Speedster-EXD: a new event-driven hybrid CMOS x-ray detector

Griffith, C.; Falcone, A.; Prieskorn, Zachary; Burrows, D. N.

doi:10.1117/1.jatis.2.1.016001

Cited by 20 publications

(14 citation statements)

References 31 publications

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“…The CTIA was previously implemented on another prototype HCD, the Speedster-EXD, where it was shown to result in unmeasurable IPC (<1%). 25 The small-pixel HCDs also feature the ability to perform in-pixel correlated double sampling (CDS) by subtraction of the variable baseline voltage associated with a pixel reset. This subtraction is carried out on-chip, prior to further amplification.…”

Section: Small-pixel Hcdsmentioning

confidence: 99%

Hybrid CMOS detectors for the Lynx x-ray surveyor high definition x-ray imager

Hull

Falcone

Bray

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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X-ray hybrid CMOS detectors (HCDs) are a promising candidate for future x-ray missions requiring high throughput and fine angular resolution along with large field-of-view, such as the high-definition x-ray imager (HDXI) instrument on the Lynx x-ray surveyor mission concept. These devices offer fast readout capability, low power consumption, and radiation hardness while maintaining high detection efficiency from 0.2 to 10 keV. In addition, x-ray hybrid CMOS sensors may be fabricated with small pixel sizes to accommodate high-resolution optics and have shown great improvements in recent years in noise and spectral resolution performance. In particular, 12.5-μm pitch prototype devices that include in-pixel correlated double sampling capability and crosstalk eliminating capacitive transimpedance amplifiers, have been fabricated and tested. These detectors have achieved read noise as low as 5.4 e − , and we measure the best energy resolution to be 148 eV (2.5%) at 5.9 keV and 78 eV (14.9%) at 0.53 keV. We will describe the characterization of these prototype small-pixel x-ray HCDs, and we will discuss their applicability to the HDXI instrument on Lynx. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Small-pixel Hcdsmentioning

confidence: 99%

Hybrid CMOS detectors for the Lynx x-ray surveyor high definition x-ray imager

Hull

Falcone

Bray

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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“…The Speedster-EXD is an advanced design utilizing a Capacitive Transimpedence Amplifier (CTIA), in-pixel CDS, and event recognition circuitry to provide eventdriven sparse readout. The CTIA eliminates interpixel capacitive crosstalk completely (Griffith et al 2016). The in-pixel CDS reduces 1/f noise and cancels the CTIA reset KTC noise.…”

Section: Speedster-exdmentioning

confidence: 99%

BlackCAT CubeSat: a soft x-ray sky monitor, transient finder, and burst detector for high-energy and multimessenger astophysics

Chattopadhyay

Falcon

Burrows

et al. 2018

Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray

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Here we present the conceptual design of a wide field imager onboard a 6U class CubeSat platform for the study of GRB prompt and afterglow emission and detection of electromagnetic counterparts of gravitational waves in soft X-rays. The planned instrument configuration consists of an array of X-ray Hybrid CMOS detectors (HCD), chosen for their soft-X-ray response, flexible and rapid readout rate, and low power, which makes these detectors well suited for detecting bright transients on a CubeSat platform. The wide field imager is realized by a 2D coded mask. We will give an overview of the instrument design and the scientific requirements of the proposed mission.

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“…IPC was found to be negligible. More details on the experiment set-up and characterization can be found in [20]. A larger version of Speedster detectors is currently being developed.…”

Section: Speedster-exdmentioning

confidence: 99%

X-ray hybrid CMOS detectors: recent development and characterization progress

Chattopadhyay

Falcone²,

Burrows

et al. 2018

Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray

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X-ray Hybrid CMOS Detectors (HCDs) have advantages over X-ray CCDs due to their higher readout rate abilities, flexible readout, inherent radiation hardness, and low power, which make them more suitable for the next generation large-area X-ray telescope missions. The Penn State high energy astronomy laboratory has been working on the development and characterization of HCDs in collaboration with Teledyne Imaging Sensors (TIS). A custom-made H2RG detector with 36 µm pixel pitch and 18 µm ROIC shows an improved performance over standard H1RG detectors, primarily due to a reduced level of inter-pixel capacitance crosstalk (IPC). However, the energy resolution and the noise of the detector and readout system are still limited when utilizing a SIDECAR at non-cryogenic temperatures. We characterized an H2RG detector with a Cryo-SIDECAR readout and controller, and we find an improved energy resolution of ∼2.7 % at 5.9 keV and read noise of ∼6.5 e-. Detections of the ∼0.525 keV Oxygen Kα and ∼0.277 keV Carbon Kα lines with this detector display an improved sensitivity level at lower energies. This detector was successfully flown on NASA's first water recovery sounding rocket flight on April 4 th , 2018. We have also been developing several new HCDs with potential applications for future X-ray astronomy missions. We are characterizing the performance of small-pixel HCDs (12.5 µm pitch), which are important for the development of a next-generation high-resolution imager with HCDs. The latest results on these small pixel detectors has shown them to have the best read noise and energy resolution to-date for any X-ray HCD, with a measured 5.5 e-read noise for a detector with in-pixel correlated double sampling. Event recognition in HCDs is another exciting prospect. We characterized a 64 × 64 pixel prototype Speedster-EXD detector that uses comparators in each pixel to read out only those pixels having detectable signal, thereby providing an order of magnitude improvement in the effective readout rate. Currently, we are working on the development of a large area Speedster-EXD with a 550 × 550 pixel array. HCDs can also be utilized as a large FOV instrument to study the prompt and afterglow emissions of GRBs and detect black hole transients. In this context, we are characterizing a Lobster-HCD system for future CubeSat experiments. This paper briefly presents these new developments and experimental results.

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Speedster-EXD: a new event-driven hybrid CMOS x-ray detector

Cited by 20 publications

References 31 publications

Hybrid CMOS detectors for the Lynx x-ray surveyor high definition x-ray imager

Hybrid CMOS detectors for the Lynx x-ray surveyor high definition x-ray imager

BlackCAT CubeSat: a soft x-ray sky monitor, transient finder, and burst detector for high-energy and multimessenger astophysics

X-ray hybrid CMOS detectors: recent development and characterization progress

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