US 12,188,964 B2
Spur detection in a sampled waveform in a mixed analog/digital system using the magnitude of the frequency response
Timothy Lindquist, Rochester, MN (US); Paul E. Dahlen, Rochester, MN (US); George R. Zettles, IV, Rochester, MN (US); Layne A. Berge, Rochester, MN (US); Kent H. Haselhorst, Byron, MN (US); Daniel Ramirez, Rochester, MN (US); and Sierra Spring, Rochester, MN (US)
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Oct. 4, 2019, as Appl. No. 16/593,025.
Prior Publication US 2021/0102976 A1, Apr. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 13/02 (2006.01); G10L 21/14 (2013.01)
CPC G01R 13/0272 (2013.01) [G10L 21/14 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method comprising:
converting, by a target system, an analog signal to a digital signal, wherein the target system includes a digital to analog converter (DAC) and analog to digital converter (ADC) pair;
by program instructions on a computing device,
acquiring, from the digital signal, a sample waveform including a set of discrete uniformly spaced samples from the target system, wherein the sample waveform is a time domain vector;
applying FFT transforming the time domain vector into a frequency domain;
analyzing the frequency domain response including calculating a magnitude response; and
determining, based on comparing a noise value of the magnitude response to an average noise floor threshold, whether the sample waveform has spurs, including determining that the sample waveform has no spurs when the noise value of the magnitude response is below the average noise floor threshold and determining that the sample waveform has one or more spurs when the noise value of the magnitude response is above the average noise floor threshold, wherein a spur indicates unaligned data having a delayed bit flip.