Crosstalk test unit and method of calibration
US6297647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Dec 19, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test unit for measuring crosstalk in twisted pair cable. The test unit has an output signal balance (OSB) circuit that compensates for parasitic capacitance at its output terminals. The OSB circuit has a voltage controlled capacitance connected in circuit with each output terminal to control the effective capacitance between the output terminals and ground. The bias voltage for the variable capacitances is calibrated by a method in which the voltage for one of the variable capacitors is held constant while the voltage for the other capacitor is varied in voltage levels. A test signal frequency sweep is applied to the test unit output terminals. First and second voltage values are obtained and a final bias voltage value is calculated from using these two values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.