Circuits and methods for providing a control voltage and improving switch performance in radio frequency (RF) modules
US9344129B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2012 |
| Grant date | May 17, 2016 |
| Priority date | — |
| Expiry date | Jan 17, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus comprises at least one transmit amplifier and rectification circuitry located in the at least one transmit amplifier, which is configured to receive a RF signal and provide a rectified voltage, which is selectably added to a voltage supplied by a battery to generate a DC voltage supply signal that is a function of RF power level. A controller is configured to select between providing the VBAT or the VSupply signal to a transmit switch depending on one or more of a logic state and a mode of operation. An alternate apparatus comprises a charge pump circuit configured to quickly raise a voltage supplied to it and store the output voltage on a capacitor and then either shift a first frequency provided by a charge pump oscillator to a lower second frequency or turn off a charge pump clock to maintain a voltage on the capacitor during a transmit mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.