Design and fabrication of a HTC quasi-one junction SQUID based comparator for a 4-bit superconductive flash A/D converter

Author

Reuvekamp, E.M.C.M. ; Booi, P.A.A. ; Verhoeven, M.A.J. ; Gerritsma, G.J. ; Rogalla, H.

Author_Institution

Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2621

Lastpage

2624

Abstract

The design of a quasi-one-junction superconducting quantum interference device (SQUID)-based comparator for an all HTC superconductive 4-b flash analog-to-digital (A/D) converter is proposed and discussed. Ramp-type junctions of YBCO/PBCO/YBCO are used. The inductance can be realized by a stripline between the junctions. Simulations by the PSCAN package show correct behavior of the quasi-one-junction SQUID (QOS) up to frequencies of approximately 1 GHz. The output voltage pulses are periodic with the input current, as expected. In the dynamic simulations, output voltage pulses are observed at an applied flux of around (2m-1) Phi /sub 0//2. Tile junctions in the QOS are structured on two ramp-edges. The operating frequencies will be below 1 MHz in this first design. A first realization uses the YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) superconductor and PrBa/sub 2/Cu/sub 3/O/sub 7-x /(PBCO) as junction barrier and electrode interlayer material. On a 10-mm*10-mm SrTiO/sub 3/

Keywords

SQUIDs; analogue-digital conversion; comparators (circuits); high-temperature superconductors; superconducting integrated circuits; 1 GHz; 1 MHz; ADC; PSCAN package; SQUID based comparator; SrTiO/sub 3/ substrate; YBa/sub 2/Cu/sub 3/O/sub 7-x/-PrBa/sub 2/Cu/sub 3/O/sub 7-x/; dynamic simulations; electrode interlayer material; four bit resolution; junction barrier; quasi-one-junction; ramp-edge junctions; stripline; superconducting quantum interference device; superconductive flash A/D converter; Fabrication; Frequency; Interference; Josephson junctions; SQUIDs; Superconducting devices; Superconducting materials; Superconductivity; Voltage; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233519

Filename

233519