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ST419 - Multi-input Synchronous Analog-to-Digital Converter (Contest winner)

Multi-input Synchronous Analog-to-Digital Converter
Deepnarayan Gupta1, Senior Member, IEEE, Timur V. Filippov1, Andrei Talalaevskii1, Vladimir V. Dotsenko1, Alf E. Lehmann1, Saad Sarwana1, Son Dinh2, Osama Nayfeh2, and Anna Leese de Escobar2
1HYPRES, Inc., Elmsford, NY 10523, USA
2Space and Naval Warfare Systems Center Pacific (SSC-Pac), San Diego, CA, USA

Abstract — Integration of multiple synchronous identical superconductor analog-to-digital converters (ADCs) on a single chip or a multi-chip module is attractive for numerous applications, including Magnetic Resonance Imaging (MRI) systems. Several dual-ADC chips comprising two phase modulation-demodulation (PMD) ADCs with a common sampling clock, each connected to a digital decimation filter, have been designed. One variant with a single-junction quantizer with two-channel synchronizer and a decimation ratio of 256 has been installed in a modular cryocooled digital-RF receiver system (called ADR), operated with a common clock frequency of 20.48 GHz, and extensively tested with single and multiple input signals. Other variants have reduced decimation ratio for higher RF bands to digitize signals from higher-field MRI systems. Another variant of multi-input ADC integrated circuit chips have no on-chip filtering. We have designed and tested 2 (dual), 3 (tri), and 4 (quad) input versions of such a chip, where each ADC is followed by a deserializer circuit. A proof-of-concept multi-chip module (MCM) with 8 (octo) synchronous ADCs, consisting of four flipped dual-ADC chips on a carrier, has been designed to demonstrate scalability.

Keywords (Index Terms) — MRI, RSFQ, ADC, MCM, Digital Receiver.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2015.
Received September 16, 2014; Selected October 10, 2014.  Reference ST419; Category 4.
Preprint of ASC 2014 manuscript 4EPo1A-03 submitted to IEEE Trans. Appl. Supercond. for possible publication.