TDDB Testing Parallel DUTs via Series Resistor Voltage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor testing systems are limited by the number of devices under test (DUTs) due to test pin constraints, leading to inadequate data for determining dielectric breakdown statistics and failing to efficiently capture local variability in integrated circuit reliability, which complicates the assessment of dielectric integrity and process superiority.
Innovation Solution
A method and system for performing time-dependent dielectric breakdown (TDDB) tests on multiple devices in parallel using a selection signal and a resistor arrangement, allowing simultaneous application of a test signal and detection of breakdown through voltage changes across the resistor, enabling efficient data collection and analysis of dielectric failure characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of test pins is increased to test more devices in parallel, then the data quantity for breakdown statistics improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
Multiple device under test (DUT) channels are merged into a single testing path by sequentially connecting DUTs to the test pins. The system combines multiple testing functions into one test pin interface, allowing parallel testing capability without increasing physical test pin count.
Solution Approach 2:
The testing system dynamically reconfigures the test circuit configuration during operation. Switches dynamically connect different DUTs to the test pins in sequence, and the system adapts the testing parameters and data collection process based on the current configuration state, enabling flexible parallel testing.
2Productivity
If devices are tested sequentially one by one, then the testing system complexity is reduced, but the testing time and productivity decrease
Solution Approach 1:
Multiple devices are prepared and positioned in advance in a ready-to-test configuration. The system pre-arranges the test circuit connections and device positions so that when testing begins, multiple DUTs can be immediately activated without sequential setup delays, enabling parallel testing execution.
3Measurement precision
If wafer-level testing is performed to capture local variability, then the measurement precision improves, but the device complexity and data processing requirements increase
Solution Approach 1:
The wafer is divided into multiple discrete device under test locations, each independently testable. The system segments the testing process into individual DUT channels that can be independently configured and tested, allowing precise local variability measurement while managing complexity through modular organization.
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 allows for the efficient gathering of large data points for statistical analysis, providing insights into dielectric breakdown characteristics and enabling faster process adjustments, thereby improving the reliability assessment and learning cycle for integrated circuit manufacturing.
Implementation Method 1
A determination may be made as to whether a breakdown and/or a failure of at least one of the first and second devices has occurred based upon a change in voltage across the first resistor
Data Source
AI summary
At least one method and system disclosed herein involves performing a time-dependent dielectric breakdown (TDDB) on a plurality of devices. A first device and a second device are provided for testing. A test signal is provided for performing a time-dependent dielectric breakdown (TDDB) test on the first and second devices. A selection signal for selecting said first and second devices for performing said TDDB test. The first and second devices are arranged in series with a first resistor such that based upon said selecting, the test signal is applied substantially simultaneously to the first and second devices through the first resistor. A determination is made as to whether a breakdown and/or a failure of at least one of the first and second devices has occurred based upon a change in voltage across the first resistor.