Communicating with an implanted wireless sensor

Details Communicating with an implanted wireless sensor Communicating with an implanted wireless sensor

2007-03-14

2008-12-16

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C324S076520, C324S601000

Reexamination Certificate

active

07466120

ABSTRACT:
Aspects of the present invention determine the resonant frequency of a sensor by obtaining sensor signals in response to three energizing signals, measuring the phase of each sensor signal, and using a group phase delay to determine the resonant frequency. The phase difference between the first and second signal is determined as a first group phase delay. The phase difference between the second and third signal is determined as a second group phase delay. The first group phase delay and second group phase delay are compared. Based on the comparison, the system may lock on the resonant frequency of the sensor or adjust a subsequent set of three energizing signals.

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