The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 2016
Filed:
Oct. 28, 2014
Texas Instruments Deutschland Gmbh, Freising, DE;
Ralf Sonnhueter, Schrobenhausen, DE;
Anton Ecker, Eching Bayern, DE;
TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US);
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.