Distortion-compensated RF transmitter and method therefor
US8605814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2007 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Nov 5, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0433
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An RF transmitter (10) includes an RF amplifier (28) that generates an amplified RF signal (36) including a linear RF signal (92) and a spurious baseband signal (94). The spurious baseband signal (94) interacts with bias feed networks (56, 66) to cause the RF amplifier (28) to generate an unwanted RF distortion at or near the allocated RF bandwidth. A baseband compensation signal (98) is generated and equalized in an adaptive equalizer (102) then fed to the RF amplifier (28). A feedback signal (46) is obtained from the RF amplifier (28) and used to drive the adaptive equalizer (102). A feedback loop causes the adaptive equalizer to adjust a baseband signal (24, 32) supplied to the RF amplifier (28) so that the RF distortion is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.