ISSTT Proceedings

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Time Resolved Measurements Of Flux-Flow Oscillator Line Width

Authors:
U. Müller, K. Jacobs
Abstract:
Superconducting Flux-Flow Oscillators (FFO) as local oscillators for radio astronomy are perfectly suited to be combined with SIS-mixing-devices in standard Nb/A1-AlOxfNb technology, having the potential to result in highly sophisticated integrated receivers up to the terahertz region. Oscillator linewidth and -stability are of exceptional importance for radio astronomical applications. A spectroscopic measurement setup for the 350GHz-band has been built up to investi gate the radiation properties of superconducting oscillators. We report on unique time resolved measurements of Flux-Flow Oscillator radiation characteristics using a modified KOSMA Acousto-Optical Spectrometer (AOS). Measurements with an inte gration time of 1µs result in a FFO linewidth of less than 1MHz at 350GHz. A simultaneously recorded spectrum analyzer trace with a sweep time of 40ms shows a FFO-linewidth of more than 20MHz. It is concluded that the time averaged linewidth of the Flux-Flow Oscillator - as can be seen on the spectrum analyzer - is due to frequency modulation of the intrinsic FFO-signal by low frequency pickup. A series of time resolved FFO-spectra gives a detailed impression of the evolution of the intrinsic FFO lineshape with time.
Categories:
Sources
Year:
1999
Session:
1
Full-text:
Download a PDF of this paper.
Page Number(s):
13-28