Publication detail

Implementation of a Superconducting High Frequency Divider Circuit with NbN/TaXN/NbN Josephson Junctions

MICHAL, V.

Original Title

Implementation of a Superconducting High Frequency Divider Circuit with NbN/TaXN/NbN Josephson Junctions

Type

conference paper

Language

English

Original Abstract

Rapid Single Flux Quantum logics (RSFQ) based on superconducting NbN-TaXN-NbN Josephson junctions (SNS type), present strong advantages over Semiconductor based logics due to faster gates with much lower power dissipation. Thanks to high resistivity of TaXN sputtered barriers, Josephson junctions can operate at 9K in a relaxed cryogenic environment. In order to prepare a NbN ADC technology for space telecoms we have sputtered ~7nm thick TaXN barrier layer at 300 stupňů C showing the required insulator behaviour, low roughness with a large NbN electrodes critical temperature (Tc=15.5K). At 10K, Jc~10kA/cm2 and RnIc up to ~0.3 mV; Josephson behaviour is observed up to 14K. We are preparing a 10 to 15 photo-mask levels circuit technology to be ported in the Leti 200mm Si-MOS Fab. The advantages both in compactness, operating temperature and frequency (~200GHz clock) of self-shunted NbN junctions over Nb externally shunted ones is illustrated for a 1/64 frequency divider.

Keywords

Superconducting High Frequency Divider, Josephson Junctions, operating temperature

Authors

MICHAL, V.

RIV year

2007

Released

1. 7. 2007

Publisher

UTEE, FEKT VUT v Brně

Location

Paris

ISBN

978-80-214-3476-9

Book

TIEF 2007

Pages from

1

Pages to

4

Pages count

4

BibTex

@inproceedings{BUT23539,
  author="Vratislav {Michal}",
  title="Implementation of a Superconducting High Frequency Divider Circuit with NbN/TaXN/NbN Josephson Junctions",
  booktitle="TIEF 2007",
  year="2007",
  pages="1--4",
  publisher="UTEE, FEKT VUT v Brně",
  address="Paris",
  isbn="978-80-214-3476-9"
}