Apparatus with reduced A/D dynamic range requirement in a compensating feedback system
US5917373A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Jun 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/57
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus for compensating signal distortion via use of a feedback path, with reduced analog to digital conversion capacity requirements. In one embodiment, the apparatus is part of a transmission system which has an analog amplifier that distorts an information signal. Prior to the amplification, the information signal is provided in a digital format, processed digitally, and converted to analog for input to the amplifier. A sample signal is coupled off of output of the amplifier and applied along the feedback path. An analog-to-digital converter is located along the feedback path. A pre-distortion corrector is at the end of the feedback path. The pre-distortion corrector operates upon the source information using feedback data indicative of the amplifier distortion. Specifically, the information signal is pre-distorted (prior to input to the amplifier) to compensate for the distortion of the amplifier. A summation device is located along the feedback path, upstream of the analog-to-digital converter, to remove a source-based portion from the sample signal and for providing the sample signal containing only the amplifier distortion portion to the converter for conversion to dig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.