Correcting for non-linearity in an amplifier providing a differential output
US10312868B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2018 |
| Grant date | Jun 4, 2019 |
| Priority date | — |
| Expiry date | Apr 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/38
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fully differential amplifier includes a first feedback resistance, a second feedback resistance, a first input resistance and a second input resistance. A first ratio of the first feedback resistance to the first input resistance is equalized with that of a reference ratio of a pair of reference resistances. Similarly a second ratio of the second feedback resistance to the second input resistance is also equalized with that of the reference ratio. Such equalization operations may be performed during a calibration phase prior to normal operation of the fully differential amplifier. Accordingly, when a common mode voltage present on each of the first output terminal and the second output terminal varies during normal operation, contribution of an erroneous differential signal component across the pair of differential output terminals is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.