Methods and apparatus for measuring relative gain and phase of voltage input signals versus voltage output signals
US4638248A · kind A · utility
63Cited by
9References
10Claims
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Key dates
| Filing date | Jun 10, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Jun 10, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for accurately measuring frequency response (phase and gain) in either a wireless or in a wired mode of operation is described. When used in either mode, a multiplexing method is employed which allows the use of a narrow channel bandwidth, with a simultaneous improvement in overall accuracy. Cancellation of all linear and time invariant errors, including those of the analog to digital conversion process, is thus accomplished. As a result, the system error only depends on the differential nonlinearity of the channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.