| 摘要 |
An improved system is disclosed for telemetering data bidirectionally between two devices such as an implantable device and an external programmer. The two devices both include clock generators that operate at the same nominal frequency, but only one of the devices (i.e., the programmer) includes a phase-locked loop receiver that adjusts the frequency and phase of its clock signal to match that of the received data. The clock generator of the other device (i.e., the implantable device) generates a fixed-phase clock signal, which is selectively inverted or not inverted, to adjust its phase by 180 DEG . This selective 180 DEG adjustment enables the programmer's phase-locked loop receiver to have a reduced, +/-90 DEG pull-in range, which simplifies its construction and reduces the time required to achieve synchronization.
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