readout asic development veritas ii
DESCRIPTION
Readout ASIC Development VERITAS II. Garching , 28 January 2014. Matteo Porro. 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 - PowerPoint PPT PresentationTRANSCRIPT
Wide Field Imager
Readout ASIC DevelopmentVERITAS II
Garching, 28 January 2014
Matteo Porro
Wide Field Imager
Focal Plane ASICs
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256 x 256
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
Readout ASIC
Switcher ASIC
Example of DEPFET prototype focal plane arrangement
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ASIC 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
1In collaboration with Politecnico di Milano, L. Bombelli and C. Fiorini
XMM-Newton and FEL experiments pnCCD with CAMEX BepiColombo DEPFET array with ASTEROID
*Synchrotron and FEL applications** Spectroscopy, X-ray astronomy, fast optical astronomy.
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DEPFET Readout ASICsMAIN 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
55Fe
T=-60 °C
Mn-Kα
0.9µs integration
clear settling
Source Follower readout
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
Asteroid
Asteroid
Wide Field Imager
VERITAS II ASIC
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Analog section(64 ch.)
4.6 mm
6.9 mm
S&H and MUX
SPI control& SRAM
AMS CMOS 0.35 m 3.3 V
Two readout modes:Source Follower Readout / Drain Readout
Targeted readout time per row with drain readout ~ 2.5 s
Fully differential architecture
64 readout channels
MUX 64:1 – design speed 32 MHz
Total power ~400-500 mW
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
Wide Field Imager
Results with SF are comparable with those obtained with ASTEROID
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
Bug fixing Optimization of parameters for ATHENA
requirements Possible additional features
Mn-Kα
55Fe
T=-60 °C
Preliminary results and outlook
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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. 401-408, 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