公开(公告)号：US20140106668A1

公开(公告)日：2014-04-17

申请号：US13649801

申请日：2012-10-11

Applicant: QUALCOMM INCORPORATED

Inventor： Koushik KRISHNAN ,  Rainer GAETHKE ,  Faramarz SABOURI

IPC: H04B5/00

CPC classification number: G06K7/0008 ,  G06K7/10128 ,  H04B5/0031 ,  H04B5/0075 ,  H04B17/12

Abstract: A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and a capacitance of the matching network is varied. A parameter is measured while varying the capacitance of the matching network and while applying the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.

Abstract translation: 近场通信（NFC）设备包括NFC天线，耦合到NFC天线的匹配网络和耦合到匹配网络的发射机。 发射机向匹配网络施加信号，匹配网络的电容变化。 在改变匹配网络的电容和应用信号的同时测量参数。 识别参数的峰值并将其与阈值进行比较。 响应于峰值满足阈值的确定来启动通信协议。