Distortion-compensated amplifying circuit
US6720829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2002 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Dec 20, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3282
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Provided is a distortion-compensated amplifying circuit capable of suppressing distortion without attenuating a level of carrier components, and further obtaining a larger amount of suppression of distortion, which has not been achievable by conventional distortion-compensated amplifying circuit using a pre-distortion technique. A balanced type amplifying circuit is structured such that amplifiers 115 and 116 placed in parallel are sandwiched by 90-degree hybrid circuits 114 and 117. The 90-degree hybrid circuit 114 is supplied with an original signal including carrier components and a distortion signal including distortion equal in amplitude and opposite in phase (having a phase difference of 180 degrees) to distortion that occurs when the original signal is amplified by the amplifiers 115 and 116. The 90-degree hybrid circuit 114 performs a process of differential amplification with a phase difference of 180 degrees between the original signal and the distortion signal. Then, the amplified original signal and distortion signal outputted from the 90-degree hybrid circuit 117 are combined by a directional coupler 118, thereby canceling distortion components included in both signals…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.