APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

23 Mar 1998

Volume 72, Issue 12, pp. 1409-1518

Return to All Sections
back to top
RSS Feeds

Measurement of the static error rate of a storage cell for single magnetic flux quanta, fabricated from high-Tc multilayer bicrystal Josephson junctions

Y. Chong, B. Ruck, R. Dittmann, C. Horstmann, A. Engelhardt, G. Wahl, B. Oelze, and E. Sodtke

Appl. Phys. Lett. 72, 1513 (1998); http://dx.doi.org/10.1063/1.121043 (3 pages) | Cited 6 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We measured the static error rate of a high-Tc superconductor dc superconducting quantum interference device (SQUID), which, in the form as a storage loop for single flux quanta, is a basic element of rapid single flux quantum circuits. Using high-Tc multilayer bicrystal technology, we fabricated a stacked dc SQUID pair, one SQUID serving as the storage loop, the other one as the readout device. The escape rate of a stored flux quantum was measured as a function of the bias current at a temperature of 28 K. The measured error rates were in good agreement with a model calculation based on thermally activated barrier crossing. © 1998 American Institute of Physics.
Show PACS
85.25.Cp Josephson devices
85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits
85.25.Dq Superconducting quantum interference devices (SQUIDs)

Spectrum of thermal fluctuation noise in diffusion and phonon cooled hot-electron mixers

P. J. Burke, R. J. Schoelkopf, D. E. Prober, A. Skalare, B. S. Karasik, M. C. Gaidis, W. R. McGrath, B. Bumble, and H. G. LeDuc

Appl. Phys. Lett. 72, 1516 (1998); http://dx.doi.org/10.1063/1.121044 (3 pages) | Cited 5 times

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A systematic study of the intermediate frequency noise bandwidth of Nb thin-film superconducting hot-electron bolometers is presented. We have measured the spectrum of the output noise as well as the conversion efficiency over a very broad intermediate frequency range (from 0.1 to 7.5 GHz) for devices varying in length from 0.08 μm to 3 μm. Local oscillator and rf signals from 8 to 40 GHz were used. For a device of a given length, the spectrum of the output noise and the conversion efficiency behave similarly for intermediate frequencies less than the gain bandwidth, in accordance with a simple thermal model for both the mixing and thermal fluctuation noise. For higher intermediate frequencies the conversion efficiency decreases; in contrast, the noise decreases but has a second contribution which dominates at higher frequency. The noise bandwidth is larger than the gain bandwidth, and the mixer noise is low, between 120 and 530 K (double side band). © 1998 American Institute of Physics.
Show PACS
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
74.78.-w Superconducting films and low-dimensional structures
85.25.Pb Superconducting infrared, submillimeter and millimeter wave detectors
84.30.Qi Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close