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2. 发明授权

US06456887B1 Low energy consumption RF telemetry control for an implantable medical device 失效
标题翻译：用于可植入医疗设备的低能耗RF遥测控制
公开(公告)号：US06456887B1
公开(公告)日：2002-09-24
申请号：US09736625
申请日：2000-12-14
申请人： Charles H. Dudding , Gregory J. Haubrich
发明人： Charles H. Dudding , Gregory J. Haubrich
IPC分类号： G08C1702
CPC分类号： A61N1/37276 , A61N1/37252 , A61N1/3727
摘要： In an implantable medical device, a frequency synthesizer employed in the RF transceiver of the IMD operating system functions in a PLL LOCK mode wherein the VCO frequency is governed by the PLL and an energy saving HOLD mode wherein the PLL is not operational and the VCO generated carrier frequency can drift over time. The PLL circuit is powered up and coupled with a control voltage input and the output of the VCO to develop a frequency control voltage stored by a capacitive loop filter during initial LOCK portions of both uplink and downlink telemetry transmission time periods. A frequency modulation (FM) input of the VCO receives data bit modulation voltages that modulates the carrier frequency during uplink transmission of patient data. During the HOLD portion of a downlink telemetry transmission, an AFC algorithm is enabled and derives a frequency correction value from the difference in frequency of the constant received carrier frequency and the drifting VCO generated carrier frequency, and the frequency correction value is applied to the VCO FM input to compensate for loop filter capacitor discharge of the control voltage causing the drift. The AFC algorithm derived frequency correction value is stored in memory and is also applied during the HOLD portion of an uplink telemetry transmission to the VCO FM input to compensate for loop filter capacitor discharge of the control voltage causing the drift. In addition, a recharge current is applied to the capacitive loop filter.
摘要翻译：在可植入医疗设备中，在IMD操作系统的RF收发器中使用的频率合成器以PLL锁定模式工作，其中VCO频率由PLL控制，并且节能HOLD模式，其中PLL不工作，并且VCO产生载波频率随时间漂移。 PLL电路上电并与控制电压输入和VCO的输出耦合，以在上行链路和下行链路传输时间段的初始LOCK部分期间开发由电容性环路滤波器存储的频率控制电压。 VCO的频率调制（FM）输入接收在患者数据的上行链路传输期间调制载波频率的数据比特调制电压。在下行链路遥测传输的HOLD部分期间，启用AFC算法，并且根据恒定接收载波频率和漂移VCO产生的载波频率的差异导出频率校正值，并且将频率校正值应用于VCO FM输入补偿环路滤波电容放电的控制电压导致漂移。 AFC算法导出的频率校正值存储在存储器中，并且在上行链路遥测传输的HOLD部分期间也施加到VCO FM输入端，以补偿导致漂移的控制电压的环路滤波电容放电。此外，充电电流被施加到电容性环路滤波器。

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