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    • 2. 发明授权
    • Optimized operation of a dense reader system
    • 优化操作的密集阅读器系统
    • US07969282B2
    • 2011-06-28
    • US11312606
    • 2005-12-21
    • Kevin J. PowellWilliam R. BandyMichael R. Arneson
    • Kevin J. PowellWilliam R. BandyMichael R. Arneson
    • H04Q5/22
    • H04W8/26G06K7/10356G06K7/10475H04W84/18H04W88/02
    • Methods, systems and apparatuses for RFID readers forming a reader network are described. In an aspect of the present invention, a plurality of RFID readers are configured to interrogate tags. Furthermore, the readers are configured to communicate with one another. Each of the readers include a ID number which identifies that particular reader within a reader network during communications. Each reader includes a network interface module and an optimization module to receive and process statistical data obtained from other readers in the network. Aspects of the present invention include a ‘primary/secondary’ reader network configuration, as well as a ‘distributed elements’ reader network configuration. A set of operational rules for the environment is indicated, and tag interrogations are optimized according to the rules. Readers may communicate according to a “Listen Before Talk” (LBT) protocol to avoid undesirable interference. Individual readers are capable of dynamically establishing and joining a network, and leaving the network in a self-configured and semi-autonomous or autonomous manner.
    • 描述了形成读取器网络的RFID阅读器的方法,系统和装置。 在本发明的一个方面,多个RFID阅读器配置成询问标签。 此外,读取器被配置为彼此通信。 每个读取器包括识别通信期间读取器网络内的特定读取器的ID号码。 每个读取器包括网络接口模块和优化模块,用于接收和处理从网络中的其他读取器获得的统计数据。 本发明的方面包括“主/次”读取器网络配置以及“分布式元件”读取器网络配置。 指出了一套环境的操作规则,根据规则优化了标签询问。 读者可以根据“听即播”(LBT)协议进行通信,以避免不必要的干扰。 个人读者能够动态建立和加入网络,并使网络处于自配置和半自主或自主的方式。
    • 4. 发明授权
    • Identification tag utilizing charge pumps for voltage supply generation and data recovery
    • 识别标签利用电荷泵进行电压发生和数据恢复
    • US06734797B2
    • 2004-05-11
    • US10072985
    • 2002-02-12
    • Wayne E. ShanksWilliam R. BandyMichael R. ArnesonKevin J. Powell
    • Wayne E. ShanksWilliam R. BandyMichael R. ArnesonKevin J. Powell
    • G08B1314
    • G06K19/07749G06K7/0008G06K7/10039G06K7/10069G06K7/10108G06K7/10356G06K17/00G06K19/0713G06K19/0723G06K19/07767G08B13/2485G11C5/142H04L7/0331
    • An identification (ID) tag includes a substrate having an input capable of receiving a high frequency signal. For instance, the high frequency signal can be a radio frequency (RF) signal that is generated as part of a radio frequency (RF) ID system. A first charge pump is coupled to the input and is configured to convert the high frequency signal to a substantially direct current (DC) voltage. A data recovery circuit is coupled to the input and is capable of recovering data from the high frequency signal. A back scatter switch is coupled to the input and is capable of modifying an impedance of the input, responsive to a control signal. A state machine is disposed on the substrate and is responsive to the data recovered by the second charge pump, where the state machine is capable of generating the control signal for the back scatter switch in response to the data. The DC voltage from the first charge pump is capable of providing a voltage supply for at least one of the data recovery circuit, the back scatter switch, and the state machine. The data recovery circuit includes a second charge pump that is capable of operating on the high frequency signal simultaneously with the first charge pump. In other words, the first charge pump can generate the supply voltage for the ID tag from the high frequency signal, while the second charge pump simultaneously retrieves the data from the high frequency signal. The first charge pump also includes a means for limiting the amplitude of the DC voltage by reducing the charge pump efficiency, once a threshold voltage is reached.
    • 识别(ID)标签包括具有能够接收高频信号的输入的基板。 例如,高频信号可以是作为射频(RF)ID系统的一部分而生成的射频(RF)信号。 第一电荷泵耦合到输入端并被配置为将高频信号转换成基本上直流(DC)的电压。 数据恢复电路耦合到输入端并且能够从高频信号中恢复数据。 背散射开关耦合到输入端,并且能够响应于控制信号来修改输入的阻抗。 状态机设置在基板上并且响应于由第二电荷泵恢复的数据,其中状态机能够响应于数据而产生用于背散射开关的控制信号。 来自第一电荷泵的DC电压能够为数据恢复电路,后向散射开关和状态机中的至少一个提供电压源。 数据恢复电路包括能够与第一电荷泵同时对高频信号进行操作的第二电荷泵。 换句话说,第一电荷泵可以从高频信号产生ID标签的电源电压,而第二电荷泵同时从高频信号中检索数据。 第一电荷泵还包括一旦达到阈值电压,则通过降低电荷泵效率来限制直流电压的振幅的装置。