Method for a phase calibration in a frontend circuit of a near field communication device
US10749616B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 2019 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Aug 12, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/266
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for a phase calibration in a frontend circuit of a near field communication (NFC) tag device is disclosed. An active load modulation signal is generated with a preconfigured value of a phase difference with respect to a reference signal of an NFC signal generator device. An amplitude of a test signal present at an antenna of the NFC tag device is measured. The test signal results from overlaying of the reference signal with the active load modulation signal. The following steps are repeated: modifying the value of the phase difference, providing the active load modulation signal with the modified value of the phase difference, measuring an amplitude of the test signal and comparing the measured amplitude with the previously measured amplitude until the measured amplitude fulfills a predefined condition. The value of the phase difference corresponding to the previously measured amplitude is stored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.