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Review of Scientific Instruments

Role of superconducting electronics in advancing science and technology (invited) (abstract)

S. M. Faris

Published Aug 1, 1988• 0 citations
Publisher

Abstract

The promises of the ultrahigh-performance properties of superconductivity and Josephson junction technologies have been known for quite some time. This presentation describes the first superconducting electronics and measurement system and its important role as a major tool to advance microwave and millimeter wave technologies. This breakthrough tool is a sampling oscilloscope with 5-ps rise time, 50-μV sensitivity, and a time domain reflectometer with 8-ps rise time. In order to achieve these performance goals, several technological hurdles had to be overcome including perfecting a manufacturing process for building Josephson junction IC chips, developing an innovative cooling technique, developing interfaces and interconnections with bandwidths in excess of 70 GHz, and developing the room-temperature hardware and software necessary to make the instruments convenient, easy to use, easy to learn, in addition to making available functions and features users have come to expect from sophisticated digital test instrumentation. These technological developments are stepping stones leading to the realization of more sophisticated and complex electronic systems satisfying the needs of scientists, technologists, and engineers. The unprecedented speed and sensitivity make it possible to attack new frontiers.

DOI
10.1063/1.1140114

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The promises of the ultrahigh-performance properties of superconductivity and Josephson junction technologies have been known for quite some time. This presentation describes the first superconducting electronics and measurement system and its important role as a major tool to advance microwave and millimeter wave technologies. This breakthrough tool is a sampling oscilloscope with 5-ps rise time, 50-μV sensitivity, and a time domain reflectometer with 8-ps rise time. In order to achieve these performance goals, several technological hurdles had to be overcome including perfecting a manufacturing process for building Josephson junction IC chips, developing an innovative cooling technique, developing interfaces and interconnections with bandwidths in excess of 70 GHz, and developing the room-temperature hardware and software necessary to make the instruments convenient, easy to use, easy to learn, in addition to making available functions and features users have come to expect from sophisticated digital test instrumentation. These technological developments are stepping stones leading to the realization of more sophisticated and complex electronic systems satisfying the needs of scientists, technologists, and engineers. The unprecedented speed and sensitivity make it possible to attack new frontiers.
HYPRES, Inc. has introduced a Sampling Oscilloscope/Time Domain Reflectometer (TDR) based on Josephson junction technology to the commercial marketplace. The unit offers measurement performance commensurate with the inherent high speed of the Josephson elements, e.g., risetimes on the order of 8 ps. The Josephson circuitry is contained on a single 1.1 × 1.6 fused silica substrate and housed in an interchangeable measurement module. Only the portion of the chip which contains the superconducting circuitry is cooled with a coplanar transmission line providing the wide bandwidth interface between the room temperature and cryogenic environments less than 1cm apart.
HYPRES, Inc. has introduced to the commercial marketplace a Sampling Oscilloscope/Time Domain Reflectometer (TDR) based on Josephson junction technology. The unit offers measurement performance commensurate with the inherent high speed of the Josephson elements, e.g., bandwidths in excess of 70 GHz and rise times on the order of 5 ps. A Josephson {rigger recognizer and delay circuit allows triggering of the sampling oscilloscope from the signal itself, with full view of the trigger point. Input modules offering different sensitivities or TDR capability are quickly interchangeable, and operating temperature is achieved in less than one minute. The technical details of the cooling technique and the chip circuitry will be described in this paper .
Superconductive electronics offers a unique combination of high bandwidth and low power for mission critical hardware such as digital processors at 20 to 100 GHz, microwatt per bit analog to digital converters, large digital switches at multi-Gb/s data rates, and low noise parametric amplifiers. This cryogenic technology, typically operating at a few degrees or a few tens of degrees Kelvin, depends upon the unique physics of superconducting materials such as Nb, NbN, and YBaCuO, and the fundamental circuit element, the Josephson junction (JJ) to create unique architectures of unprecedented design efficiency and performance. These circuits are based on the single flux quantum (SFQ) logic family, a technology that has no parallel in semiconductor electronics. Digital data is transmitted by voltage pulses with amplitude less than 1 mV, but at extremely high speeds. Individual gates have been operated as high as 370 GHz. In this paper, we present a brief overview of superconductive digital technology, describe some recent circuits, and discuss how the challenges to superconductive technology are being met, including the use of multi-chip module (MCM) technology, and the potential use of III-V HBT and HEMT circuits to provide interface drivers and amplifiers, possibly operated cryogenically.
The pioneers of superconducting electronics are accumulating an impressive record of achievement. For example, they have now gained the high-performance lead in the important field of digital electronics. Logic delays of 13 picoseconds and switching times of 9 picoseconds have been experimentally demonstrated. The same basic devices, Josephson junctions, also make the most sensitive microwave detectors, the most sensitive magnetometers (or current sensors) and the most stable voltage sources. Although each of these developments is an important independent accomplishment, the combination of these developments in a single technology merits special attention.
CSIRO is the Australian national science agency and has had a long-history in research and development of superconducting electronic devices and systems for various practical applications. In this paper, I will give a brief introduction about the Josephson junction technology and describe CSIRO’s research progress in developing various novel high-Tcsuperconducting (HTS) Josephson junction devices and their applied systems. Recently, CSIRO has led the frontier research and development of high-frequency HTS Josephson detectors and heterodyne mixers ranging from microwave, millimeter, to terahertz (THz) frequency bands. These high-frequency superconducting quantum sensors/devices have demonstrated superior performance and applied in sensing and communication systems.
A superconducting sampling measurement system is a highly useful tool for analyzing ultrahigh speed electrical signals in cryogenic environments, due to a time resolution at ps levels with low current levels of /spl mu/A. The digitizing sampling system is composed of a Josephson sampling circuit, digital delay line, feedback signal detection circuit and a computer. The Josephson sampling circuit is designed for ETL's Nb-AlO/sub x/-Nb junction technology. A TDR measurement method using a CPW flip-chip bonding technique is proposed. The theoretical spatial resolution is estimated to reach around a hundred /spl mu/m.