Transistor Threshold Voltage Extraction via Smart Sensing Window

The patent performs a preliminary full voltage sweep on a learning site to characterize the transistor's electrical behavior and determine its specific threshold voltage characteristics. This preliminary action enables the system to adapt the voltage sweep range for subsequent components, avoiding the need to perform complete sweeps on all components while maintaining measurement accuracy through the learned characteristics.

The patent dynamically adjusts the voltage sweep parameters (range and step size) based on the transistor's operating conditions and previously learned characteristics. By changing the sweep range from a fixed full range to an adaptive range centered around the threshold voltage, the system reduces test time while maintaining the precision needed for accurate threshold voltage extraction.

The patent segments the testing process into two distinct phases: a learning phase where full voltage sweeps are performed on selected components to build a database of characteristics, and an application phase where adaptive sweeps are performed on remaining components using the learned data. This segmentation allows the system to maintain high measurement precision for all components while significantly improving productivity by avoiding redundant full sweeps on components that can be characterized using learned patterns.

The patent creates a digital model or copy of the transistor's electrical characteristics through the learning phase, storing the threshold voltage and operational parameters. During the application phase, this copied information is used to predict and guide the voltage sweep for subsequent components, eliminating the need to perform complete characterizations again and thereby maintaining measurement accuracy while boosting manufacturing throughput.

The patent performs a preliminary learning phase where the test engine collects and stores transistor characteristic data in a database. This preliminary data collection simplifies subsequent testing by providing reference information that guides the adaptive voltage sweeps, reducing the need for complex real-time calculations and algorithms during the main testing process.

The patent introduces a database as an intermediary between the test engine and the transistors being tested. This database stores learned characteristics and serves as a reference for determining appropriate voltage sweep ranges, simplifying the test engine's complexity by offloading the memory and retrieval operations to the database rather than requiring complex onboard processing capabilities.