Reducing LO leakage in a direct conversion receiver quadrature stage
US6766157B1 · kind B1 · utility
12Cited by
20References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jun 18, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/008
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An LO leakage canceller for a direct conversion receiver is disclosed. The canceller includes an RF input stage operating to provide at least two input signals, a local oscillator, an in-phase processor, and a quadrature processor. The local oscillator is configured to produce at least two reference signals for modulating the two input signals. Each of the in-phase and quadrature processors includes two consecutive quadrature splitters operating to substantially reduce leakage of the reference signal from the local oscillator to the RF input stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.