Patent ID: 9634729
Date: 2017-04-25
CPC Classifications: H04B,H04L

Claim:
1. A demodulator for a near field communication (NFC), the demodulator comprising: a first rectifier configured to receive an antenna voltage through a first power terminal and a second power terminal, configured to rectify the antenna voltage and configured to provide a first rectified signal to a first node; a shifting rectifier configured to be enabled in response to an enable signal, configured to receive the antenna voltage through the first power terminal and the second power terminal, configured to increase a direct current (DC) level of the antenna voltage, configured to rectify the increased DC-level antenna voltage and configured to provide a shifted rectified signal to the first node; a field monitor configured to receive the antenna voltage through the first power terminal and the second power terminal, configured to monitor a magnitude of the antenna voltage and configured to generate the enable signal which is enabled when the magnitude is smaller than a reference value; and an edge detector configured to generate input data corresponding to the antenna voltage based on at least one of the first rectified signal and the shifted rectified signal at the first node.