Shielding TSVs for RFIC Interference Isolation
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Solution Overview
Problem
Existing radio-frequency integrated circuits (RFICs) face challenges in protecting sensitive circuits from neighboring radio- and electromagnetic interference (RMI) due to the lack of effective shielding mechanisms, which can lead to noise interference and signal degradation.
Innovation Solution
The implementation of through-silicon via (TSV) radio-frequency integrated circuits (RFICs) with shielding TSVs forming a 3D radio- and electromagnetic interference shield around sensitive sectors, such as GPS circuitry, using a combination of shielding TSVs and backside shields to create an enclosure that extends into the back-end metallization, thereby reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If through-silicon via shielding structures are implemented, then electromagnetic interference shielding is improved, but device complexity increases
Solution Approach 1:
The shielding structure is segmented into multiple through-silicon via regions that divide the die into distinct shielded sectors. Each sector can be independently shielded, allowing selective protection of sensitive circuits while maintaining functionality in other areas. This segmentation approach provides effective electromagnetic shielding without requiring complete enclosure of the entire device.
Solution Approach 2:
The patent transitions from planar shielding approaches to three-dimensional through-silicon via structures that extend vertically through the entire die thickness. This dimensional change creates enclosed sectors by utilizing the vertical dimension, forming shielded regions that block electromagnetic interference paths without requiring additional lateral space.
2Reliability
If shielded sectors are created using through-silicon vias, then signal integrity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shielding function is merged with the existing through-silicon via fabrication process used for electrical interconnects. By combining the shielding via formation with standard TSV processing steps, the patent achieves electromagnetic shielding without requiring separate manufacturing operations, thereby reducing the impact on manufacturing precision requirements.
Solution Approach 2:
The through-silicon via structures serve dual functions: providing both electrical interconnect pathways and electromagnetic shielding. This multi-functionality allows the same structural elements to address both signal transmission and interference protection, reducing the need for additional precision-critical components.
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
This solution effectively shields sensitive RF circuits from RMI, enhancing signal integrity and reducing noise interference, allowing for improved performance in multi-functional RFICs by isolating different RF capabilities within the same die.
Implementation Method 1
through-silicon via (TSV) radio-frequency integrated circuits (RFICs) with shielding TSVs forming a 3D radio- and electromagnetic interference shield around sensitive sectors
Data Source
Figure 1a~2
Figure 1b
Figure 1c
AI summary
An apparatus includes a radio-frequency die with shielding through-silicon vias and a die backside lattice lid that shield a sector in the RF die from radio - and electromagnetic interference.