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Development of a Superconducting Analog-to-Digital Converter as a Readout for High-Resolution X-Ray Detectors Based on a Superconducting Tunnel Junction
Takayuki OKU Tokihiro IKEDA Chiko OTANI Kazuhiko KAWAI Hiromi SATO Hirohiko M. SHIMIZU Hiromasa MIYASAKA Yoshiyuki TAKIZAWA Hiroshi WATANABE Wataru OOTANI Hiroshi AKOH Hiroshi NAKAGAWA Masahiro AOYAGI Tohru TAINO
IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
superconducting analog-to-digital converter, X-ray detector, readout, SQUID, SFQ,
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We are developing a superconducting analog-to-digital converter (ADC) as a readout for high-resolution X-ray detectors based on a superconducting tunnel junction (STJ). The ADC has a sensitive front end which consists of a DC superconducting quantum interference device (SQUID). A signal current is digitized by this front end without using any preamplifiers. A single-flux-quantum (SFQ) pulse train whose frequency is proportional to the input current is launched by the front end, and integrated by a digital counter. The counter has a 10-bit resolution, and the integrated value is scanned and transferred to room-temperature processing modules with a frequency of 40 MHz. In this paper, the design of the ADC is described, and the preliminary results of the ADC performance test are shown. The performance of the STJ accompanied by the ADC is discussed in terms of the X-ray energy resolution.