Probe Card Warpage Correction for Semiconductor Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor device testing apparatuses face challenges in accurately testing semiconductor devices due to probe card warpage and vertical movement, leading to incorrect identification of defective chips and reduced yield, especially at varying temperatures.
Innovation Solution
An apparatus and method that include a chuck for holding the semiconductor wafer, a probe card with sensors and pressure devices to correct warpage, and a control unit to measure distances and apply correction forces, ensuring consistent contact and accurate testing by adjusting the probe card's position and shape during the testing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a probe card is used to test semiconductor devices, then electrical characteristics can be measured, but the probe card experiences warpage and vertical movement leading to testing inaccuracies
Solution Approach 1:
The probe card position is adjusted in advance before testing begins. The adjustment mechanism pre-positioning the probe card ensures that warpage and vertical movement do not affect the actual testing process, thereby maintaining measurement precision without requiring the probe card to be inherently stable during testing
Solution Approach 2:
A sensor detects the actual position of the probe card during testing and feeds this information back to an actuator. The actuator then adjusts the probe card position in real-time based on the detected deviations, ensuring accurate electrical characteristic measurements despite probe card warpage or vertical movement
2Adaptability or versatility
If temperature variations occur during testing, then testing adaptability is improved, but probe card warpage increases reducing measurement accuracy
Solution Approach 1:
The sensor continuously monitors probe card position under varying temperature conditions and provides feedback to the actuator. This closed-loop control compensates for temperature-induced warpage in real-time, maintaining measurement accuracy across different temperatures while preserving testing adaptability
Solution Approach 2:
The system changes the control parameter (probe card position) dynamically in response to temperature variations. By adjusting the position parameter based on actual conditions rather than maintaining a fixed rigid structure, the system achieves both temperature adaptability and measurement precision
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 effectively corrects probe card warpage and vertical movement, ensuring accurate electrical testing of semiconductor devices across different temperatures, reducing the likelihood of misidentifying good chips as defective and improving overall testing efficiency.
Implementation Method 1
a sensor to measure a relative distance disposed in the probe card
Implementation Method 2
a pressure device connecting the base unit to the probe card, the pressure device correcting deformation of the probe card
Data Source
AI summary
Provided is an apparatus for testing a semiconductor. The apparatus includes a chuck on which a wafer is disposed, a probe card disposed on the chuck to provide a test signal to the wafer, a sensor disposed in the probe card, a base unit connected to the probe card to transmit the test signal to the probe card, and a pressure device connecting the base unit to the probe card, the pressure device correcting deformation of the probe card.