Noncoherency correction algorithm for removing spectral leakage in ADC spectral test

A noncoherency correction algorithm is proposed to remove the spectral leakage caused by noncoherent sampling in ADC spectral test. The coherent data is reconstructed from the original data by an additional FFT and only a few simple time domain operations. Then accurate spectral testing results can be obtained by performing normal FFT on the reconstructed data. Compared with windowing techniques, the proposed method can acquire better spectral testing accuracy without any prior knowledge. Theoretical analysis, simulation and experimental results demonstrate that the developed method can achieve the estimation accuracy comparable to that of coherent sampling method but without requiring coherent sampling.