Instrumentation & Measurement Magazine 24-9 - 9

provided 40 ps time resolution
(article in publication).
The same test setup was
used to evaluate the performance
as a function of the
amplifier power consumption.
Fig. 4b also shows that
the SiGe HBT provides a
time resolution of 140 ps at
the much lower amplifier
power density of 130 mW/
cm2
[15].
MONOLITH Project:
A New Sensor
for Picosecondlevel
Timing
Measurements
The H2020 ERC Advanced
project MONOLITH proposes
the development
of the patented PicoAD
sensor, a multi-junction
monolithic silicon pixel
detector able to reach few
picoseconds time resolution
for the detection of
ionizing radiation, an order
of magnitude better than
the present best values.
The PicoAD will be implemented
in a MAPS with
pixels down to 50×50 μm2
area, thus allowing for excellent
spatial and time
resolutions at the same
time.
The novelty of the PiFig.
4. (a) Prototype chip with hexagonal pixels with sides of 65 and 130 μm, from [6]; (b) Time resolution of the 65 μm
side pixels vs. HV. The data are reported for different HBT collector currents.
The prototype chip was tested with a 90
Sr source. After a
time-walk correction performed with the Time-Over-Threshold
information, a time resolution down to 50 ps was
measured [6] (Fig. 4b), which is the state-of-the-art timing
performance for a PIN silicon pixel sensor for ionizing radiation.
Similar measurements on a successive prototype which
allowed to correct for time-walk using the signal amplitude
December 2021
coAD sensor lies in the
presence of a second PN
junction that forms a continuous
gain layer that
operates in avalanche
mode. The gain layer is not
implanted as commonly
done right underneath
the pixel, but instead it is
placed a few μm from the
backside of the silicon bulk
(Fig. 5a), thus decoupling the electron-multiplication stage
from the signal induction in the sensor. The first big advantage
of this sensor structure is that only the primary electrons produced
in such few μm layer are multiplied by the gain layer so
that the Landau noise, that presently limits the time resolution
of the fastest existing silicon detectors to few tens of picoseconds,
is strongly reduced. The second big advantage is that
IEEE Instrumentation & Measurement Magazine
9

Instrumentation & Measurement Magazine 24-9

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