### Abstract

Original language | English |
---|---|

Pages (from-to) | 064004 |

Journal | Superconductor Science and Technology |

Volume | 22 |

Issue number | 6 |

DOIs | |

Publication status | Published - Jun 2009 |

### Fingerprint

### Keywords

- superconducting quantum interference devices
- SQUIDs
- superconducting logic elements
- memory devices
- microelectronic circuits
- Josephson devices
- Oscillators
- pulse generators
- function generators

### Cite this

*Superconductor Science and Technology*,

*22*(6), 064004. https://doi.org/10.1088/0953-2048/22/6/064004

}

*Superconductor Science and Technology*, vol. 22, no. 6, pp. 064004. https://doi.org/10.1088/0953-2048/22/6/064004

**The dynamics of high-frequency DC RSQUID oscillators.** / Pegrum, C.M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - The dynamics of high-frequency DC RSQUID oscillators

AU - Pegrum, C.M.

PY - 2009/6

Y1 - 2009/6

N2 - Josephson circuit simulation software has been used to study the properties of a range of two-junction DC RSQUIDs configured as current-controlled heterodyne oscillators. We find that, if the loop inductance is small, their current-voltage curves are modified substantially due to self-induced Shapiro steps. When the heterodyne frequency is comparable with the Josephson frequency of the junctions the step amplitude becomes very large and additional features are seen, including sub-harmonic steps and step tails. We point out that conventional DC RSQUIDs generally have too large a loop inductance for some of these effects to be seen in the I-V curves, and we suggest that nanofabrication techniques could be used to make novel low-inductance RSQUIDs. We have also demonstrated that by applying a sinusoidally varying RF flux to a DC RSQUID it is possible to phase-modulate the heterodyne oscillation, which could have useful practical applications.

AB - Josephson circuit simulation software has been used to study the properties of a range of two-junction DC RSQUIDs configured as current-controlled heterodyne oscillators. We find that, if the loop inductance is small, their current-voltage curves are modified substantially due to self-induced Shapiro steps. When the heterodyne frequency is comparable with the Josephson frequency of the junctions the step amplitude becomes very large and additional features are seen, including sub-harmonic steps and step tails. We point out that conventional DC RSQUIDs generally have too large a loop inductance for some of these effects to be seen in the I-V curves, and we suggest that nanofabrication techniques could be used to make novel low-inductance RSQUIDs. We have also demonstrated that by applying a sinusoidally varying RF flux to a DC RSQUID it is possible to phase-modulate the heterodyne oscillation, which could have useful practical applications.

KW - superconducting quantum interference devices

KW - SQUIDs

KW - superconducting logic elements

KW - memory devices

KW - microelectronic circuits

KW - Josephson devices

KW - Oscillators

KW - pulse generators

KW - function generators

UR - http://dx.doi.org/10.1088/0953-2048/22/6/064004

U2 - 10.1088/0953-2048/22/6/064004

DO - 10.1088/0953-2048/22/6/064004

M3 - Article

VL - 22

SP - 064004

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 6

ER -