Method and apparatus for telemetering data bidirectionally between two devices, one device incorporating a coarse phase adjustment and the other device incorporating a fine phase adjustment
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United States of America Patent
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Jun 23, 1998
Grant Date -
N/A
app pub date -
Jul 2, 1996
filing date -
Jul 2, 1996
priority date (Note) -
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Abstract
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.degree.. This selective 180.degree. adjustment enables the programmer's phase-locked loop receiver to have a reduced, .+-.90.degree. pull-in range, which simplifies its construction and reduces the time required to achieve synchronization.
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