The Speedster-EXD- A New Event-Driven Hybrid CMOS X-ray Detector
Abstract
The Speedster-EXD is a new 64×64 pixel, 40-μm pixel pitch, 100-μm depletion depth hybrid CMOS x-ray detector with the capability of reading out only those pixels containing event charge, thus enabling fast effective frame rates. A global charge threshold can be specified, and pixels containing charge above this threshold are flagged and read out. The Speedster detector has also been designed with other advanced in-pixel features to improve performance, including a low-noise, high-gain capacitive transimpedance amplifier that eliminates interpixel capacitance crosstalk (IPC), and in-pixel correlated double sampling subtraction to reduce reset noise. We measure the best energy resolution on the Speedster-EXD detector to be 206 eV (3.5%) at 5.89 keV and 172 eV (10.0%) at 1.49 keV. The average IPC to the four adjacent pixels is measured to be 0.25%±0.2% (i.e., consistent with zero). The pixel-to-pixel gain variation is measured to be 0.80%±0.03%, and a Monte Carlo simulation is applied to better characterize the contributions to the energy resolution.
- Publication:
-
Journal of Astronomical Telescopes, Instruments, and Systems
- Pub Date:
- January 2016
- DOI:
- 10.1117/1.JATIS.2.1.016001
- arXiv:
- arXiv:1602.07709
- Bibcode:
- 2016JATIS...2a6001G
- Keywords:
-
- Astrophysics - Instrumentation and Methods for Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- 24 pages, 14 figures. Accepted for publication in the Journal of Astronomical Telescopes, Instruments, and Systems