Envelope tracking amplifier
US8810314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2013 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Feb 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45318
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An envelope tracking power amplifier uses signal cancellation techniques to provide isolation between RF signals and envelope signals, without the use of filters. In this manner, the envelope tracking power amplifiers are capable of operating with envelope signals that are at or near the frequency of the corresponding RF signals. In at least one embodiment, a double balanced power amplifier is provided that includes a balanced RF input port, a balanced RF output port, and a balanced envelope input port. The balanced nature of the amplifier results in ports of the amplifier forming virtual grounds with respect to signals at other ports. In some other embodiments, a single balanced amplifier is provided that provides isolation between ports thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.