Automatic test equipment for testing an oscillating crystal and method for operating the same
US8872523B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2011 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Oct 2, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2841
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Embodiments of the invention relate to automatic test equipment for testing a circuit having an oscillating crystal and to a method for operating such automatic test equipment. A generator generates a first signal comprising an oscillating part having at least one predetermined frequency. A first terminal couples the first signal to the oscillating crystal. At least one predetermined frequency is located inside a predetermined window around one of the resonance frequencies of the oscillating crystal. An analyzer has a second terminal coupled to the oscillating crystal for detecting a second signal and a rectifier connected in series with a low-pass filter for rectifying and filtering the second signal. A detector for detects a DC-signal at the output of the low-pass filter and for signals a valid test result for the oscillating crystal if the DC-signal exceeds a certain threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.