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:
Aug. 09, 2011
Filed:
Oct. 23, 2007
Yongseon Koh, Palo Alto, CA (US);
Babak Matinpour, Sunnyvale, CA (US);
Vijaya Ceekala, San Jose, CA (US);
Yongseon Koh, Palo Alto, CA (US);
Babak Matinpour, Sunnyvale, CA (US);
Vijaya Ceekala, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An analog device under test circuit and a built-in test circuit for testing an AC transfer characteristic of the analog device under test are fabricated on an integrated circuit. The built-in test circuit includes an amplitude detector that detects the amplitude of the output signal of the analog device under test. The test time is reduced by sampling in real-time the DC value corresponding to the amplitude of the analog device under test. An additional reduction in the test time is achieved by using comparators with upper and lower limit reference signals and a pass-fail logic test.