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. ; Cheng, Q.H. ; Wu, P.H.
Author_Institution :
Nat. Inst. of Metrol., Beijing, China
fDate :
4/1/1997 12:00:00 AM
Abstract :
A high-Tc superconducting (YBCO) Josephson-junction harmonic mixer has been used to improve the spectrum purity of the microwave source in the JJAVS at the National Institute of Metrology (NIM). Compared 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 ±50 kHz) to -58 dBc/Hz (offset ±10 kHz). Therefore, the random uncertainty of the JJAVS was reduced
Keywords :
calibration; high-temperature superconductors; measurement standards; millimetre wave mixers; superconducting junction devices; voltage measurement; EIP 578B; JJAVS; Josephson junction array voltage standard; NIM; National Institute of Metrology; high-Tc harmonic mixer; microwave source; random uncertainty; source-locking counter; spectrum purity; Counting circuits; Frequency; Josephson junctions; Metrology; Microwave antenna arrays; Schottky diodes; Superconducting microwave devices; Voltage; Voltage-controlled oscillators; Yttrium barium copper oxide;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
