Gain controller with comparator offset compensation for circuit having in-phase and quadrature channels
US6683926B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2000 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Jul 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0024
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a radio circuit (299) that forwards a signal pair (I,Q) by first (291, I) and second (292, Q) channels, by converting the signal pair (I,Q) from a digital form (ID, QD) to an analog form (IA, QA), a gain controller (200) monitors differences between the overall gains (GI, GQ) in the channels and corrects a gain imbalance by feeding back a gain determining control signal (W) to one of the channels. The gain controller (200) has digital comparators (221-224) at the inputs (281, 282) of the channels and analog comparators at the outputs (283, 284) of the channels. Intrinsic offsets of the analog comparators are determined and compensated by subtracting corresponding offsets from the digital comparators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.