FFTView – Jitter Spectrum Analysis

The M1™ FFTView™ gives users a spectral view of their signals-under-test. The FFTView lets M1 users understand the jitter spectrum of their DUTs. The X-axis is in frequency units, and goes from 0 Hz to 1/2 of the fundamental frequency of the signal being measured. The FFT cannot go above this frequency because the 'sample rate' (for the purposes of the FFT) is equal to the fundamental frequency (the clock frequency for a Clock, or the data rate for a Data signal). In that case, Nyquist tells us that only frequencies up to 1/2 of that frequency can be extracted. The Y axis is in either decibel (dB) units or time units, as selected using the dropdown list. You may select either dB units or three different time units.  The time units are selected according to what amplitude you wish to see – RMS jitter, Peak (1-sided) jitter, or Peak-to-Peak (2-sided) jitter. Various filters and window methods (Hamming, Hanning, etc.) are available.