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A Discrete Component Low-Noise Preamplifier Readout for a Linear (1x16) SiC Photodiode ArrayA compact, low-noise and inexpensive preamplifier circuit has been designed and fabricated to optimally readout a common cathode (1x16) channel 4H-SiC Schottky photodiode array for use in ultraviolet experiments. The readout uses an operational amplifier with 10 pF capacitor in the feedback loop in parallel with a low leakage switch for each of the channels. This circuit configuration allows for reiterative sample, integrate and reset. A sampling technique is given to remove Johnson noise, enabling a femtoampere level readout noise performance. Commercial-off-the-shelf acquisition electronics are used to digitize the preamplifier analogue signals. The data logging acquisition electronics has a different integration circuit, which allows the bandwidth and gain to be independently adjusted. Using this readout, photoresponse measurements across the array between spectral wavelengths 200 nm and 370 nm are made to establish the array pixels external quantum efficiency, current responsivity and noise equivalent power.
Document ID
Document Type
Reprint (Version printed in journal)
Kahle, Duncan
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Aslam, Shahid
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herrero, Frederico A.
Waczynski, Augustyn
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
March 15, 2018
Publication Date
June 15, 2016
Publication Information
Publication: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume: 830
ISSN: 0168-9002
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
Distribution Limits
low-noise preamplifier

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