公开(公告)号：US20140077869A1

公开(公告)日：2014-03-20

申请号：US14090843

申请日：2013-11-26

Applicant: STMicroelectronics (Rousset) SAS

Inventor： Gilles Bas ,  Christophe Moreaux ,  Gary Seigneuret

IPC: G05F1/10

CPC classification number: G05F1/10 ,  G06K19/0713

Abstract: An electromagnetic transponder includes an antenna circuit, a load, and a charge pump transistor having a current path coupled between the antenna circuit and the load. During operation, a retromodulated signal is transmitted at a first level by biasing the charge pump transistor during a first time period such that an impedance of the antenna circuit has a first impedance value and current flows from the antenna circuit to the load. A retromodulated signal at a second level is transmitted by biasing the charge pump transistor during a second time period such that the impedance of the antenna circuit has a second impedance value different than the first impedance value and current flows from the antenna circuit to the load. The retromodulated signals are transmitted at the first and second levels in a sequence determined to transmit information from the electromagnetic transponder.

Abstract translation: 电磁应答器包括天线电路，负载和电荷泵晶体管，其具有耦合在天线电路和负载之间的电流路径。 在操作期间，通过在第一时间段期间偏置电荷泵晶体管，以使得天线电路的阻抗具有第一阻抗值并且电流从天线电路流向负载，通过在第一电平上传输重新校正的信号。 通过在第二时间段期间偏置电荷泵晶体管来传输第二电平的重新调制信号，使得天线电路的阻抗具有与第一阻抗值不同的第二阻抗值，并且电流从天线电路流向负载。 重新校正的信号以确定为从电磁应答器发送信息的顺序在第一和第二电平处发送。

公开(公告)号：US08896368B2

公开(公告)日：2014-11-25

申请号：US14090843

申请日：2013-11-26

Applicant: STMicroelectronics (Rousset) SAS

Inventor： Gilles Bas ,  Christophe Moreaux ,  Gary Seigneuret

IPC: G05F1/10

CPC classification number: G05F1/10 ,  G06K19/0713

Abstract: An electromagnetic transponder includes an antenna circuit, a load, and a charge pump transistor having a current path coupled between the antenna circuit and the load. During operation, a retromodulated signal is transmitted at a first level by biasing the charge pump transistor during a first time period such that an impedance of the antenna circuit has a first impedance value and current flows from the antenna circuit to the load. A retromodulated signal at a second level is transmitted by biasing the charge pump transistor during a second time period such that the impedance of the antenna circuit has a second impedance value different than the first impedance value and current flows from the antenna circuit to the load. The retromodulated signals are transmitted at the first and second levels in a sequence determined to transmit information from the electromagnetic transponder.

Abstract translation: 电磁应答器包括天线电路，负载和电荷泵晶体管，其具有耦合在天线电路和负载之间的电流路径。 在操作期间，通过在第一时间期间偏置电荷泵晶体管，以使得天线电路的阻抗具有第一阻抗值并且电流从天线电路流向负载，通过在第一电平上传输重新校正的信号。 通过在第二时间段期间偏置电荷泵晶体管来传输第二电平的重新调制信号，使得天线电路的阻抗具有与第一阻抗值不同的第二阻抗值，并且电流从天线电路流向负载。 重新校正的信号以确定为从电磁应答器发送信息的顺序在第一和第二电平处发送。