Envelope detector-based feedback for radio frequency (RF) transmitters
US10333764B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2018 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Jun 26, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C2200/0058
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmitter is provided to address transmitter non-idealities. The transmitter uses a series of envelope detectors to detect imbalances between an I branch and a Q branch of an I/Q modulator that is implemented as part of the transmitter's front end, and these detected imbalances may be compensated by pre-distorting digital baseband signals fed to the I branch and the Q branch. The transmitter may also use a series of envelope detectors to detect nonlinearities in one or more of the transmitter's amplification stages, and these detected nonlinearities may be compensated by modifying the baseband signals via a digital linearization pre-compensator. The transmitter may also support both implementations in either a time-switched or simultaneous manner, allowing for I/Q imbalances and nonlinearities to be addressed using a single transmitter design.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.