Powering and Communicating with mm-size implants

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Powering and Communicating with mm-size implants

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Power sources for implants

Electromagnetic power transfer
10 to 1000 W/sq.mm
EM field radiated by transmitter in vitro.
Antenna in vivo receives EM energy.
Rectifier & regulator produce DC voltage.

Electromagnetic Power Transfer

Antenna
Size considerations.
Optimum frequency.

Safety consideration-
SAR-Specific Absorption Rate
A measure of the rate at which energy is absorbed by the body when exposed to a radio frequency (RF) electromagnetic field .
1.6W/kg averaged over 1g of tissue.

Advantages.

More power density-10 to 1000 W/sq.mm.
No moving parts.
No chemical processing.
Less size.
CMOS rectifier-more efficient.