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    • 86. 发明授权
    • RF telemetry receiver circuit for active medical implants
    • 用于主动医疗植入物的RF遥测接收器电路
    • US08963737B2
    • 2015-02-24
    • US13536492
    • 2012-06-28
    • Alaa Makdissi
    • Alaa Makdissi
    • G08C19/16H04B1/22A61N1/372
    • H04B1/1027A61N1/362A61N1/37223A61N1/3727A61N1/37276H04B1/22
    • An RF telemetry receiver circuit for active implantable medical devices. The baseband binary signal (Db) is doubly modulated by a low frequency carrier (Fm) and by a high frequency carrier (Fc). The receiver circuit is a semi-passive non heterodyne circuit, devoid of a local oscillator and mixer. It comprises an antenna (104), a passive bandpass filter (108) centered on the high-frequency carrier (Fc), a passive envelope detector (120-126) and a, digital demodulator (116). The envelope detector comprises a first diode circuit (120) of non-coherent detection, an active bandpass filter (122) centered on a frequency (2.Fm) twice the low frequency carrier and having a bandwidth (2.Db) twice the baseband bandwidth, and a second diode circuit (124) of non-coherent detection, outputting a baseband signal applied to the digital demodulation stage (116).
    • 一种用于主动植入式医疗设备的RF遥测接收器电路。 基带二进制信号(Db)被低频载波(Fm)和高频载波(Fc)双重调制。 接收器电路是半无源非外差电路,没有本地振荡器和混频器。 它包括天线(104),以高频载波(Fc)为中心的无源带通滤波器(108),无源包络检测器(120-126)和数字解调器(116)。 包络检测器包括非相干检测的第一二极管电路(120),以低于两倍于低频载波的频率(2.Fm)为中心的有源带通滤波器(122),并具有基带的两倍的带宽(2.Db) 带宽和非相干检测的第二二极管电路(124),输出施加到数字解调级(116)的基带信号。
    • 87. 发明授权
    • Spread spectrum demodulator employing frequency detection
    • 采用频率检测的扩频解调器
    • US07477679B2
    • 2009-01-13
    • US10983645
    • 2004-11-09
    • Koutaro Mizuno
    • Koutaro Mizuno
    • H04B1/05H04B1/22H04L27/06H04L27/10H04L27/148H03D1/04
    • H04L27/22H04B1/707
    • A simplified spread spectrum demodulator uses a frequency detector to demodulate a modulated spread spectrum signal to obtain successive chip values. A correlation unit correlates the successive chip values with fixed sequences of correlation coefficients to generate correlation values. A decision circuit selects one of the correlation values to decide what symbol the spread spectrum signal represents. The correlation coefficients are obtained by applying the same modulation method as used to modulate the spread spectrum signal, and then the same demodulation method as used by the frequency detector, to the sequences of chips representing different symbols. Since synchronous detection is not employed, no carrier recovery circuit is needed.
    • 简化的扩频解调器使用频率检测器来解调调制扩频信号以获得连续的码片值。 相关单元将连续的码片值与固定的相关系数序列相关联,以产生相关值。 判定电路选择相关值之一来决定扩频信号表示的符号。 通过应用与调制扩展频谱信号相同的调制方法,然后将与频率检测器相同的解调方法应用于表示不同符号的码片序列,获得相关系数。 由于不采用同步检测,因此不需要载波恢复电路。
    • 90. 发明授权
    • Low level RF threshold detector
    • 低电平RF阈值检测器
    • US5479160A
    • 1995-12-26
    • US130630
    • 1993-10-01
    • Alfred R. Koelle
    • Alfred R. Koelle
    • G01V3/00G01V15/00G06K19/07H04B1/59H04B5/00H04B1/22
    • G06K19/0723
    • A low power circuit which detects low level RF signals and RF signals of varying strength and, upon detection, activates or "wakes up" RF equipment, such as an automatic vehicle identification tag, that is normally kept in a dormant state to conserve operating power between active operations. The circuit converts a detected RF signal from a dc voltage signal to an ac voltage signal by "chopping" the dc signal to a "chopped dc" square wave, the amplitude of which is proportional to that of the original dc signal voltage, which in turn is proportional to the level of the received RF signal. The chopped dc square wave is then linearly combined with a threshold reference level signal of opposite polarity and the combined signals form the input to an ac-coupled limiting amplifier. The polarity of the amplified signal is identical to that of the larger of its two input signals. A phase detector determines the polarity of the amplified signal. When the phase detector discerns the detected RF activation signal, it activates the RF equipment.
    • 一种低功率电路,用于检测不同强度的低电平RF信号和RF信号,并且在检测时激活或“唤醒”RF设备,例如自动车辆识别标签,其通常处于休眠状态以节省操作功率 在活动操作之间。 该电路将检测到的RF信号从直流电压信号转换为交流电压信号,通过将直流信号“斩波”为“斩波直流”方波,其幅度与原始直流信号电压成正比, 转动与接收到的RF信号的电平成比例。 然后将切断的直流方波与具有相反极性的阈值参考电平信号线性组合,并且组合信号形成到交流耦合限幅放大器的输入。 放大信号的极性与其两个输入信号中的较大者的极性相同。 相位检测器确定放大信号的极性。 当相位检测器识别检测到的RF激活信号时,它激活RF设备。