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    • 22. 发明授权
    • Battery assisted RFID tag with square-law receiver and optional part time active behavior
    • 电池辅助RFID标签与平方律接收器和可选的兼职活动行为
    • US09367711B1
    • 2016-06-14
    • US12204774
    • 2008-09-04
    • Farron DacusJoseph BouchezJohannes Albertus van NiekerkAlfonso Rodriguez
    • Farron DacusJoseph BouchezJohannes Albertus van NiekerkAlfonso Rodriguez
    • H04Q5/22G06K7/00G06K19/077
    • G06K7/0008G06K19/0702G06K19/07749
    • Embodiments of the present invention provide RFID systems having battery-assisted, Semi-Passive RFID tags that operate with sensitive transistor based square law tag receivers utilizing a plurality of tag receiver dynamic range states. Embodiments of the present invention are also enhanced with receiver training and synchronizing methods suited to the high tag sensitivity and need for dynamic range state switching. These enhancements may employ pseudo-random sequence based receiver training, activation signaling, and frame synchronizing. Further enhancement is achieved via design of system command sets and tag state machine behavior that control system interference and allow maximum usage of high sensitivity. Command set design also allows for convenient expansion to active transmitters and receivers in tags operating within the same system. Additional enhancement attained via power leveling methods that optimize the amount of transmitted power and interference from a reader in relation to the sensitivity of the RFID tags, their ranges from the reader, and the unique physics of the backscatter RFID radio link.
    • 本发明的实施例提供具有电池辅助的半无源RFID标签的RFID系统,其利用多个标签接收器动态范围状态使用基于灵敏晶体管的平方律标签接收器进行操作。 本发明的实施例还通过适用于高标签灵敏度的接收机训练和同步方法以及对动态范围状态切换的需要而增强。 这些增强可以采用基于伪随机序列的接收机训练,激活信令和帧同步。 通过设计系统命令集和标签状态机行为来实现进一步的增强,可以控制系统的干扰并允许最大限度地使用高灵敏度。 命令集设计还允许在同一系统内操作的标签中方便地扩展到主动发射机和接收机。 通过功率调整方法获得的附加增强,其优化了与RFID标签的灵敏度相关的发送功率和干扰的量级,读取器的范围以及反向散射RFID无线电链路的独特物理学特性。
    • 24. 发明授权
    • Automatic gain control and baseband preintegration to reduce computation requirements at lower data rates
    • 自动增益控制和基带预集成,以降低数据速率下的计算需求
    • US09224016B2
    • 2015-12-29
    • US13165740
    • 2011-06-21
    • Dean Kawaguchi
    • Dean Kawaguchi
    • H04L27/00G06K7/00G06K19/07
    • G06K7/0008G06K19/0723H04Q2213/13095
    • A method for processing baseband signals according to one embodiment includes receiving I and Q baseband signals; and selectively reducing an amount of samples of the baseband signals to be processed in a correlator, wherein the reduction rate is based on a data rate of the baseband signals. A preintegrator module according to one embodiment includes an automatic gain control section for performing automatic gain control on I and Q baseband signals; a first preintegrator coupled to an output of the automatic gain control section, the first preintegrator being for selectively reducing an amount of samples in the I baseband signal based on a data rate of the I baseband signal; and a second preintegrator coupled to an output of the automatic gain control section, the second preintegrator being for selectively reducing an amount of samples in the Q baseband signal based on a data rate of the Q baseband signal. Additional systems and methods are also presented.
    • 根据一个实施例的用于处理基带信号的方法包括:接收I和Q基带信号; 并且在相关器中选择性地减少要处理的基带信号的采样量,其中所述减小率基于所述基带信号的数据速率。 根据一个实施例的预积分器模块包括用于对I和Q基带信号执行自动增益控制的自动增益控制部分; 第一预分解器,耦合到自动增益控制部分的输出,第一预分解器用于基于I基带信号的数据速率选择性地减少I基带信号中的采样量; 以及耦合到所述自动增益控制部分的输出的第二预先整合器,所述第二预分组器用于基于所述Q基带信号的数据速率来选择性地减少所述Q基带信号中的采样量。 还介绍了其他系统和方法。
    • 26. 发明授权
    • RF device with tamper detection
    • 具有篡改检测的RF设备
    • US09082057B2
    • 2015-07-14
    • US12806748
    • 2010-08-19
    • Michael McGregor
    • Michael McGregor
    • H04Q5/22G06K19/073
    • G06K19/07372H04Q2213/13095
    • A Radio Frequency Identification (RFID) system according to one embodiment includes communication circuitry for enabling wireless communication with an RF reader; energy harvesting circuitry for generating an electric current from RF energy; a sensor loop coupled to the energy harvesting circuitry; and a status register coupled to the sensor loop for indicating a broken or unbroken status of the sensor loop. A method according to one embodiment includes generating an electric current in a Radio Frequency Identification (RFID) device, the current energizing a sensor loop; detecting a status of whether the sensor loop is broken or unbroken; storing the status in at least one of a status register and a nonvolatile memory; receiving a query from an RFID reader for the status; and sending the status to the RFID reader.
    • 根据一个实施例的射频识别(RFID)系统包括用于实现与RF读取器的无线通信的通信电路; 用于从RF能量产生电流的能量收集电路; 耦合到所述能量收集电路的传感器回路; 以及耦合到传感器回路的状态寄存器,用于指示传感器回路的断开或不间断的状态。 根据一个实施例的方法包括在射频识别(RFID)设备中产生电流,电流激励传感器回路; 检测传感器环路是否断裂或不间断的状态; 将状态存储在状态寄存器和非易失性存储器中的至少一个中; 从RFID读取器接收查询状态; 并将状态发送到RFID读取器。
    • 28. 发明授权
    • Long range RFID device for battery monitoring and systems implementing same
    • 用于电池监控的远程RFID设备及其实施的系统
    • US08941496B2
    • 2015-01-27
    • US11619581
    • 2007-01-03
    • Naresh Batra
    • Naresh Batra
    • G08B21/00H04W52/02G06K19/07G06K19/077
    • H04W52/0261G06K19/0716G06K19/07749H04W52/0277Y02D70/166
    • An RFID system according to one embodiment includes an electronic device being powered by a battery; an RFID device in electrical communication with the electronic device; and a mechanism for estimating a remaining potential energy of the battery, wherein a flag is set on the RFID device when an estimated remaining potential energy of the battery is below a predefined threshold. In an RFID system according to another embodiment, the RFID device stores an indication of a condition of the battery powering the electronic device. An RFID device according to yet another embodiment of the invention includes an interface for providing a direct physical connection to an electronic device that is powered by a battery; a memory for storing an indication of a condition of the battery powering the electronic device; and circuitry for sending the indication stored in the memory to a remote device via an air interface.
    • 根据一个实施例的RFID系统包括由电池供电的电子设备; 与所述电子设备电通信的RFID设备; 以及用于估计电池的剩余势能的机构,其中当电池的估计剩余电势低于预定阈值时,在RFID装置上设置标志。 在根据另一实施例的RFID系统中,RFID设备存储为电子设备供电的电池的状态的指示。 根据本发明的另一个实施例的RFID设备包括用于向由电池供电的电子设备提供直接物理连接的接口; 用于存储为电子设备供电的电池的状态的指示的存储器; 以及用于经由空中接口将存储在存储器中的指示发送到远程设备的电路。
    • 30. 发明授权
    • Devices employing delay matching to mitigate local oscillator noise and methods thereof
    • 采用延迟匹配来减轻本地振荡器噪声的装置及其方法
    • US08766775B2
    • 2014-07-01
    • US12814072
    • 2010-06-11
    • Edward M. FarrellPrasad Panchalan
    • Edward M. FarrellPrasad Panchalan
    • H04Q5/22
    • G06K7/10009
    • In one embodiment, a Radio Frequency Identification (RFID) reader circuit includes a Radio Frequency (RF) source, a RF power amplifier coupled to an output of the RF source in a transmitting path, a first RF bandpass filter coupled between the output of the RF source and a mixer module, and a low noise amplifier in a receiving path being coupled to an input of a second RF bandpass filter. The mixer module receives a signal from the first RF bandpass filter and a signal from the second RF bandpass filter, the mixer module multiplies the signal from the first RF bandpass filter with the signal from the second RF bandpass filter to recover the backscatter sidebands in the signal from the second RF bandpass filter, and the first and second RF bandpass filters provide identical or nearly identical delay of signals. Other systems, methods and circuits are also described.
    • 在一个实施例中,射频识别(RFID)读取器电路包括射频(RF)源,耦合到发射路径中的RF源的输出​​的RF功率放大器,耦合在 RF源和混频器模块,以及耦合到第二RF带通滤波器的输入的接收路径中的低噪声放大器。 混频器模块接收来自第一RF带通滤波器的信号和来自第二RF带通滤波器的信号,混频器模块将来自第一RF带通滤波器的信号与来自第二RF带通滤波器的信号相乘,以恢复来自第二RF带通滤波器的反向散射边带 来自第二RF带通滤波器的信号,并且第一和第二RF带通滤波器提供相同或几乎相同的信号延迟。 还描述了其它系统,方法和电路。