Intra-package Interference Isolation via Distributed Grounding
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Solution Overview
Problem
Electromagnetic interference between components and device packages mounted on printed circuit boards poses a significant challenge, particularly for high-power and high-frequency applications, where existing shielding methods may not adequately prevent electromagnetic radiation from causing ripple voltages and device failures.
Innovation Solution
The implementation of a device package with a ground pad, a high-frequency, high-power semiconductor device secured to a substrate with a metal via and trace, and bonding wires that electrically couple the top metal layer of the integrated circuit device die to the ground pad, creating a Faraday cage-like structure for electromagnetic isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional shielding methods are used for high-power and high-frequency components, then electromagnetic radiation can be partially blocked, but ripple voltages still occur and device failures happen due to inadequate shielding effectiveness
Solution Approach 1:
The patent segments the electromagnetic shielding function into multiple distributed ground connections rather than relying on a single continuous shield. Multiple ground pads are created across the substrate, each providing localized reference potential and interference drainage paths, thereby segmenting the harmful electromagnetic energy into manageable portions that can be independently controlled and dissipated.
Solution Approach 2:
The patent introduces an intermediary grounding system consisting of multiple ground pads connected through the substrate to a common ground reference. This intermediary network acts as a mediator between the high-frequency signals and the final ground reference, providing controlled impedance paths that safely channel electromagnetic interference away from sensitive circuit elements without causing voltage ripple.
2Object-affected harmful factors
If continuous electromagnetic shielding is implemented, then electromagnetic radiation is blocked, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the essential shielding function from the concept of a continuous physical barrier and isolates only the critical ground reference points needed for electromagnetic control. Instead of implementing a complete enclosing shield, the invention extracts and distributes discrete ground pads at strategically located positions, maintaining electromagnetic integrity while eliminating unnecessary structural complexity.
Solution Approach 2:
The patent applies local quality by providing electromagnetic reference and drainage only at specific locations where high-frequency signals are generated or routed, rather than uniformly across the entire device. Ground pads are strategically placed near power amplifiers, mixers, and other high-frequency components, creating localized zones of electromagnetic control that are sufficient for the actual interference sources without requiring global shielding.
3Object-affected harmful factors
If multiple ground connections are distributed across the substrate, then electromagnetic interference is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent creates ground pads that serve multiple functions simultaneously: they provide local reference potential for high-frequency circuits, act as interference drainage points, establish controlled impedance transmission paths, and serve as mechanical anchor points for component mounting. This multi-functionality reduces the need for additional specialized structures, thereby lowering overall manufacturing precision requirements despite the distributed nature of the ground system.
Solution Approach 2:
The patent merges the electromagnetic grounding function with the existing substrate structure and component mounting architecture. Ground pads are integrated into the same manufacturing process as other circuit elements, and their positioning is coordinated with component footprints and signal routing, combining multiple functions into a unified structure that reduces the number of separate precision-critical features.
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 configuration effectively reduces electromagnetic interference by capturing and isolating high-frequency electromagnetic energy, preventing ripple voltages and ensuring the functionality and reliability of the integrated circuit device die, while also providing a structural arrangement similar to a Faraday cage for shielding.
Implementation Method 1
The top metal layer of the integrated circuit device die and the metal trace and via of the substrate help to shield electromagnetic radiation between the high-frequency, high-power semiconductor device(s) and the integrated circuit device die in the device package
Implementation Method 2
a number of ground pad bonding wires that electrically couple the top metal layer of the integrated circuit device die and the metal trace to the ground pad
Data Source
AI summary
In one example, a device having integrated package interference isolation includes a ground pad, an integrated circuit device die secured to the ground pad, a substrate secured to the ground pad, at least one a high-frequency, high-power semiconductor device secured to a top mounting surface of the substrate. For electromagnetic isolation, the integrated circuit device die includes a top metal, and the substrate includes a metal via electrically coupled to a metal trace that extends on the top mounting surface of the substrate. The device package also includes a number of ground pad bonding wires that electrically couple the redistribution layer of the integrated circuit device die and the metal trace to the ground pad. The redistribution layer of the integrated circuit device die and the metal trace and via of the substrate help to shield electromagnetic radiation between components in the device package.