Socketless QFN Test Board with Toggle Pogo Pin Mechanism
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Solution Overview
Problem
Existing test fixtures for QFN devices face challenges in achieving accurate and non-destructive testing due to parasitic losses and the need for calibration and correlation testing, especially in RF applications.
Innovation Solution
A socketless or flush-mount test apparatus using a toggle member and pogo pins to apply controlled pressure for a flushmount electrical contact between the QFN device and the test board, minimizing parasitic losses and allowing for non-destructive testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a socketed test fixture is used for QFN devices, then the device can be tested without direct soldering, but parasitic losses increase and calibration/correlation testing is required
Solution Approach 1:
The patent removes the socket component entirely from the test fixture, extracting the source of parasitic losses. The QFN device is tested in a socketless configuration where the device contacts the test board directly through soldering, eliminating the intermediate socket interface that causes parasitic effects and the need for calibration.
2Ease of operation
If a socketed test fixture is used, then device handling is simplified, but device complexity and fixture structure increase
Solution Approach 1:
The socket component is completely removed from the fixture structure. The test board is designed with direct solder pads that accept the QFN device without requiring a separate socket assembly, thereby simplifying the overall fixture structure while maintaining ease of device handling through standard soldering processes.
3Measurement precision
If extensive calibration and correlation testing is performed to compensate for parasitic losses, then testing accuracy improves, but testing time and complexity increase
Solution Approach 1:
By removing the socket from the test fixture, the source of parasitic losses is eliminated, making calibration and correlation testing unnecessary. This directly reduces testing time and complexity while maintaining or improving measurement precision through the direct connection between the QFN device and test board.
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 solution enables non-destructive testing of QFN devices with reduced parasitic losses, improving the accuracy of RF performance testing and eliminating the need for extensive calibration and correlation testing.
Implementation Method 1
movement of the toggle member along a first axis translates to at least a portion of the plurality of plungers applying a pressure sufficient to the top surface of the DUT to ensure a flushmount electrical contact
Data Source
AI summary
An apparatus comprises a toggle member, a plurality of pogo pins, and a test board in operable communication with the toggle member. The pogo pins are coupled to the toggle member to move along a first axis when the toggle member moves along the first axis. Each pogo pin includes a plunger that moves within the pogo pin along the first axis. The pogo pins and respective plungers contact a top surface of the DUT when the DUT is coupled to the test board and positioned so that a conductor on its outer surface is aligns to and contacts a conductive region of the test board. Movement of the toggle member along the first axis translates to the plungers, applying a pressure sufficient to the top surface of the DUT to ensure flushmount electrical contact between the conductor of the DUT and the conductive region.