A flash Josephson A/D converter constructed with one-junction SQUIDs

Author

Ko, H.

Author_Institution

Hewlett-Packard Labs., Palo Alto, CA, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

826

Lastpage

829

Abstract

A novel approach to the construction of a flash-type Josephson A/D (analog/digital) converter is presented. Simulations show that one-junction SQUID (superconducting quantum interference device) comparators can have a greater than fivefold advantage in bandwidth over the two- or three-junction SQUIDs in an A/D circuit. Assuming a Nb junction technology, the simulations show that a 6-bit A/D converter using one-junction SQUID comparators could have a sampling rate of ~20 GHz with ~5 bits of resolution for a 5-GHz input signal. Detailed analysis and simulations of an A/D converter constructed with one-junction SQUIDs are presented. Further improvement can be made by using a coding algorithm which requires 2N-1 comparators, instead of N, for an N-bit A/D converter

Keywords

SQUIDs; analogue-digital conversion; integrated circuit technology; superconducting junction devices; 20 GHz; 5 GHz; A/D circuit; ADC; Nb junction technology; bandwidth; circuit analysis; coding algorithm; digital simulations; flash Josephson A/D converter; improvement; one-junction SQUID comparators; one-junction SQUIDs; sampling rate; superconducting quantum interference device; Analog-digital conversion; Bandwidth; Circuit simulation; Interference; Josephson junctions; Niobium; SQUIDs; Sampling methods; Signal resolution; Superconducting devices;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92413

Filename

92413