Method of reducing imbalance in a quadrature frequency converter, method of measuring imbalance in such a converter, and apparatus for performing such method
US7580680B2 · kind B2 · utility
11Cited by
9References
38Claims
0Family size
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Key dates
| Filing date | May 24, 2006 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Aug 22, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/166
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method is provided for reducing imbalance in a quadrature frequency converter. A test tone generator controlled by an alignment controller supplies a test signal to the input of the frequency converter. A starting point is selected in a solution space addressed by I and Q corrections. The starting point comprises in-phase (I) and quadrature (Q) phase correction values. A test is then performed to determine the best direction of movement in the I/Q phase correction plane in order to reduce phase imbalance. The I and Q phase correction values are then moved in that direction towards a phase imbalance minimum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.