Switcher ASIC
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Transcript Switcher ASIC
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Readout ASIC Development
VERITAS II
Garching, 28 January 2014
Matteo Porro
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Focal Plane ASICs
Switcher ASICs
Steering of DEPFET Arrays (Row-select; Pixel
reset)
Provided so far by Heidelberg University
Heidelberg would be a natural provider for the
future
Readout ASIC
So far partially or completely developed at
MPE/HLL
MPE has the expertise in low-noise readout
The existing ASTEROID ASIC will be used for
MIXS of BepiColombo
VERITAS ASIC is being developed for ATHENA
Switcher ASIC
256 x 256
Readout ASIC
Example of DEPFET prototype focal plane
arrangement
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XMM-Newton and FEL experiments pnCCD with CAMEX
ASIC
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BepiColombo DEPFET array with ASTEROID
Filter
Filter architecture
pnCCD
DEPFET
SF
DEPFET
CR
Dynamic
range
CAMEX
MCDS
Unipolar, single-ended,
two stages
low*, high**
VELA1
Trapezoidal
Unipolar, single-ended,
two stages
low
ASTEROID1
Trapezoidal
Unipolar, single-ended,
two stages
low
VERITAS 1.0
Trapezoidal
Unipolar, single-ended,
two stages
low, high
VERITAS 2.0
Trapezoidal
bipolar, fully
differential, single stage
low, high
*Synchrotron and FEL applications
** Spectroscopy, X-ray astronomy, fast optical astronomy.
1In
collaboration with Politecnico di Milano,
L. Bombelli and C. Fiorini
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DEPFET Readout ASICs
MAIN CHARACTERISTICS AND FEATURES
Row-wise readout (parallel readout of all the pixels in one
sensor row)
Analog Multiplexing
Biasing of DEPFET arrays
Two possible input stages for:
Source Follower readout
AC coupling -> easy to operate
Long settling time
Drain Readout
bias current cancellation required
Very short settling times
Optimum analog shaping (trapezoidal Weighting function)
Window mode
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ASTEROID for BepiColombo
Asteroid
Mn-Kα
55Fe
T=-60 °C
Asteroid
Source Follower readout
0.9µs integration
clear settling
Total readout time: 4.8µs (1+0.9x2+2)
Effective signal processing time 1.8 s
energy resolution (FWHM @ 5.9 keV)
124.8 eV (singles)
128 eV (all events)
peak/background ratio
3.000:1
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VERITAS II ASIC
Analog section
(64 ch.)
S&H and
MUX
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AMS CMOS 0.35 m 3.3 V
SPI control
& SRAM
Two readout modes:
Source Follower Readout / Drain Readout
Targeted readout time per row with drain
readout ~ 2.5 s
4.6 mm
Fully differential architecture
64 readout channels
MUX 64:1 – design speed 32 MHz
Total power ~400-500 mW
6.9 mm
Can be used also with pnCCDs
(The use of the ASIC by different groups is
beneficial for fast development)
First version is available and is under test
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Preliminary results and outlook
Results with SF are comparable with those
obtained with ASTEROID
55Fe
T=-60 °C
The non-optimal resolution is due to the used
DEPFET
Investigation of the drain readout is ongoing
An optimized redesign is foreseen in one year
Mn-Kα
Bug fixing
Optimization of parameters for ATHENA
requirements
Possible additional features
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References
M. Porro et al. "VERITAS: A 128-channel ASIC for the readout of pnCCDs and DEPFET arrays for X-Ray imaging,
spectroscopy and xfel applications", IEEE Transactions on Nuclear Science, vol. 60, no. 1, pp. 446-455, 2013
P. Majewski et. al, "DEPFET macropixel detectors for MIXS: Integration and qualification of the flight detectors",
IEEE Transactions on Nuclear Science, vol. 59, no. 5 PART 3, pp. 2479-2486, 2012
A. Meuris et al. "Development and characterization of new 256 × 256 pixel DEPFET detectors for x-ray
astronomy", IEEE Transaction on Nuclear Science, vol. 58, no. 3 PART 3, pp. 1206-1211, 2011
M. Porro et al. "ASTEROID: A 64 channel ASIC for source follower readout of DEPFET arrays for X-ray
astronomy", Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers,
Detectors and Associated Equipment, vol. 617, no. 1-3, pp. 351-357, 2010
M. Porro et al. , "Spectroscopic performance of the DePMOS detector/amplifier device with respect to different
filtering techniques and operating conditions", IEEE Transactions on Nuclear Science, vol. 53, no. 1, pp. 401408, 2006
E. Gatti, et al., “Optimum filters for detector charge measurement in presence of 1/f noise,” Nucl. Instrum.
Methods A, vol. 287, pp. 513–520, 1990
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