoupling system that simultaneously provides electrical isolation, electromagnetic shielding, and noise filtering without requiring separate isolation components.
Solution Approach 2:
The guard ring structure serves multiple functions: it acts as an electrical isolation barrier, provides a reference potential plane, and functions as part of the noise shielding system. This multi-functionality reduces the need for additional dedicated noise isolation components, thereby limiting complexity increase.
3Object-affected harmful factors
If deep n-well regions and guard rings are used for noise isolation, then noise coupling is reduced, but manufacturing complexity increases
Solution Approach 1:
The deep n-well regions and guard rings are formed during the preliminary substrate preparation stage, before the main device fabrication process. This preliminary action allows noise isolation structures to be integrated into the substrate without requiring additional processing steps after device fabrication, thereby limiting manufacturing complexity increase.
Solution Approach 2:
The guard ring structure is nested within the substrate and integrated with the deep n-well regions. The TSVs are positioned to align with and complement the guard ring structure, creating a nested configuration that maximizes noise isolation effectiveness while minimizing the number of discrete manufacturing operations required.
Data Source
AI summary
A device includes a substrate having a front surface and a back surface; an integrated circuit device at the front surface of the substrate; and a metal plate on the back surface of the substrate, wherein the metal plate overlaps substantially an entirety of the integrated circuit device. A guard ring extends into the substrate and encircles the integrated circuit device. The guard ring is formed of a conductive material. A through substrate via (TSV) penetrates through the substrate and electrically couples to the metal plate.