Title :
High Tc harmonic mixer applied to Josephson junction array voltage standard at NIM
Author :
Xue, S.Q. ; Li, H.H. ; Shen, X.C. ; Wang, H.B. ; Xu, W.W. ; Wu, P.H.
Author_Institution :
Nat. Inst. of Metrol., Beijing, China
Abstract :
Summary form only given, as follows.High Tc superconducting (YBCO) Josephson junction harmonic mixer has been used to improve the spectrum purity of the microwave source in the JJAVS at NIM. Compare with the microwave source using source locking counter EIP 578B, the spectrum purity of the microwave source has been improved significantly from -25 dBc/Hz (offset /spl plusmn/500 kHz) to -58 dBc/Hz (offset /spl plusmn/10 kHz). Therefore, the uncertainty of the JJAVS was reduced.
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; measurement standards; microwave mixers; superconducting junction devices; superconducting microwave devices; voltage measurement; yttrium compounds; JJAVS; Josephson junction array; NIM; YBaCuO; harmonic mixer; high Tc superconductors; microwave source; spectrum purity; uncertainty; voltage standard; Counting circuits; Diodes; Frequency; Gunn devices; High temperature superconductors; Josephson junctions; Metrology; Uncertainty; Voltage; Yttrium barium copper oxide;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547042
