Maintaining loop linearity in presence of threshold adjustment
US8058929B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2010 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | May 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45973
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a method includes receiving, at a filter comprising a Miller amplifier, a differential data signal output by a limiting amplifier (LA), the data signal comprising an output direct current (DC) offset resulting at least in part from a threshold-adjustment signal applied to the LA or an intrinsic DC offset caused by physical characteristics of the LA. In one embodiment, the method additionally includes generating a compensation signal based on the threshold-adjustment signal, a polarity of the compensation signal being opposite a polarity of the threshold-adjustment signal or the DC offset, a magnitude of the compensation signal being a function of the magnitude of the threshold-adjustment signal. In one embodiment, the method further includes introducing the compensation signal to an internal node of the Miller amplifier to compensate for the DC offset to keep one or more amplifier stages of the Miller amplifier in their linear operating regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.