Josephson look-back analog to digital converter

Author

Anderson, C.J.

Author_Institution

IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2769

Lastpage

2773

Abstract

A Josephson analog-to-digital (A/D) converter which uses a look-back algorithm to increase accuracy was designed and experimentally verified. The look-back A/D algorithm and its implementation in a Josephson 6-b A/D converter are described. High-speed measurements verified that the 3-b look-back A/D converter functions at 534 Msamples/s. The look-back algorithm increases the margins of an A/D converter that uses the lobes of a superconducting quantum interference device´s (SQUID´s) threshold curve. The self-gating AND circuits (SGAs) give the A/D converter a short aperture time. The SGAs sample the analog signal in parallel and then the look-back logic decodes the two´s complement outputs in series with only one stage of logic per bit. With a stable process the look-back A/D converter can be generated on chip.<>

Keywords

Josephson effect; SQUIDs; analogue-digital conversion; superconducting integrated circuits; ADC; SQUID; look-back A/D converter; look-back algorithm; self-gating AND circuits; six bit type; superconducting quantum interference device; two´s complement outputs; Algorithm design and analysis; Analog-digital conversion; Apertures; Decoding; Interference; Josephson junctions; Logic devices; SQUIDs; Superconducting devices; Superconducting logic circuits;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233507

Filename

233507