Volentine, Whitt & Francos, PLLC
Reception circuit and near field communication (NFC) card including same
A reception circuit of an NFC card, includes, an input circuit, a reference voltage generator, a comparison circuit and a reference voltage controller. The input circuit receives a wireless signal including pauses and generates an envelope voltage signal. The reference voltage generator generates a detection reference voltage and a selection reference voltage based on the envelope voltage signal and a voltage selection signal. The selection reference voltage varies depending on a minimum voltage level of the pauses. The comparison circuit generates a pause detection signal and a synchronization signal by comparing the envelope voltage signal with the detection reference voltage the selection reference voltage, respectively. The reference voltage controller adjusts a control value of the voltage selection signal based on the pause detection signal and the synchronization signal such that the selection reference voltage is changed depending on the control value of the voltage selection signal.
Samsung Electronics Co., Ltd.
G G
G06K G06K
inventional inventional
Jun-Ho Kyeong-Do
Kim Kim