Built-in Test Circuit for TSV Electrical Integrity
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Solution Overview
Problem
Current testing technologies are inadequate for evaluating the electrical integrity of through silicon vias (TSVs) in three-dimensional structures, particularly due to the difficulty in accessing and contacting the insulated vias, leading to unreliable measurements and potential damage during testing.
Innovation Solution
Integration of a built-in test circuit within the wafer or chip that allows for electrical testing of through vias by circulating a test current through a semiconductor diode structure, enabling measurement of resistance and insulation without direct contact, which reduces parasitic couplings and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct contact testing is used on through vias, then measurement can be performed, but the via may be damaged and measurements become unreliable
Solution Approach 1:
The patent introduces a test circuit as an intermediary component that mediates between the external testing equipment and the through via. This test circuit includes a diode connected to the via, allowing measurements to be performed on the diode rather than directly on the via, thereby protecting the via from damage while still enabling accurate electrical characteristic measurement.
2Reliability
If through vias are insulated from substrate, then leakage currents are prevented, but accessing and contacting the vias for testing becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-connecting a test circuit to the through via during the manufacturing process, before the via needs to be tested. The diode is connected to the via and extends to an accessible location, so that when testing is required, the via is already prepared with a built-in test structure that maintains insulation while providing test access.
3Ease of manufacture
If traditional testing equipment is used, then production costs are reduced, but testing capability for three-dimensional structures is insufficient
Solution Approach 1:
The patent makes traditional testing equipment universal by designing a test circuit that can be tested using conventional equipment while also being applicable to advanced three-dimensional stacked structures. The diode-based test circuit provides a standardized interface that works with traditional testers, yet the architecture supports complex 3D configurations, thereby extending the versatility of legacy equipment without requiring expensive new testing systems.
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
Enables reliable electrical testing of through vias without damaging them, improving measurement accuracy and reducing assembly and production costs by using traditional testing equipment, even in three-dimensional stacked structures.
Implementation Method 1
allows for electrical testing of through vias by circulating a test current through a semiconductor diode structure, enabling measurement of resistance and insulation
Data Source
AI summary
A testing system for carrying out electrical testing of at least one first through via forms an insulated via structure extending only part way through a substrate of a first body of semiconductor material. The testing system has a first electrical test circuit integrated in the first body and electrically coupled to the insulated via structure. The first electrical test circuit enables detection of at least one electrical parameter of the insulated via structure.