Driving point reference plane time domain reflectometry method for measuring characteristic impedance
US5498965A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1993 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Dec 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2822
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method for determining the characteristic impedance of a transmission line on a printed wiring board using time domain reflectometry. The method involves selecting a driving point in time, selecting an undisturbed interval, measuring voltage at predetermined time intervals across the undisturbed interval, determining from the measured voltages a curve representative of such voltages, and determining the voltage on the representative curve at the driving point. The characteristic impedance of the transmission line under test, denoted by Z.sub.0, is obtained by using the "driving point" of the transmission line as the reference plane for the impedance measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.