Measuring apparatus, measuring method, recording medium, and test apparatus
US8090011B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 2007 |
| Grant date | Jan 3, 2012 |
| Priority date | — |
| Expiry date | May 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/367
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Provided is a measuring apparatus which measures a quadrature modulator, including a supplying section supplying the quadrature modulator with a reference I signal having a predetermined frequency and a reference Q signal whose phase is shifted by 90 degrees from the reference I signal, an extracting section extracting, from a modulation signal output from the quadrature modulator by applying quadrature modulation to the reference IQ signals, a main signal component as the reference IQ signals modulated, and an image signal component occurring at a position symmetric to the modulated reference IQ signals with respect to the carrier signal, and a measurement value calculating section calculating at least one of a carrier phase error and amplitude error which occur between I signal and Q signal sides of the quadrature modulator, and a skew between IQ signals of the quadrature modulator, based on the main signal component and image signal component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.