Semiconductor Translation Feature for Waveguide Alignment
Solution Overview
Problem
Automotive radar systems in vehicles face performance limitations in detecting objects around the vehicle, necessitating improvements while maintaining cost-effectiveness.
Innovation Solution
A semiconductor device packaging solution featuring a translation feature formed on a metal layer, visible at the surface, which enables high-accuracy alignment of a waveguide structure by providing a known relative location and indicating encapsulant thickness and planarity, thereby enhancing the alignment and performance of the radar system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional packaging methods are used without translation features, then manufacturing process is simpler, but alignment precision of waveguide structure deteriorates
Solution Approach 1:
The translation feature is formed on the metal layer before waveguide structure alignment, establishing a known reference position in advance. This preliminary reference structure enables precise alignment of the waveguide structure without requiring complex real-time measurement systems during assembly.
Solution Approach 2:
The translation feature acts as an intermediary reference element between the packaging substrate and the waveguide structure. It provides a visible, measurable reference point that mediates the alignment process, allowing indirect but precise positioning of the waveguide structure relative to the launcher.
2Measurement precision
If translation feature is added to indicate encapsulant thickness and planarity, then quality control improves, but manufacturing complexity increases
Solution Approach 1:
The translation feature serves multiple functions simultaneously: it provides a reference for waveguide alignment, indicates encapsulant thickness, and monitors planarity. This multi-functionality eliminates the need for separate measurement features, reducing overall complexity while improving measurement precision.
Solution Approach 2:
The translation feature is made visible at the surface of the packaged assembly, allowing optical detection and measurement. The visible reference enables non-contact measurement of encapsulant thickness and planarity through surface profile analysis, enhancing measurement precision without physical contact.
3Reliability
If high accuracy alignment is achieved through translation feature, then radar system performance improves, but manufacturing cost increases
Solution Approach 1:
The translation feature is formed from the existing metal layer using the same manufacturing process, making it a self-generated reference structure. This self-service approach eliminates the need for separate, expensive alignment fixtures or external reference standards, reducing manufacturing cost while maintaining high accuracy.
Solution Approach 2:
The translation feature creates a simplified two-dimensional reference copy of the three-dimensional alignment requirements. By projecting the alignment geometry onto a visible surface feature, it enables precise alignment through simpler, less expensive measurement and positioning systems.
Data Source
AI summary
A semiconductor device is provided. The device includes a semiconductor die and a launcher structure attached to a package substrate. The launcher structure includes a launcher substrate, a launcher portion formed from a conductive layer at a major surface of the launcher substrate, and a translation pad formed from the conductive layer at the major surface. The translation pad is separate from the launcher portion. A translation feature is formed on the translation pad. The translation feature is configured for alignment of a waveguide structure.