Method and apparatus for calibrating filtering of a transceiver
US7437139B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2005 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Mar 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1027
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus of calibrating filtering of receive and transmit signals is disclosed. The method of calibrating filtering of a received signal includes injecting an LO signal. The injected LO signal is filtered by a tunable filter. The filtered signal is frequency down-converted with an equivalent LO signal. The frequency down-converted signal is sampled while tuning the filtering. A desired filter tuning is determined based upon the samples and a frequency of the LO signal. The method of calibrating filtering of a transmit signal includes injecting an LO signal to a transmitter. The LO signal is filtered by a tunable filter. The filtered signal is frequency down-converted with an equivalent LO signal. The frequency down-converted signal is sampled while tuning the filter. A desired filter tuning is determined based upon the samples and a frequency of the LO signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.