Near field communication (NFC) device and method of detecting resonance frequency of the same
US11411610B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2020 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | Oct 22, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/77
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A near field communication (NFC) device includes a resonator including an antenna and a matching circuit, a transmitter and a frequency detector. The transmitter generates a sensing voltage signal at the resonator. With respect to a plurality of measurement periods where each measurement period includes a turn-on period and a turn-off period, the transmitter is enabled to output a radio frequency (RF) signal to the resonator during the turn-on period and disabled during the turn-off period. The frequency detector detects a resonance frequency of the resonator based on the sensing voltage signal. The resonance frequency is accurately detected by measuring the resonance frequency during the plurality of measurement periods. In addition, the resonance frequency is efficiently detected by generating the sensing voltage signal using the transmitter established in the NFC device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.