Configurable system for cancellation of the mean value of a modulated signal
US8901996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2010 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | Nov 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0052
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Some embodiments of the invention relate to a DC offset correction circuit comprising a feedback loop having a DAC controlled by a reconfigurable ADC, which determines (e.g., tracks) the mean value of a modulated input signal. The circuit operates according to two phase process. In a first “pre-modulation” tracking phase, an input signal is tracked by the ADC, which is configured to output the input signal's mean value as a digital code equivalent to the input mean value. The output of the ADC is provided to a DAC, which provides an analog representation of the mean value to an adder that subtracts the mean value from the modulated input signal to generate a bipolar adjusted input signal. In a second “modulation” phase, the estimated mean value is held constant, so that the bipolar adjusted input signal may be provided to an activated modulation circuit for improved system performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.