Switcher ASIC

Report
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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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