Systems and methods for accounting for residual passive intermodulation in passive intermodulation measuring instruments
US8816672B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 2011 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Jun 25, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for measuring passive intermodulation (PIM) comprises a port connectable with a load and a PIM source, a test signal source providing a test signal having components of two or more frequencies, and a receiver including a phase-coherent detector to receive a reflected signal obtained at the port in response to the provided test signal. The phase-coherent detector has an output that provides a signal indicative of PIM. A reference signal source connected with the phase-coherent detector provides a reference signal derived from the test signal. A signal combiner having a first input connected with the output of the phase-coherent detector, a second input connectable with storing a measurement of residual PIM generated by the apparatus, and removes the residual PIM from the signal indicative of PIM and provides measured PIM of the PIM source at the output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.