Phase rotator non-linearity reduction
US11206031B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2020 |
| Grant date | Dec 21, 2021 |
| Priority date | — |
| Expiry date | Oct 28, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase rotator receives control signals and thermometer coded signals that specifies the phase of an output signal. The phase rotator may be used, for example, by a clock and data recovery (CDR) circuit to continually rotate the phase of a clock to compensate for phase/frequency mismatches between received data and the clock. The control signals determine the phase quadrant (i.e., 0°-90°, 90°-180°, etc.) of the output signal. The thermometer coded signals determine the phase of the output signal within a quadrant by steering a set of bias currents between two or more nodes. The set of bias currents are selected to reduce the non-linearity between the thermometer coded value and the phase of the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.