Equal-Height Pogo Pins for Semiconductor Package Testing
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Solution Overview
Problem
Existing testing systems for semiconductor package units, particularly in package-on-package devices, are unable to perform effective functional tests due to pogo pins of varying lengths, which hinder the ability to accurately assess the continuity and functionality of semiconductor package units.
Innovation Solution
The use of electrically conductive pogo pins of substantially equal height on both the top and bottom printed circuit boards to establish consistent electrical coupling with the semiconductor package unit, allowing for the transmission of test signals and enabling both continuity and functional tests, such as measuring access time, by bridging adjacent pogo pins with an electrically conductive path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pogo pins of varying lengths are used in existing testing systems, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision and reliability of functional tests deteriorate
Solution Approach 1:
The patent applies parameter changes by standardizing the length of all pogo pins to be substantially equal, transforming the variable parameter (pogo pin length) into a fixed parameter. This ensures consistent electrical coupling and accurate signal transmission for reliable functional testing of semiconductor package units.
Solution Approach 2:
The patent implements equipotentiality by ensuring all pogo pins have substantially equal height, creating uniform electrical contact conditions across all test points. This eliminates potential differences and signal variations caused by varying contact lengths, thereby improving measurement precision.
2Reliability
If pogo pins of varying lengths are used in existing testing systems, then the ease of manufacture is improved, but the reliability of functional tests deteriorates
Solution Approach 1:
The patent changes the parameter of pogo pin length from variable to fixed (substantially equal), which improves reliability by ensuring consistent electrical coupling. While this may slightly increase manufacturing complexity compared to varying lengths, it ensures uniform contact quality and test reliability.
3Adaptability or versatility
If adjacent pogo pins are bridged using an electrically conductive path, then the functionality of continuity and functional tests is enabled, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the testing system with bridged adjacent pogo pins that can perform multiple test functions (continuity testing, functional testing, signal transmission) through a single integrated configuration, thereby enabling versatile testing capabilities.
Solution Approach 2:
The patent merges the functionality of multiple test operations into a single integrated system where bridged pogo pins simultaneously handle signal transmission, continuity testing, and functional testing, reducing the need for separate test configurations.
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
This solution enables reliable continuity and functional testing of semiconductor package units, ensuring accurate assessment of their performance and functionality, particularly in package-on-package semiconductor devices, by ensuring consistent electrical coupling and signal transmission.
Implementation Method 1
transmitting test signals from the bottom printed circuit board to the semiconductor device package by way of the bottom-side pogo pins
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The present invention refers among other aspects to methods and systems for testing a semiconductor package unit (150,420) by electrically coupling a top printed circuit board (208,420) to a top-side of a semiconductor package unit (150,420), the coupling using electrically conductive top-side pogo pins (201A,420), and a pair of adjacent top-side pogo pins (201A,420) bridged using an electrically conductive path (302,420), electrically coupling a bottom printed circuit board (210,430) to a bottom-side of the semiconductor package unit (150,430), the coupling using electrically conductive bottom-side pogo pins (201B,430), said top-side pogo pins (201A,430) and said bottom-side pogo pins are of substantially equal height (201B,430), and transmitting test signals from the bottom printed circuit board to the semiconductor device package by way of the bottom-side pogo pins (210,440).