Title :
An AC Josephson source for Johnson noise thermometry
Author :
Benz, S.P. ; Martinis, J.M. ; Dresselhaus, P.D. ; Nam, S.W.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
We have adapted the Josephson arbitrary waveform synthesizer to create a quantized voltage noise source suitable for calibrating the cross-correlation electronics of a Johnson noise thermometer system. The requirements of long term stability and low voltage amplitude allow dramatic simplification of the bias electronics compared to previous circuits. We describe the bias technique and the superconducting integrated circuit used to generate the pseudo-noise waveforms.
Keywords :
Josephson effect; measurement standards; noise generators; superconducting arrays; superconducting integrated circuits; temperature measurement; thermal noise; waveform generators; AC Josephson source; Johnson noise thermometer system calibration; Johnson noise thermometry; Josephson waveform synthesizer; bias electronics; bias technique; cross-correlation electronics; electronic temperature standard; long term stability; low voltage amplitude; pseudo-noise waveforms; quantized voltage noise source; quantizer circuit design; superconducting IC; superconducting Josephson junctions; Bandwidth; Electrical resistance measurement; Integrated circuit noise; Josephson junctions; Low voltage; Noise measurement; Superconducting device noise; Superconducting integrated circuits; Synthesizers; Temperature;
Conference_Titel :
Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on
Conference_Location :
Ottawa, Ontario, Canada
Print_ISBN :
0-7803-7242-5
DOI :
10.1109/CPEM.2002.1034907
