Patent ID: 7541958
Filing Date: 2009-06-02
Classification: G01R,H03M

Abstract:
1. A method of testing signals with a PTIC (parallel, time-interleaved converter) that includes M ADCs (analog-to-digital converters) each clocked at a rate F S and time-interleaved to provide an overall sampling rate of MF S , the method comprising: (A) stimulating a UUT (unit under test) to produce an SUT (signal under test) having at least one test reguirement: (B) applying the SUT to a PTIC: (C) acguiring a series of samoles of the SUT by each of the M ADCs of the PTIC; (D) performing a DFT (Discrete Fourier Transform) on each series of samples to yield M DFTs; (E) processing the M DFTs to yield a reconstructed spectrum covering a freguency range areater than F (F) analyzing the reconstructed spectrum to determine whether the UUT meets the at least one test reguirement; and (G) discarding or grading the UUT responsive to the determination of Step F, wherein the M DFTs each have DFT elements arranged by bin number, and the step E of processing further comprises: (E1) sorting the DFT elements from the M DFTs into groups according to bin number, wherein each group includes all DFT elements across the plurality of DFTs associated with the same bin number; (E2) accessing a plurality of collections of correction factors; and (E3) algebraically combining each group with a respective collection of correction factors.