Transmitter and method for RF power amplifier having a bandwidth controlled, detroughed envelope tracking signal
US8909175B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2013 |
| Grant date | Dec 9, 2014 |
| Priority date | — |
| Expiry date | Jun 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/451
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transmitter (70) generates a time-varying, detroughed, biasing signal (154) for an RF power amplifier (10) so that the RF power amplifier (10) is biased in accordance with an envelope tracking scheme. A trough-filling section (94) is responsive to an envelope tracking signal (86), which in turn is responsive to a magnitude signal (90) extracted from a complex baseband communication signal (76). The trough-filing section (94) includes a limiting stage (108) that forms a raw troughing signal (110) which expands the bandwidth of the envelope tracking signal (86). A filtering stage (116) reduces the bandwidth of the raw troughing signal (110) to form a trough-filling signal (122) that is combined back into the envelope tracking signal (86) using a linear process that maintains the bandwidth of the envelope tracking signal (86).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.