Title :
Stability of Superconducting Hot Electron Bolometer Receivers
Author :
Chen, J. ; Jiang, Y. ; Liang, M. ; Kang, L. ; Jin, B.B. ; Xu, W.W. ; Wu, P.H.
Author_Institution :
Dept. of Electron. Eng., Nanjing Univ., Nanjing, China
fDate :
6/1/2011 12:00:00 AM
Abstract :
Superconducting receivers based on large hot electron bolometer (HEB) bridges were constructed and they show low noise temperatures. Their stability has been characterized by the Allan variance measurements with either far-infrared laser or Gunn oscillator plus multiplier chain as the local oscillator. An Allan time of about 1 s has been obtained. Also demonstrated is the effectiveness of a stabilization scheme in which a radiation at a frequency much lower than the gap frequency of niobium nitride is used for improvement.
Keywords :
Gunn oscillators; bolometers; hot carriers; niobium compounds; stability; submillimetre wave receivers; superconducting devices; terahertz wave devices; Allan variance measurements; Gunn oscillator plus multiplier; NbN; far-infrared laser; hot electron bolometer bridges; local oscillator; low noise temperatures; stabilization scheme; superconducting hot electron bolometer receiver stability; terahertz receiver; Feedback loop; Laser stability; Microwave theory and techniques; Mixers; Noise; Receivers; Thermal stability; Allan variance; hot electron bolometer; stability; terahertz receiver;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2095815
