Interference reduction for direct conversion receivers
US6535725B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Mar 30, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/009
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The DC offset compensator compensates DC offsets resulting from interferor self mixing and interferor interaction with even-order nonlinearities. In one embodiment, the DC offset compensator resides in a mobile communication device. A radio frequency (RF) communication signal is mixed with a local oscillator signal (LO) in a direct conversion mixer. The communication signal, at certain times, will have both a communication signal of interest and interferor signals. The interferor signals induce signals in other portions of the mixer circuit, called interferor leakage signals, and the interaction between the two signals causes undesirable DC offsets in the mixer output. The DC offset compensator detects the presence of the interferor signals and provides a compensating signal to the output of the mixer such that the undesirable DC offset signals caused by the interferer self mixing and interferor interaction with even order-nonlinearities in the mixer are compensated out of the mixer output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.