Packet based DDS minimizing mathematical and DAC noise
US9292035B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 2014 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Sep 22, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9046
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.