Adaptive feedforward linearizer for RF power amplifiers
US5489875A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Sep 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3212
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A feed forward amplifier circuit for amplifying an input signal to produce an amplified replica thereof. A first splitter splits the input signal into first and second signal cancellation branches. The first signal cancellation branch contains an amplifier and a first "delay, gain and phase adjuster" (DGPA) connected in series between a-first output of the first splitter and the amplifier; and, a second splitter connected in series with the amplifier's output for splitting the amplified output signal into first and second distortion cancellation branches. The second signal cancellation branch contains a first delay line connected in series between a second output of the first splitter and a first input of a first combiner. The second splitter has a first output coupled to a second input of the first combiner. The first distortion cancellation branch contains a second delay line connected in series between a second output of the second splitter and a first input of a second combiner. The second distortion cancellation branch contains a third splitter connected in series between the first combiner and a second DGPA, and an auxiliary amplifier connected in series between the second DG…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.