Conductive Isolation Structure for Semiconductor Package Crosstalk Reduction
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Solution Overview
Problem
The existing Doherty power amplifier semiconductor package design faces challenges in miniaturization due to the need to maintain spatial distance between carrier and peaking amplifiers to limit crosstalk, which restricts the potential for low cost, low weight, and small volume semiconductor packages.
Innovation Solution
An electrically conductive isolation structure is formed between the carrier and peaking amplifiers to provide electrical isolation, reducing inductive coupling and electromagnetic interference, thereby allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If discrete devices are maintained a distance apart in the package, then crosstalk between carrier and peaking amplifiers is limited, but the semiconductor 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 two amplifiers while allowing them to be placed in close proximity, thus reducing package volume without increasing crosstalk
Solution Approach 2:
The package interior is segmented into distinct regions by the ground plane, creating separate electromagnetic zones for the carrier amplifier and peaking amplifier. This segmentation allows the amplifiers to be positioned closer together while maintaining electromagnetic isolation, resolving the contradiction between compactness and crosstalk reduction
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 structure effectively mitigates inductive signal coupling, enhancing the performance of the circuitry and enabling the miniaturization of semiconductor packages while maintaining high power-added efficiency.
Implementation Method 1
an isolation structure formed of electrically conductive material located between the carrier amplifier and the peaking amplifier. The isolation structure is configured to reduce electromagnetic coupling between the carrier amplifier and the peaking amplifier
Implementation Method 2
reducing inductive coupling and electromagnetic interference
Data Source
AI summary
A system and method for packaging a semiconductor device that includes a structure to reduce electromagnetic coupling is presented. The semiconductor device has a substrate on which a first circuit and a second circuit with inputs and outputs are formed proximate to each other. An isolation structure of electrically conductive material is located between components of the first and second circuits, the isolation structure being configured to reduce inductive coupling between those components during an operation of the semiconductor device. The isolation structure may be positioned on or over exterior surfaces of the semiconductor device housing or inside the housing. In one embodiment, the isolation structure includes a first leg extending transverse to the surface of the substrate and a first cross member connected to and projecting from the first leg over the substrate.