A method of serial data jitter analysis using one-shot time interval measurements

A method for measuring inter-symbol interference, duty cycle distortion, random jitter and periodic jitter is described. The Blackman-Tukey method of signal analysis is used. This allows the application of jitter tolerance masks to ensure compliance to data communication standards. Note: Mathematical analysis and computer simulations have been performed. The autocorrelation function and an FFT for clock jitter analysis have been implemented on our current product. A provisional patent application has been filed. DEFINITIONS [1] Jitter in serial data communication is a difference of data transition times relative to ideal bit clock active transition times. UI is a Unit Interval. It is the average period of the bit clock. ISI is Inter-Symbol Interference. ISI is caused by a data path propagation delay that is a function of past data history and occurs in all finite bandwidth data paths. DCD is Duty Cycle Distortion. DCD is caused by differing propagation delays for positive and negative...

• Type: Conference
• Year: 1998
• Where: ITC
• Authors: Jan B. Wilstrup
• Keywords: Hardware, ITC 1998, Jitter, Jitter Tolerance Mask, Periodic Jitter