Demodulator for near field communication, near field communication device, and electronic device having the same
US9634729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2016 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | Jun 16, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A demodulator for a near field communication (NFC) includes a first rectifier, a shifting rectifier, a field monitor and an edge detector. The first rectifier receives an antenna voltage through a first power terminal and a second power terminal, rectifies the antenna voltage and provides a first rectified signal to a first node. The shifting rectifier is enabled in response to an enable signal, receives the antenna voltage through the first power terminal and the second power terminal, increases a direct current (DC) level of the antenna voltage, rectifies the increased DC-level antenna voltage and provides a shifted rectified signal to the first node. The field monitor receives the antenna voltage through the first power terminal and the second power terminal, monitors a magnitude of the antenna voltage and generates the enable signal which is activated when the magnitude is smaller than a reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.