Multigigahertz performance of a superconducting analog-to-digital converter

Howard C. Luong; Theodore Van Duzer

doi:10.1117/12.181009

2 July 1994 Multigigahertz performance of a superconducting analog-to-digital converter

Howard C. Luong, Theodore Van Duzer

Proceedings Volume 2160, Superconductive Devices and Circuits; (1994) https://doi.org/10.1117/12.181009
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

This paper presents the progress we have made on our design, fabrication, and testing of a fully parallel superconducting analog-to-digital converter (ADC) with multi-GHz clock frequencies and input bandwidth. To our best knowledge, this converter is the first flash-type analog-to-digital converter ever reported in Josephson technology that fully integrates a quantizer and a thermometer-to-binary encoder to achieve binary outputs. In this design, the quantizer consists of 2(superscript N-1 comparators, each of which is realized using a hysteretic one- junction sampling SQUID driving a two-junction readout SQUID. A new logic family has been designed based on the same comparator building block and has been used to implement the thermometer-to- binary encoder. Taking advantage of the fact that the encoder's input is thermometer-coded, we have designed three-input and four-input quasi-XOR gates with only three NAND gates and therefore reduced significantly the total gate count. Functionalities of all the sub-circuits have been verified experimentally at clock frequencies up to 3 GHz, which is limited by our currently available testing equipment.

Citation Download Citation

Howard C. Luong and Theodore Van Duzer "Multigigahertz performance of a superconducting analog-to-digital converter", Proc. SPIE 2160, Superconductive Devices and Circuits, (2 July 1994); https://doi.org/10.1117/12.181009

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KEYWORDS

Clocks

Computer programming

Binary data

Logic devices

Superconductors

Logic

Control systems

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