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Title: Input impedance of an amplifier based on a dc superconducting quantum interference device

Abstract

The measured input impedance of an amplifier involving a coil tightly coupled to a dc superconducting quantum interference device (SQUID) is found to depend on the current and flux biases of the SQUID. Variations in the input inductance arise from the reflected dynamic inductance of the SQUID, and are in reasonable agreement with the predictions of an analog simulator. Variations in the input resistance, on the other hand, arise from feedback between the output of the SQUID and the input circuit, and are in approximate agreement with the predictions of a simple model.

Authors:
;
Publication Date:
Research Org.:
Department of Physics, University of California, Berkeley, California 94720 and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
OSTI Identifier:
6452784
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Appl. Phys. Lett.; (United States)
Additional Journal Information:
Journal Volume: 45:7
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLIFIERS; IMPEDANCE; SQUID DEVICES; ELECTRONIC CIRCUITS; FEEDBACK; GAIN; RESONANCE; SUPERCONDUCTING COILS; TUNING; AMPLIFICATION; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUXMETERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; SUPERCONDUCTING DEVICES; 420201* - Engineering- Cryogenic Equipment & Devices

Citation Formats

Hilbert, C, and Clarke, J. Input impedance of an amplifier based on a dc superconducting quantum interference device. United States: N. p., 1984. Web. doi:10.1063/1.95370.
Hilbert, C, & Clarke, J. Input impedance of an amplifier based on a dc superconducting quantum interference device. United States. https://doi.org/10.1063/1.95370
Hilbert, C, and Clarke, J. 1984. "Input impedance of an amplifier based on a dc superconducting quantum interference device". United States. https://doi.org/10.1063/1.95370.
@article{osti_6452784,
title = {Input impedance of an amplifier based on a dc superconducting quantum interference device},
author = {Hilbert, C and Clarke, J},
abstractNote = {The measured input impedance of an amplifier involving a coil tightly coupled to a dc superconducting quantum interference device (SQUID) is found to depend on the current and flux biases of the SQUID. Variations in the input inductance arise from the reflected dynamic inductance of the SQUID, and are in reasonable agreement with the predictions of an analog simulator. Variations in the input resistance, on the other hand, arise from feedback between the output of the SQUID and the input circuit, and are in approximate agreement with the predictions of a simple model.},
doi = {10.1063/1.95370},
url = {https://www.osti.gov/biblio/6452784}, journal = {Appl. Phys. Lett.; (United States)},
number = ,
volume = 45:7,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 1984},
month = {Mon Oct 01 00:00:00 EDT 1984}
}