IEEE Solid-States Circuits Magazine - Fall 2021 - 33

particularly as the circuits scale to
lower average power [11].
A few key trends have led to our
work. For one, the average power demands
of CMOS technology have been
decreasing, now reaching the nanowatt
level thanks to advanced design techniques
and technology improvements,
enabling a wider array of harvesters.
Next, advances in material design and
packaging have demonstrated fully
passive gastric devices that are small
enough to be swallowed, but then unfold
after ingestion to remain up to seven
days in the stomach for long-term
drug delivery. Such devices could one
day provide an ingestible, noninvasive
platform for active wireless electronic
sensors that perform long-term, in
vivo vital signs monitoring. Finally, interest
in biocompatible galvanic cells
is rising, with a focus on 1) transient
electronics that fully disappear at the
end of their tasks, 2) electrolytes that
are supplied on demand to extend
the shelf life of the cell, 3) material
selection for fully biocompatible and
Antenna
Tunable Matching
Reconfigurable
LDO
EH
Tx
Rx
Logic
1 mm
FIGURE 10: μmedIC's diephoto. A 1×1-mm2 CMOS chip was fabricated in a 65-nm CMOS
process and integrated with a custom microstrip printed antenna on a flexible printed circuit
board. LDO: low dropout; Rx: receiver; Tx: transmitter.
vRF+
C
C
...
Vdc
CL RL
...
...
C
vRF-
(a)
vRF+
C
C
...
Vdc
CL RL
...
...
C
vRF-
(b)
FIGURE 11: A programmable matching cross-coupled rectifier. The radio-frequency front end of the rectifier employs a programmable bank
of passive elements to reprogram the input impedance. (a) A conventional cross-coupled rigid rectifier architecture, and (b) a reconfigurable
rectifier front-end.
IEEE SOLID-STATE CIRCUITS MAGAZINE
FALL 2021
33
C
C
...
C
C
C
...
C
1 mm

IEEE Solid-States Circuits Magazine - Fall 2021

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Fall 2021

Contents
IEEE Solid-States Circuits Magazine - Fall 2021 - Cover1
IEEE Solid-States Circuits Magazine - Fall 2021 - Cover2
IEEE Solid-States Circuits Magazine - Fall 2021 - Contents
IEEE Solid-States Circuits Magazine - Fall 2021 - 2
IEEE Solid-States Circuits Magazine - Fall 2021 - 3
IEEE Solid-States Circuits Magazine - Fall 2021 - 4
IEEE Solid-States Circuits Magazine - Fall 2021 - 5
IEEE Solid-States Circuits Magazine - Fall 2021 - 6
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IEEE Solid-States Circuits Magazine - Fall 2021 - Cover3
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