RF Front-End Module Shielding for EMI and Overstress Protection
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Solution Overview
Problem
Existing radio frequency front end systems face challenges in efficiently integrating and shielding radio frequency components, particularly in compact systems, which can lead to electromagnetic interference and component damage from electrical overstress events.
Innovation Solution
A packaged module incorporating a low noise amplifier with negative feedback and a multi-mode power amplifier circuit, both integrated within a package with a radio frequency shielding structure, and an antenna external to the shielding. The module includes an overstress protection circuit to mitigate electrical overstress events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radio frequency components are integrated in compact systems, then device size is reduced, but electromagnetic interference between components increases
Solution Approach 1:
The patent divides the integrated circuit into multiple separate components (low noise amplifier, power amplifier, crystal oscillator) and places them in different locations within the package, with shielding structures positioned between them to segment electromagnetic fields and reduce interference
Solution Approach 2:
The patent introduces shielding structures as intermediary elements between radio frequency components to block electromagnetic interference, acting as a mediator that allows close integration while preventing harmful electromagnetic coupling
2Volume of moving object
If radio frequency components are integrated in compact systems, then device size is reduced, but susceptibility to electrical overstress increases
Solution Approach 1:
The patent incorporates overstress protection circuits that preemptively protect against electrical overstress events by detecting potential damage conditions and activating protection mechanisms before actual damage occurs to the radio frequency components
Solution Approach 2:
The patent implements protection circuits that act as a cushion against electrical overstress, absorbing or diverting excess energy before it can reach and damage the sensitive integrated circuit components
3Object-affected harmful factors
If shielding structures are added to protect radio frequency components, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated structures, such as integrating shielding with component packaging and combining protection circuits with signal processing circuits, thereby reducing overall structural complexity while maintaining electromagnetic interference protection
4Volume of moving object
If multiple radio frequency components are integrated in a single package, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent designs a universal package structure that can accommodate multiple different radio frequency components (amplifiers, oscillators, filters) using the same mounting and shielding architecture, thereby simplifying manufacturing processes despite the diversity of integrated 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
The solution effectively shields radio frequency components from electromagnetic interference, enhances the robustness of the system against electrical overstress, and improves the overall performance and reliability of the radio frequency front end system.
Implementation Method 1
a second inductor magnetically coupled to the first inductor to provide negative feedback to linearize the low noise amplifier
Implementation Method 2
A packaged module incorporating a low noise amplifier with negative feedback and a multi-mode power amplifier circuit, both integrated within a package with a radio frequency shielding structure
Data Source
AI summary
Front end systems and related devices, integrated circuits, modules, and methods are disclosed. One such front end system includes a low noise amplifier in a receive path and a multi-mode power amplifier circuit in a transmit path. The low noise amplifier includes a first inductor, an amplification circuit, and a second inductor magnetically coupled to the first inductor to provide negative feedback to linearize the low noise amplifier. The multi-mode power amplifier circuit includes a stacked output stage including a transistor stack of two or more transistors. The multi-mode power amplifier circuit also includes a bias circuit configured to control a bias of at least one transistor of the transistor stack based on a mode of the multi-mode power amplifier circuit. Other embodiments of front end systems are disclosed, along with related devices, integrated circuits, modules, methods, and components thereof.