Semiconductor integrated circuit device and contactless IC card,申请号US20050028043-传众专利搜索

Semiconductor integrated circuit device and contactless IC card

申请公布号：US2005173542(A1)

申请号：US20050028043

申请日期：2005.01.04

申请公布日期：2005.08.11

申请人：

WATANABE KAZUKI;NAKADAI YUTAKA;OZAWA SHINICHI

发明人：WATANABE KAZUKI;NAKADAI YUTAKA;OZAWA SHINICHI

分类号：G06K19/06;G06K19/07;(IPC1-7):G06K19/06

主分类号：G06K19/06

摘要：The disclosed invention provides a semiconductor integrated circuit device (IC) and a contactless IC card including a receiver circuit that is able to stably demodulate information signals superimposed on AC signals from an interrogator. The receiver circuit included in the IC is equipped with antenna terminals, a power supply circuit, and a filter circuit. The information signal from which a high frequency component was eliminated through the filter circuit is input via a capacitor to an inverting input terminal of an operational amplifier and a reference voltage is input to a non-inverting input terminal thereof. After the information signal is fed back through a feedback path to the non-inverting input terminal of the operational amplifier, that signal is amplified and the amplified information signal is binarized by a binarizing circuit, thereby data transmitted from the interrogator is demodulated. The contactless IC card comprises an antenna coil and the IC including this receiver circuit.