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Readout ASIC Development VERITAS II Garching, 28 January 2014 Matteo Porro
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Focal Plane ASICs 2 256 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 2
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ASICFilterFilter architecturepnCCDDEPFET SF DEPFET CR Dynamic range CAMEXMCDSUnipolar, single-ended, two stages low*, high** VELA 1 TrapezoidalUnipolar, single-ended, two stages low ASTEROID 1 TrapezoidalUnipolar, single-ended, two stages low VERITAS 1.0TrapezoidalUnipolar, single-ended, two stages low, high VERITAS 2.0Trapezoidalbipolar, fully differential, single stage low, high 1 In 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. 3
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DEPFET Readout ASICs 4 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 5 55 Fe 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
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VERITAS II ASIC 6 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
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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 55 Fe T=-60 °C Preliminary results and outlook 7
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References 8 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
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