Semiconductor Device Testing via Operation Mode Parameter Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor devices with defective cells are often discarded due to inefficient testing methods, which can be costly and wasteful, as existing techniques require redundant cells to compensate for faults, increasing chip area and potentially degrading performance over temperature and process variations.
Innovation Solution
A method and system for testing semiconductor devices in multiple operation modes to detect optimal operating environments, allowing the device to operate in a mode where it performs properly, even if it fails in stricter conditions, by sequentially testing and programming the device to operate in less stringent conditions such as varying CAS latency or PVT conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy cells are used to compensate for defective cells, then device reliability is improved, but chip area increases
Solution Approach 1:
The patent applies parameter changes by testing semiconductor devices under multiple operation modes with varying parameters (such as different voltage levels, temperature conditions, and frequency ranges). Instead of using redundancy cells to compensate for defects, the invention identifies operation parameter ranges where defective devices can still function acceptably, thereby maintaining reliability without increasing chip area.
2Reliability
If redundancy cells are used to compensate for defective cells, then device reliability is improved, but device complexity increases
Solution Approach 1:
The patent avoids adding redundancy cells and instead changes the approach by varying operation parameters during testing. This method maintains device simplicity while identifying acceptable operation ranges for defective devices, thereby improving reliability without increasing device complexity.
3Manufacturing precision
If semiconductor devices are tested under strict operation conditions, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent applies partial action by testing devices under multiple operation modes rather than requiring all devices to meet the strictest single set of conditions. This allows devices with minor defects to pass testing under less stringent parameter ranges, thereby maintaining adequate manufacturing precision while improving production yield.
Solution Approach 2:
The invention changes testing parameters across multiple operation modes (voltage, temperature, frequency) rather than using fixed strict conditions. This approach identifies devices that can function acceptably under certain parameter ranges, improving productivity while maintaining sufficient manufacturing precision.
4Adaptability or versatility
If multiple operation modes are tested sequentially, then adaptability is improved, but testing time increases
Solution Approach 1:
The patent applies preliminary action by performing preliminary testing in multiple operation modes to identify devices that can operate acceptably under various conditions. This preliminary characterization allows for better device sorting and application matching, improving adaptability while the sequential testing approach is optimized to minimize time loss.
Data Source
AI summary
A method for testing a semiconductor device includes testing the semiconductor device in a plurality of operation modes sequentially, and programming the semiconductor device to operate in at least one of the operation modes when the semiconductor device passes the testing.