Polar loop radio frequency (RF) transmitter having increased dynamic range amplitude control
US7787570B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2005 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | Jan 23, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/36
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A closed loop power control system for a radio frequency (RF) transmitter comprises a first variable gain element located in a power control loop and configured to receive a power level signal and an inverse representation of a power control signal, a second variable gain element located in the power control loop and configured to receive an error signal and the power control signal, and a third variable gain element configured to receive an amplitude modulated (AM) signal and the power control signal, the third variable gain element having a gain characteristic configured to operate to reduce the gain applied to the AM signal when the power control signal falls below a minimum predetermined value, and to provide the AM signal as a reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.