Semiconductor Inspection System Diode Integration
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Solution Overview
Problem
Existing semiconductor test equipment lacks accuracy in inspecting device characteristics due to long interconnections and the presence of disconnection units, which increase inductance and reduce inspection precision for devices like bear chips.
Innovation Solution
An inspection system where a diode is loaded in parallel with the device to be tested, allowing for movement to static and dynamic characteristic test stations, reducing interconnection length and eliminating the need for disconnection units, thereby improving accuracy through a diode connection mechanism that includes an elevating mechanism and flexible cables for easy connection and separation from test circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the diode is embedded in the test circuit at a spaced position, then the test circuit configuration becomes simpler, but the interconnection length increases and inspection accuracy deteriorates
Solution Approach 1:
The diode and device to be tested are merged onto the same stage, eliminating the need for separate embedding of the diode in the test circuit. This combination shortens the interconnection length between the diode and device, reducing inductance and improving inspection accuracy while maintaining test circuit configuration simplicity.
Solution Approach 2:
The diode and device to be tested are disposed in the same plane (on the same stage), changing the spatial arrangement from a spaced three-dimensional configuration to a coplanar two-dimensional arrangement. This dimensional change minimizes interconnection length and inductance, thereby improving measurement precision.
2Adaptability or versatility
If a disconnection unit is used to connect the diode to test circuits, then the diode can be connected to multiple test circuits, but the interconnection length increases and inductance increases, reducing inspection accuracy
Solution Approach 1:
The disconnection unit is extracted and eliminated from the system. Instead of using a disconnection unit to connect the diode to multiple test circuits, the diode is directly connected to the device to be tested on the same stage, and the stage itself enables connection to different test circuits, removing the source of additional inductance.
Solution Approach 2:
The stage serves as an intermediary that enables the diode to connect to multiple test circuits without requiring a disconnection unit. The stage's movement mechanism provides the connection flexibility previously achieved by the disconnection unit, but without the associated inductance penalty.
3Ease of manufacture
If the diode is disposed far from the device to be tested, then the test circuit layout becomes easier, but the interconnection length increases and inductance increases, reducing measurement accuracy
Solution Approach 1:
The diode and device to be tested are merged onto the same stage, eliminating the need for separate positioning that would require long interconnections. This merging maintains ease of manufacture by keeping the overall structure simple while dramatically reducing interconnection length and inductance for improved measurement accuracy.
Data Source
AI summary
In an inspection system for a device to be tested, a stage, on which a device to be tested and a diode are loaded, is moved to a static characteristic test station and a dynamic characteristic test station. A method for operating an inspection system for a device to be tested includes a process of carrying in and loading the stage, on which the device to be tested and the diode are loaded, a process of carrying in and fixing the device to be tested to a test station, a process of bringing a probe into contact with the diode, a process of switching a position of the diode, a process of performing a measurement with respect to the device to be tested, a process of carrying out the device to be tested from the stage, and a process of classifying the device to be tested.