INL detection and calibration for phase-interpolator
US11569804B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2022 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Apr 22, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00058
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus includes control logic coupled to a phase detector circuit and an adjustable delay circuit. The control logic is configured to obtain a state of a first phase of an output signal of a phase interpolator relative to a second phase of a reference signal, and adjust a delay of the reference signal until the second phase matches the first phase. The control logic is further configured to measure a total delay of the reference signal when the second phase matches the first phase, and determine integral non-linearity of the phase interpolator at the first code based on the total delay. The control logic may further calibrate a first code of a phase interpolator based, at least in part, on the integral non-linearity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.