Noise temperature and linewidth of high-temperature-superconducting heterodyne gigahertz oscillators

Du, J. and MacFarlane, J.C. and Hao, L. (2008) Noise temperature and linewidth of high-temperature-superconducting heterodyne gigahertz oscillators. Applied Physics Letters, 93 (3). ISSN 0003-6951 (http://dx.doi.org/10.1063/1.2959187)

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Abstract

A method for the generation of stable, widely tunable heterodyne oscillations by means of a high-temperature-superconducting resistive superconducting quantum interference device is described. The details of the fabrication techniques, electrical characteristics, operating temperatures and frequency range of 100 MHz-2 GHz, are reported. The noise temperatures of several devices, made and tested in different laboratories, are estimated and the linewidths of the heterodyne oscillations are compared with theoretical values.