Periodic jitter determination for a phase noise measurement

Abstract

A signal analysis system is disclosed. The signal analysis system to: transforms a digitized radio frequency signal into a first transformed digital signal; digitally downconverts the digitized radio frequency signal to a first baseband signal; filter the first baseband signal into a first filtered signal; transforms the first filtered signal into a second transformed digital signal; computes a first phase noise spectrum from the second transformed digital signal, detects spurs and frequencies corresponding to the spurs in the first phase noise spectrum, and set frequency bins not including spurs to zero to generate a modified second transformed digital signal; inversely transforms the modified second transformed digital signal into a first complex time-domain baseband signal; demodulates a first phase signal in the first complex time-domain baseband signal to obtain a first demodulated signal; and obtains an average of slopes and frequency error from the slopes of the first demodulated signal.