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Readout ASIC Development VERITAS II

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

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Readout ASIC Development VERITAS II

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  1. Readout ASIC DevelopmentVERITAS II Garching, 28 January 2014 Matteo Porro

  2. 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 2

  3. XMM-Newton and FEL experiments pnCCD with CAMEX BepiColombo DEPFET array with ASTEROID *Synchrotron and FEL applications ** Spectroscopy, X-ray astronomy, fast optical astronomy. 1In collaboration with Politecnicodi Milano, L. Bombelli and C. Fiorini

  4. 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

  5. ASTEROID for BepiColombo Asteroid Mn-Kα 55Fe T=-60 °C Asteroid • 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 0.9µs integration clear settling

  6. VERITAS II ASIC • AMS CMOS 0.35 mm 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 S&H and MUX SPI control & SRAM Analog section (64 ch.) 4.6 mm 6.9 mm

  7. Preliminary results and outlook • 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 55Fe T=-60 °C Mn-Kα

  8. 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

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