Low noise wideband digital predistortion amplifier
US6570444B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Jan 26, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital predistortion amplifier design compensates for non-linear amplification of an input signal using predistortion techniques. The design provides a reduced noise floor by using separate digital to analog converters (DAC) to separately convert the input signal and an error correction signal. Furthermore, the input signal can be separated into two or more subbands of narrower bandwidth. Each of the subbands are converted to analog using a separate DAC. By reducing the power and/or bandwidth to be handled by any one DAC, the available levels of quantization of the DAC are applied to a lower power signal and therefore the signal to noise ratio resulting from the conversion process is improved. In addition, each digital subband is passed through a correction filter, which is driven by an adaptive control processing and compensation estimator to compensate for relative gain, phase, and delay inconsistencies between the different subbands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.