Low-Distortion Waveform Synthesis with Josephson Junction Arrays

Samuel P. BENZ  Fred L. WALLS  Paul D. DRESSELHAUS  Charles J. BURROUGHS  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.608-611
Publication Date: 2002/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
Keyword: 
Josephson juncion,  voltage standard,  digital synthesis,  harmonic distortion,  phase noise,  

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Summary: 
We present measurements of kilohertz and megahertz sine waves synthesized using a Josephson arbitrary waveform synthesizer. A 4.8 kHz sine wave synthesized using an ac-coupled bias technique is shown to have a stable 121 mV peak voltage and harmonic distortion 101 dB below the fundamental (-101 dBc (carrier)). We also present results of our first phase-noise measurement. A 5.0 MHz sine wave was found to have distortion 33 dB lower than the same signal synthesized using a semiconductor digital code generator. The white-noise floor of the Josephson synthesized signal is -132 dBc/Hz and is limited by the noise floor of the preamplifier.