Apparatus and method for broadband feedforward predistortion
US6285252A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Sep 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3241
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifying circuit and associated method that outputs a distortion-free signal. The circuit includes an output amplifier driven by two intermediate amplifiers having differing gain factors. The intermediate amplifiers are coupled via an attenuator, a phase shifter, a signal splitter, and signal combiner and produces a predistortion signal that cancels the distortion signal generated from the output amplifier. Another similar amplifying circuit includes an additional combiner and splitter loop, and independently cancels the distortion signal generated by the first intermediate amplifier and the distortion signal generated by the output amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.