Multi-site Probe Card for Concurrent Wafer Testing
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Solution Overview
Problem
The increasing complexity of semiconductor integrated circuit (IC) manufacturing and demand for more test patterns lead to significantly increased test time and cost due to the generation of charges during processes like grinding, etching, and deposition in three-dimensional (3D) ICs, necessitating more efficient wafer testing methods.
Innovation Solution
A multi-site probe card system is used for wafer testing, featuring first and second probe sites that simultaneously perform different tests on the same die, allowing for concurrent ESD discharge, burn-in, and manufacture tests, reducing overall testing time and cost by optimizing probe pad and needle footprints and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more test patterns are performed on each die to ensure proper operation, then testing completeness is improved, but test time and test cost are dramatically increased
Solution Approach 1:
The probe card is divided into multiple independent probe sites (first probe site, second probe site, etc.), each capable of performing different tests simultaneously on the same die. This segmentation allows parallel testing of multiple functions without increasing total test time.
Solution Approach 2:
Multiple test functions (ESD discharge test, burn-in test, manufacture test) are merged into a single integrated probe card system that performs all tests concurrently on the same die, eliminating the need for sequential testing and reducing overall test time.
2Reliability
If more test patterns are performed on each die, then testing completeness is improved, but test cost is dramatically increased
Solution Approach 1:
The probe card is designed as a universal testing platform with multiple probe sites that can perform various test functions simultaneously. This multi-functionality eliminates the need for multiple separate test setups, thereby reducing test cost while maintaining comprehensive testing coverage.
Solution Approach 2:
Multiple test functions are combined into a single probe card system, allowing concurrent execution of ESD discharge tests, burn-in tests, and manufacture tests. This consolidation reduces equipment costs and operational expenses associated with multiple separate testing systems.
3Productivity
If traditional single-site probe card is used, then device complexity is low, but testing efficiency is poor
Solution Approach 1:
The probe card is segmented into multiple independent probe sites, each with its own probe needles and test circuitry. This segmentation enables parallel testing operations, significantly improving testing efficiency despite the increased structural complexity.
Solution Approach 2:
The probe card transitions from a single-site (one-dimensional) architecture to a multi-site (two-dimensional) array configuration. This dimensional expansion allows multiple tests to be performed simultaneously on different locations of the die, dramatically improving testing throughput.
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 approach enables simultaneous testing of multiple functions on each die, reducing the overall testing time and cost by allowing two types of tests to be performed in the same time period, thereby improving the efficiency of wafer testing processes.
Implementation Method 1
One of the at least one first probe site touches the first probe pads of a die to perform the first test at a first time period... perform ESD discharge
Data Source
AI summary
A system for testing a wafer includes a probe card and a wafer. The probe card includes at least one first probe site and at least one second probe site. The wafer includes a plurality of dies. The at least one first probe site is arranged for a first test, and the at least one second probe site is arranged for a second test. Each of the plurality of dies corresponds to first probe pads and second probe pads. Each of the at least one first probe site is arranged to touch the first probe pads of each of the plurality of dies. Each of the at least one second probe site is arranged to touch the second probe pads of each of the plurality of dies.