Gain switching device with reduced error for watt meter
US4486707A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Sep 24, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gain switching apparatus for a signal is controlled by a switching function formed as a function of the signal. The apparatus is provided with a circuit for reducing errors due to common frequency components in the switching function and in the signal being switched thereby. In order to reduce DC error resulting from multiplication of the switching function by a parameter representing the switched signal, the common frequency component of the switching function is substantially eliminated and replaced by a component at a frequency which is a multiple of the common frequency. A simplified logic circuit is provided to perform the frequency multiplication and the resultant error reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.