Power amplifier
US6972621B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2004 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Oct 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/102
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power amplifier capable of compensating for distortion by pre-distortion and achieving a large distortion suppressing effect even if IM3L components and IM3U components occurring at the power amplifier have a large level difference. A power amplifying circuit 117 amplifies an original signal. An envelope detector 119 generates an envelope signal having components identical to envelope components included in the original signal. Based on the original signal a distortion signal generating circuit 112 generates a distortion signal for canceling distortion components occurring while the original signal is amplified by the power amplifying circuit 117. In a power combiner 116, the envelope signal is injected to the original signal, thereby eliminating the asymmetric characteristic of the distortion components. In the power amplifying circuit 117, the distortion signal is injected to the original signal, thereby suppressing the distortion components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.