System and method for measuring negative bias thermal instability with a ring oscillator
US7126365B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2004 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Jun 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/3011
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated circuit, in accordance with one embodiment of the present invention, includes a first device under test (DUT) module coupled to a first ring oscillator module and a second DUT module coupled to a second ring oscillator module. The first DUT module is biased such that interface traps are generated during a first mode. The generated interface traps result in a decrease in a first drive current of the first DUT module. The second device under test module is biased to maintain a reference drive current during the first mode. The operating frequency of the first ring oscillator module, during a second mode, is a function of the first drive current. The operating frequency of the second ring oscillator module, during the second mode, is a function of the reference drive current. The integrated circuit may also include a comparator module for generating an output signal as a function of a difference between the operating frequency of the first and second ring oscillator modules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.