Conductive Isolation Wall for Semiconductor Package Crosstalk Reduction
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Solution Overview
Problem
Current Doherty power amplifier semiconductor package designs face challenges in miniaturization due to the need to maintain spatial distance between carrier and peaking amplifiers to reduce crosstalk, which limits the potential for low cost, low weight, and small volume semiconductor packages.
Innovation Solution
Incorporating an isolation wall made of conductive material between the carrier and peaking amplifiers to provide electrical isolation and reduce inductive coupling, which can be formed on the ground plane or as part of the lead frame, and connected to ground to prevent electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spatial distance is maintained between carrier and peaking amplifiers to reduce crosstalk, then electromagnetic coupling is reduced, but package volume increases
Solution Approach 1:
A ground plane is introduced as an intermediary structure between the carrier amplifier and peaking amplifier. This ground plane acts as a shield that redirects electromagnetic fields, preventing direct coupling between the amplifiers while allowing them to be positioned closer together, thus reducing package volume without sacrificing electromagnetic isolation
Solution Approach 2:
The isolation mechanism transitions from spatial separation (one-dimensional distance) to a two-dimensional ground plane structure. By utilizing the ground plane as an active isolation element, the design achieves electromagnetic isolation without requiring proportional increases in linear dimensions, enabling compact three-dimensional packaging
2Object-affected harmful factors
If spatial distance is maintained between carrier and peaking amplifiers to reduce crosstalk, then electromagnetic coupling is reduced, but package weight increases
Solution Approach 1:
The ground plane serves as a lightweight intermediary that provides electromagnetic isolation without requiring heavy shielding materials. By utilizing the existing ground plane structure in the semiconductor package, isolation is achieved without adding significant weight, unlike traditional Faraday cage approaches
3Object-affected harmful factors
If spatial distance is maintained between carrier and peaking amplifiers to reduce crosstalk, then electromagnetic coupling is reduced, but manufacturing complexity increases
Solution Approach 1:
The ground plane is designed to serve multiple functions simultaneously: it provides the reference potential for amplifier operation, serves as a thermal management pathway, and acts as an electromagnetic isolation shield. This multi-functionality eliminates the need for separate isolation structures, simplifying the overall package design and reducing manufacturing 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 isolation wall effectively reduces inductive coupling and electromagnetic interference, allowing for a more compact semiconductor package design that maintains high power-added efficiency while meeting the requirements of low cost, low weight, and small volume.
Implementation Method 1
reduces inductive coupling
Implementation Method 2
prevent electromagnetic interference
Data Source
AI summary
A system and method for packaging a semiconductor device that includes a wall to reduce electromagnetic coupling is presented. A semiconductor device has a substrate on which a first circuit and a second circuit are formed proximate to each other. An isolation wall of electrically conductive material is located between the first circuit and the second circuit, the isolation wall being configured to reduce inductive coupling between the first and second circuits during an operation of the semiconductor device. Several types of isolation walls are presented.