Direct conversion receiver using a dithered local oscillator to mitigate adjacent channel coherent interference
US7024172B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2001 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Jan 17, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A direct conversion quadrature receiver and method are provided according to the invention. The receiver according to one embodiment includes a primary local oscillator (LO) that down-converts a received RF signal to a quadrature intermediate frequency (IF) signal. The receiver further includes a dithering controller responsive to the quadrature IF signal generated by the primary LO. The dithering controller communicates a feedback signal back to the primary LO. The feedback signal controls the primary LO in order to offset down-conversion of the RF signal by the quadrature IF signal. The dithering controller offsets the primary LO from a zero-IF signal in order to reduce a phase and gain error of the quadrature IF signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.