Test System Voltage Drop Branch for IC Connection Verification
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Solution Overview
Problem
Existing automated test equipment (ATE) systems for integrated circuits (ICs) face challenges in determining whether an effective electrical connection is formed between the driving and detection lines (F line and S line) and the device under test (DUT), which is crucial for ensuring the correct voltage is applied and detected.
Innovation Solution
A test system comprising a first test apparatus with a driving branch and a detecting branch, connected to a second test apparatus with a voltage drop branch, where the voltage drop detected is used to determine the effectiveness of the electrical connection between the driving and detecting branches and the DUT, utilizing switching devices like diodes and relays to differentiate between effective and ineffective connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage drop detection is used to determine electrical connection effectiveness, then connection reliability is improved, but device complexity increases due to additional voltage drop branch and switching devices
Solution Approach 1:
The patent introduces a voltage drop branch as an intermediary measurement path that indirectly detects connection effectiveness. Instead of directly testing the connection between test lines and DUT, the voltage drop branch measures voltage drops across known resistances (R1, R2) in series with the test lines. This intermediary measurement approach resolves the contradiction by providing reliable connection detection through indirect measurement, avoiding the need for complex direct testing mechanisms.
2Measurement precision
If switching devices are added to differentiate effective and ineffective connections, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs switching devices (S1, S2) that can dynamically change the measurement circuit configuration based on connection status. The switches enable the system to adaptively select different measurement paths: when connections are effective, the circuit measures voltage drops across R1 and R2; when connections are ineffective, the circuit configuration changes to detect the open circuit condition. This dynamic reconfiguration provides precise connection status detection while keeping the overall device complexity manageable through controlled switching rather than permanent complex circuitry.
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 accurate determination of electrical connections between the test lines and the DUT, ensuring proper voltage application and detection, thereby improving the reliability of IC testing by identifying and addressing any connection issues.
Implementation Method 1
a voltage drop detected by the driving branch is used to determine an effectiveness of an electrical connection formed between the driving branch and the device under test
Data Source
AI summary
A test system is provided. The system includes a first test apparatus and a second test apparatus. A device power supply of the first test apparatus (ATE) is electrically connected with a device under test (DUT) through a driving branch (F) and a detecting branch (S), the driving branch (F) being configured to provide an original driving current to the DUT b the device power supply during testing, and the detecting branch (S) being configured to detect an effective driving current reaching the DUT. The second test apparatus includes a first voltage drop branch, the first voltage drop branch is connected to the detecting branch (S), and a voltage drop detected by the driving branch (F) is used to determine an effectiveness of an electrical connection formed between the driving branch and the device under test, and an electrical connection formed between the detecting branch (S) and the DUT.