CPC G08C 17/02 (2013.01) [H04B 1/385 (2013.01)] | 14 Claims |
1. A tunable circuit for use in an implantable medical device, the tunable circuit comprising:
a current generator configured to produce an alternating electrical current containing a signal at or above 13 MHz suitable for electronic communications;
an antenna configured to receive the alternating electrical current and produce an alternating electromagnetic field representative of the signal and a level of ambient impedance;
a plurality of fixed impedances arranged between the antenna and the current generator; and
a variable impedance arranged in the same electrical circuit as the plurality of fixed impedances, the variable impedance capable of being operated to dynamically maintain a matching impedance based upon temporal changes in the level of ambient impedance, in combination with the plurality of fixed impedances,
wherein the level of ambient impedance varies based upon a detected impedance, a received signal strength indicator, or another physical parameter of a material surrounding the implantable medical device.
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