Semiconductor Package Isolation Structure for Dual-Path Amplifiers
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Solution Overview
Problem
Dual-path amplifier semiconductor packages, such as Doherty power amplifiers, face performance degradation due to electromagnetic coupling between adjacent bond wire arrays of carrier and peaking amplifiers, which affects power efficiency and signal integrity.
Innovation Solution
Incorporating an isolation feature made of conductive material coupled to ground within the semiconductor package to separate the carrier and peaking amplifier elements, reducing electromagnetic coupling through air cavity or overmolded package designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If both carrier amplifier and peaking amplifier are placed in the same package to reduce space, then space efficiency is improved, but electromagnetic coupling between adjacent bond wire arrays increases causing performance degradation
Solution Approach 1:
The package is segmented into two separate regions: a first region for the carrier amplifier and a second region for the peaking amplifier. This spatial segmentation physically separates the bond wire arrays of the two amplifiers, reducing electromagnetic coupling while maintaining a compact single-package design. The segmentation allows each amplifier to have its own dedicated area with minimized interference.
Solution Approach 2:
A via structure acts as an intermediary element between the first and second regions. The via provides electrical connection between corresponding bond wire arrays while being positioned to minimize electromagnetic coupling. This intermediary structure enables signal transmission while maintaining isolation between the carrier and peaking amplifier circuits.
2Area of stationary object
If bond wire arrays of carrier and peaking amplifiers are placed in close proximity to save space, then space utilization is improved, but signal integrity deteriorates due to electromagnetic coupling
Solution Approach 1:
The signal paths are segmented into separate first and second regions corresponding to the carrier and peaking amplifiers. This segmentation creates physical separation between the bond wire arrays, reducing electromagnetic coupling and maintaining signal integrity while still utilizing compact packaging.
Solution Approach 2:
The via structure serves as an intermediary that connects signal paths between regions while minimizing harmful electromagnetic interactions. It provides the necessary electrical connection without allowing significant electromagnetic coupling between the closely spaced bond wire arrays.
3Device complexity
If amplifiers are placed adjacent to each other in a single package, then manufacturing complexity is reduced, but power efficiency decreases due to electromagnetic interference
Solution Approach 1:
The package structure is segmented into distinct first and second regions for the carrier and peaking amplifiers. This segmentation reduces electromagnetic interference between the amplifiers while maintaining a relatively simple single-package manufacturing process. The region separation minimizes power loss due to coupling without requiring complex multi-package assemblies.
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
Significantly improves signal isolation between amplifier elements, enhancing the performance of dual-path amplifiers by reducing both forward and reverse coupling, with operational frequency improvements exceeding 10 dB in test embodiments.
Implementation Method 1
The performance of a dual-path amplifier can be adversely perturbed, for example, by electromagnetic coupling (that is, the transfer of energy from one circuit component to another through a shared magnetic or electric field) between adjacent bond wire arrays of corresponding components of the amplifier.
Implementation Method 2
an electromagnetic isolation structure mounted on the flange and located between the first and second sets of conductors, wherein the electromagnetic isolation structure is electrically coupled to the flange by virtue of a conductive via or conductive adhesive, or to a ground external to the semiconductor device package
Data Source
AI summary
A single semiconductor device package that reduces electromagnetic coupling between elements of a semiconductor device embodied within the package is provided. For a dual-path amplifier, such as a Doherty power amplifier, an isolation feature that separates carrier amplifier elements from peaking amplifier elements is included within the semiconductor device package. The isolation feature can take the form of a structure that is constructed of a conductive material coupled to ground and which separates the elements of the amplifier. The isolation feature can be included in a variety of semiconductor packages, including air cavity packages and overmolded packages. Through the use of the isolation feature provided by embodiments of the present invention a significant improvement in signal isolation between amplifier elements is realized, thereby improving performance of the dual-path amplifier.