Title :
Circuit precautions for stable operation of Josephson junction array voltage standard
Author :
Yoshida, H. ; Sakamoto, Y. ; Endo, T.
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
Abstract :
Steps taken during the course of developing a Josephson junction array voltage standard to achieve a measurement uncertainty of better than 2*10/sup -8/ are described. They consist of improving the frequency stability of the Gunn oscillator by proper design of the phase-locked loop, choosing a digital voltmeter (DVM) with high resolution, low drift, and low noise emission for use as a null detector, and designing line filters to reduce noises introduced into the Josephson junction array.<>
Keywords :
Gunn oscillators; Josephson effect; digital voltmeters; frequency stability; measurement standards; phase-locked loops; superconducting junction devices; voltage measurement; Gunn oscillator; Josephson junction array voltage standard; digital voltmeter; frequency stability; line filters; noise reduction; null detector; phase-locked loop; Circuits; Frequency; Josephson junctions; Measurement standards; Measurement uncertainty; Noise reduction; Phase noise; Phased arrays; Standards development; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109944
