In this work, we developed a novel power supply for
the WIMS-ERC
(Wireless Integrated Microsystems - Engineering
Research Center,
Ann Arbor, MI) intraocular sensor (WIMS-IOS), an
autonomous and
implantable system. This device is representative of
a broad class of
microscale devices, whose full implementation in
environmental and
medical systems will require significantly smaller
power supplies;
presently, battery systems represent 85% mass and 50%
volume of
typical devices and they have intrinsically high
power (3.5-4.2V)
based on lithium chemistry which complicates
integration with low-
voltage MEMS, since it necessitates voltage
regulation. Our
underlying hypothesis was that selection of the optimum
electrochemistry and usage of physical vapor
deposition would
reduce intrinsic losses because of the high resulting
precision, while
allowing integration with chips because of more
benign processing
conditions to MEMS. They also offer potentially lower
cost than
existing systems.
the WIMS-ERC
(Wireless Integrated Microsystems - Engineering
Research Center,
Ann Arbor, MI) intraocular sensor (WIMS-IOS), an
autonomous and
implantable system. This device is representative of
a broad class of
microscale devices, whose full implementation in
environmental and
medical systems will require significantly smaller
power supplies;
presently, battery systems represent 85% mass and 50%
volume of
typical devices and they have intrinsically high
power (3.5-4.2V)
based on lithium chemistry which complicates
integration with low-
voltage MEMS, since it necessitates voltage
regulation. Our
underlying hypothesis was that selection of the optimum
electrochemistry and usage of physical vapor
deposition would
reduce intrinsic losses because of the high resulting
precision, while
allowing integration with chips because of more
benign processing
conditions to MEMS. They also offer potentially lower
cost than
existing systems.