Mr. Sakya Sinha Profile

Sakya Sinha

at Inter-Univ Ctr for Astronomy and Astrophysics

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Publications (5)

SPIE Journal Paper | 11 July 2018

Noise characterization of IUCAA digital sampling array controller

Sabyasachi Chattopadhyay, A. N. Ramaprakash, Bhushan Joshi, Pravinkumar Chordia, Mahesh Burse, Kalpesh Chillal, Sakya Sinha, Sujit Punnadi, Ketan Rikame, Sungwook Hong, Dhruv Paranjpye, Haeun Chung, Changbom Park, Amitesh Omar

JATIS, Vol. 4, Issue 03, 036002, (July 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.3.036002

KEYWORDS: Interference (communication), Charge-coupled devices, Electrons, Analog electronics, Clocks, Amplifiers, Power supplies, Sensors, Field programmable gate arrays, Statistical modeling

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The IUCAA digital sampling array controller (IDSAC) is a flexible and generic yet powerful CCD controller that can handle a wide range of scientific detectors. Based on an easily scalable modular backplane architecture consisting of single board controllers (SBC), IDSAC can control large detector arrays and mosaics. Each of the SBCs offers the full functionality required to control a CCD independently. The SBCs can be cold swapped without the need to reconfigure them. IDSAC is also available in a backplane-less architecture. Each SBC can handle data from up to four video channels with or without dummy outputs at speeds up to 500-kilo pixels per second (kPPS) per channel with a resolution of 16 bits. Communication with a Linux-based host computer is through a USB3.0 interface, with the option of using copper or optical fibers. A field programmable gate array (FPGA) is used as the master controller in each SBC, which allows great flexibility in optimizing performance by adjusting gain, timing signals, bias levels, etc., using user-editable configuration files without altering the circuit topology. Elimination of thermal kTC noise is achieved via digital correlated double sampling (DCDS). The number of digital samples per pixel (for both reset and signal levels) is user configurable. We present the results of noise performance characterization of IDSAC through simulation, theoretical modeling, and actual measurements. The contribution of different types of noise sources is modeled using a tool to predict noise of a generic DCDS signal chain analytically. The analytical model predicts the net input referenced noise of the signal chain to be 5 electrons for 200-k pixels/s per channel readout rate with three samples per pixel. Using a cryogenic test setup in the lab, the noise is measured to be 5.4 e (24.3 μV), for the same readout configuration. With a better-optimized configuration of 500-kPPS readout rate, the measured noise is down to 3.8 electrons RMS (17 μV), with three samples per interval.

Proceedings Article | 6 July 2018 Paper

Design and results for the SAAO wide-field nasmyth camera

Pieter Swanevelder, Dave Carter, James O'Connor, Hannah Worters, Willie Koorts, Briehan Lombaard, Egan Loubser, Keegan Titus, Carel van Gend, Michael Rust, Craig Sass, Hitesh Gajjar, Amanda Sickafoose, A. N. Ramaprakash, Pravin Chordia, Mahesh Burse, Sujit Punnadi, Bhushan Joshi, Sakya Sinha

Proceedings Volume 10702, 107022K (2018) https://doi.org/10.1117/12.2312540

KEYWORDS: Camera shutters, Charge-coupled devices, Cameras, Telescopes, Astronomy

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Proceedings Article | 27 July 2016 Paper

Evaluating noise performance of the IUCAA sidecar drive electronics controller (ISDEC) based system for TMT on-instrument wavefront sensing (OIWFS) application

Mahesh Burse, Sabyasachi Chattopadhyay, A. Ramaprakash, Sakya Sinha, Swapnil Prabhudesai, Sujit Punnadi, Pravin Chordia, Abhay Kohok

Proceedings Volume 9915, 991520 (2016) https://doi.org/10.1117/12.2232265

KEYWORDS: Sensors, Wavefront sensors, Control systems, Analog electronics, Multiplexers, Stars, Field programmable gate arrays, Power supplies, Electrons, Interfaces

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Proceedings Article | 27 July 2016 Paper

ISDEC-2 and ISDEC-3 controllers for HAWAII detectors

Mahesh Burse, A. Ramaprakash, Pravinkumar Chordia, Sujit Punnadi, Kalpesh Chillal, Vilas Mestri, Rupali Bharti, Sakya Sinha, Abhay Kohok

Proceedings Volume 9915, 991526 (2016) https://doi.org/10.1117/12.2232510

KEYWORDS: Sensors, Electronics, Astronomy, Observatories, Telescopes, Field programmable gate arrays, Interfaces, Clocks, Control systems, Analog electronics

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Proceedings Article | 20 July 2010 Paper

Controller and data acquisition system for SIDECAR ASIC driven HAWAII detectors

Anamparambu Ramaprakash, Mahesh Burse, Pravin Chordia, Kalpesh Chillal, Abhay Kohok, Vilas Mestry, Sujit Punnadi, Sakya Sinha

Proceedings Volume 7742, 77422I (2010) https://doi.org/10.1117/12.858455

KEYWORDS: Sensors, Data acquisition, Human-machine interfaces, Staring arrays, Field programmable gate arrays, Cryogenics, Astronomy, Electrons, Interfaces, Readout integrated circuits

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