IEEE Solid-States Circuits Magazine - Fall 2020 - 40

and other matching circuitry on a
flexible printed circuit board (PCB).

Digital PPG-Based Monitor
As opposed to a well-controlled medical setting, biosignal acquisition in
a dynamic environment, such as a
home or an office, has been quite challenging. The signals degrade due to
many hard-to-control factors, including motion artifacts, poor sensor
interfaces, environmental noise such
as power line coupling, and ambient
light. These external artifacts place

demanding design specifications that
are necessary for any wearable de--
vices. Work presented in [47] proposed a multimodal biosensing SoC
that enables a reliable PPG-based
monitor sensor for live-use scenarios. The PPG readout has a dynamic
range of 130 dB, which, according to
the authors' best knowledge, is 11 dB
higher than any reported contemporary device; hence, it is capable of tolerating strong ambient light.
The digital transimpedance amplifier (TIA)-based approach in this article

PPG LEDs and Photodiode

Low Number of
Components

Temperature

Electrodes

Sensors

SoC

Readouts for
Data Collection

Storage

Interface

NTC

Sound
ECG
BIOZ

Wired
Temperature
ECG BIOZ
Sound

PPG

PPG

Processing

01010101

Security

Single Power
Source

Data and
Application

Wireless
Power Management
Harvesting

Charging

LDO(s)

dc-dc
Converters

achieves the reported dynamic range
with no dc-serve loop requirement
in a dc-cancellation digital-to-analog
(DAC) converter. Its noise components
are akin to a conventional TIA, without added ADC noise. The conversion
is processed in the digital domain,
enabling relatively easy digital signal process of the acquired data. The
architecture of the front end (FE) is
presented in Figure 8.

PPG-Based Monitor Dedicated to
Neonatal ICU Babies
A battery-free, wireless vital sign
monitoring system, with a soft and
noninvasive interface, has been proposed in [20]. The so-called epidermal electronic system (EES) uses a
binodal pair of ultrathin modules, a
PPG sensor, and an ECG sensor. The
PPG EES consists of a pair of LEDs
(red and infrared), a PD, wireless
power circuits, an LED driver, an
inverting amplifier, analog circuits,
and a near-field communication
(NFC) SoC. A 14-b ADC digitizes the
captured signals. The RF capabilities serve the dual purpose of data
communication and power transfer.
One should note that all the electronic components deployed in [20]
are off the shelf. The system diagram is exhibited in Figure 9.
The PPG EES is mounted on an
infant's foot. The patch is designed
such that van der Waals forces are
strong enough to adhere to the delicate infant skin, with a minimal thermal load and mechanical strain. The
encapsulation is water resistant,
improving system robustness. Water
resistance is necessary, as neonatal
ICU incubators have a humidity setting of 80% to maintain temperature
homeostasis and prevent the dehydration of premature infants.

Featured Fluorescent-Based
Monitors
Minimally Invasive O2 Monitor

FIGURE 7:  The wearable health patch developed by the Interuniversity Microelectronics
-Center. Adapted from [26]. BIOZ: bioimpedance; LDO: Low dropout regulator.

40	

FA L L 2 0 2 0	

IEEE SOLID-STATE CIRCUITS MAGAZINE	

The Lumee O2 platform has been
designed and developed to monitor
subcutaneous tissue O2 in the body,
based on the principles of optical



IEEE Solid-States Circuits Magazine - Fall 2020

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Fall 2020

Contents
IEEE Solid-States Circuits Magazine - Fall 2020 - Cover1
IEEE Solid-States Circuits Magazine - Fall 2020 - Cover2
IEEE Solid-States Circuits Magazine - Fall 2020 - Contents
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