This three-part article focuses on power and data telemetry for implantable medical
devices (IMDs). It is not restricted to
circuit and system descriptions but outlines
the background of the application,
along with typical requirements, to illuminate why the circuits
are being built as described in state-of-the-art publications.
In order to adequately cover this wide range of topics,
the article has been split into three parts. In the first part,
we reviewed tissue properties, regulations, standards, and
safety limits for EM and optical telemetry and its application
to the human body. This second part focuses on power telemetry,
with an emphasis on the inductive link and the corresponding
power management circuits, and gives a short
overview of more recent advances such as energy harvesting
for IMDs. The third and last part will be dedicated to
data telemetry concepts for IMDs. These will be reviewed in
principle, then split mostly into electromagnetic and optical
approaches. To conclude, an example of a system realizing some of the aforementioned ideas will
be provided.