Configuration for two port TDR measurements
{"Image DocumentName": "Configuration for two port TDR measurements", "Image ImageDescription": "TDR stimulus. Active or aggressor line. TDT response. TDR response. FEXT. NEXT. Quiet or victim line. New Chapter: Two port TDR: Measuring cross talk. New section: Cross talk. So far, we evaluated the electrical performance of single transmission lines. When an adjacent transmission line is present, some of the energy from one line can couple into the second line. The voltage induced on the second line is a form of noise in that it can interfere and corrupt any signal that might already be present on the line, or might be mistaken for a valid signal by a receiver. To distinguish the two lines, we sometimes call the driven line the active line or the aggressor line. The second line is called the quiet line or victim line. This is illustrated in the figure. One end of the active line is driven by the TDR stimulus. We get the TDR response of the active line for free. If we connect the second port to the far end of the active line, we can measure the TDT response. If we connect the second port to the end of the quiet line adjacent to the stimulus, we can measure the noise induced on the quiet line. To distinguish the two ends of the quiet line, we refer to the end near the stimulus, the near end, and the end far from the source, the far end. The ratio of the voltage noise measured on the near end to the incident stimulus voltage going into the active line is defined as the Near End Cross Talk (NEXT). The ratio of the far end voltage noise to the incident stimulus voltage going into the active line is defined as the Far End Cross Talk (FEXT). These two terms are figures of merit in describing the amount of cross talk between two parallel, uniform transmission lines. They can be measured directly by a 2 port TDR. Group/Presentation Title. Agilent Restricted. Month ##, 200X.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}