Near homodyne radio frequency receiver
US5826180A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1994 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Aug 16, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A radio frequency receiver and method for operating one is disclosed. The receiver includes a tuning unit, an inphase-quadrature (I/Q) mixer, and a calibrated image rejection processor. The tuning unit selectably tunes to a tuning frequency close but not equal to an input modulated radio frequency and creates thereby a periodic signal having the tuning frequency. The I/Q mixer convolves the modulated radio frequency signal with inphase and quadrature versions of the periodic signal and low pass filters the resultant signals. The calibrated image rejection processor corrects at least one of the filtered resultant signals and performs image rejection on the corrected signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.