ANALYSIS OF 2ND-ORDER HARMONIC DISTORTION OF ADC USING BISPECTRUM

This paper presents a new frequency-domain approach to test the second -order harmonic distortion of an analog-to-digital converter (ADC), It uses triple correlation and its Fourier transform, bispectrum, to sup press quantization noise and improve the testing accuracy of weak seco nd-order harmonics, Our approach is independent of the triggering dela y that is a known weakness of the spectral averaging method, The new m ethod is also less sensitive to the quantization noise than the power spectrum averaging method. Both theoretical analyses and illustrative computer simulations are provided.