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:
Mar. 22, 2016
Filed:
Jan. 24, 2014
Andrew Thomas, Westford, MA (US);
Andrew Thomas, Westford, MA (US);
OLYMPUS SCIENTIFIC SOLUTIONS AMERICAS INC., Waltham, MA (US);
Abstract
Disclosed are a method of and an apparatus devising a packet based DDS circuitry for performing packet based a direct digital synthesizing (DDS) function within an electronic testing instrument. The circuitry comprising a DDS logic circuit configured to execute direct digital syntheses on a plurality of consecutive packets of sine-like waves, each packet having a length of a period precisely chosen such that the sine wave at the end of one packet matches up with the sine wave at the start of the immediate subsequent packet. Also disclosed is an eddy current testing circuitry using multiple outputs of the single packet based DDS, one of the output is used in a circuit producing reference signals approximating the response signals. With the usage of the packet based DDS, the reference signal can be highly effective in nulling the unchanging portion of the response signals.