公开(公告)号：US20040104809A1

公开(公告)日：2004-06-03

申请号：US10712325

申请日：2003-11-12

Applicant: STMicroelectronics S.A.

Inventor： Pierre Rizzo ,  Jerome Conraux

IPC: H04Q005/22

CPC classification number: G06K19/0723

Abstract: An electromagnetic transponder intended to draw the power necessary to its operation of from a field radiated by a terminal of transmission of a carrier at a first supply frequency and to back-modulate the received signal at the rate of a sub-carrier at a second frequency lower than the first one, and comprising means capable of demodulating and decoding signals modulated by said sub-carrier, as well as a system of communication between such transponders.

Abstract translation: 一种电磁转发器，用于从第一电源频率的载波发射终端辐射的场中获取其工作所需的功率，并以第二频率以副载波的速率对接收信号进行后向调制 低于第一个，并且包括能够解调和解码由所述子载波调制的信号的装置以及这种应答器之间的通信系统。

公开(公告)号：US20030160650A1

公开(公告)日：2003-08-28

申请号：US10351601

申请日：2003-01-24

Applicant: STMicroelectronics S.A.

Inventor： Pierre Rizzo

IPC: H03D001/00

CPC classification number: G06K19/0723 ,  H03D1/18 ,  H03K5/082

Abstract: A demodulator for an amplitude modulated alternating signal includes a peak detection circuit for extracting the reference modulating signal from the amplitude modulated alternating signal, and a first translation circuit for offsetting the level of the reference modulating signal by a value equal to the DC component to obtain an offset reference modulated signal. A comparison threshold generator circuit generates a comparison threshold to locate the start and the end of the modulation, and a comparator circuit compares the offset reference modulating signal with the comparison threshold for providing signals that cross the comparison threshold. An unregulated supply circuit provides a supply voltage to the different circuits.

Abstract translation: 用于幅度调制交替信号的解调器包括用于从调幅交替信号中提取参考调制信号的峰值检测电路和用于将参考调制信号的电平抵消等于DC分量的值的第一平移电路，以获得 偏移参考调制信号。 比较阈值发生器电路产生比较阈值以定位调制的开始和结束，并且比较器电路将偏移参考调制信号与比较阈值进行比较，以提供跨越比较阈值的信号。 不稳定的电源电路为不同的电路提供电源电压。