US 6,687,630 B2 · Low leakage technique for determining power spectra of non-coherently sampled data

Abstract

A technique for determining the amplitudes of frequency components of a waveform sampled from an automatic test system includes assembling a list of N frequencies expected to be found in the sampled waveform. A test program running on the tester generally supplies the list of frequencies. The technique assumes that the sampled waveform conforms to an idealized waveform model that mathematically corresponds to a sum of N sinusoids. Each of the N sinusoids that make up the model has unknown amplitude and a frequency that equals one of the N frequencies in the list of frequencies. The technique attempts to solve for the unknown amplitude of each of the N frequencies by mathematically minimizing, via a linear least-squares algorithm, the difference between the model and the actual, sampled waveform.

Claims21

Dependent claims

A method of analyzing the frequency components of a sampled signal, comprising:

(A) creating a list of N different frequency components sought to be analyzed within the sampled signal, N>1, wherein the frequency of each of the N different frequency components is known and the amplitude and phase are unknown;
(B) modeling the sampled signal as a waveform model that corresponds to a sum of N sinusoids, each of the N sinusoids also having an unknown amplitude and phase, and a frequency that equals one of the frequencies of the N different frequency components;
and
(C) processing the waveform model to best fit the waveform model to the sampled signal.

1 more element

Dependencies are inferred from the claim text.

Low leakage technique for determining power spectra of non-coherently sampled data

Life of this patent

Low leakage technique for determining power spectra of non-coherently sampled data

Life of this patent

Abstract

Claims21