Dynamic headroom for envelope tracking
US8866547B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2013 |
| Grant date | Oct 21, 2014 |
| Priority date | — |
| Expiry date | Apr 19, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/451
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (PA) indicates that the PA headroom is insufficient. The initial headroom voltage may be updated to an operating headroom voltage that includes the initial voltage plus a deficiency voltage plus a margin. In this manner, the operating headroom voltage may be dynamically selected to minimize power consumption while still ensuring that the PA is linear. In a further aspect, a specific exemplary embodiment of a headroom voltage generator using a counter is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.