Patent ID: 7138699
Filing Date: 2006-11-21
Classification: G06K,H02J

Abstract:
1. A semiconductor integrated circuit comprising: a supply voltage generator for rectifying a signal received by an antenna coil and generating a supply voltage set at a predetermined voltage by a regulator; and a demodulator, wherein the demodulator comprises: a demodulation circuit for demodulating an input signal and outputting the demodulated input signal; a resistor whose one end is connected to one end of the antenna coil; a diode whose anode is connected to the other end of the resistor and whose cathode is connected to a node located to the input end of the demodulation circuit; a first capacitance connected between a node at which the resistor and the diode are connected to each other and a grounding conductor; and a second capacitance connected between a node at which the diode and the demodulation circuit are connected to each other and a grounding conductor.