Apparatus and methods for envelope tracking
US11770104B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2023 |
| Grant date | Sep 26, 2023 |
| Priority date | — |
| Expiry date | Jan 23, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/0441
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker is provided for a power amplifier that amplifies an RF signal. The envelope tracker includes a multi-level switching circuit having an output that provides an output current that changes in relation to an envelope signal indicating an envelope of the RF signal when the envelope tracker is operating in an envelope tracking mode. The multi-level switching circuit includes a multi-level supply (MLS) modulator that receives multiple regulated voltages of different voltage levels, and an MLS control circuit that controls the selection of the MLS modulator over time based on the envelope signal. When transitioning the MLS modulator from selection of one regulated voltage level to another regulated voltage level, the MLS control circuit provides a soft transition to gradually switch the regulated voltage levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.