Gain controller for circuit having in-phase and quadrature channels, and method
US6671336B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2000 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | May 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3809
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a radio circuit (299) that forwards a signal pair (I,Q) by a first channel (291, I) and by a second channel (292, Q), 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 controller has first (221-224) and second (211-214) pluralities of single-bit comparators, operating at a high sampling rate, to monitor the signal pair at the channel inputs (281, 282) and at the channel outputs (283, 284), respectively, and to provide difference signals (&Dgr;X,&Dgr;Y) to an integrator (280) that calculates the gain control signal (W) at a decimated sampling rate (FR).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.