Title :
Improvements of the AC quantum voltmeter
Author :
Behr, R. ; Palafox, L. ; Kohlmann, J.
Author_Institution :
Phys.-Tech. Bundesanstalt, Braunschweig
Abstract :
The AC quantum voltmeter, an instrument for measuring AC waveforms by comparing them to a Josephson waveform, has been enhanced. Two different improvements to the signal-to-noise ratio are presented. The signal amplitude has been significantly increased by using 10-V Josephson arrays. The noise contribution has been reduced by adding a preamplifier at the input of the sampling null detector.
Keywords :
Josephson effect; preamplifiers; superconducting arrays; voltage measurement; voltmeters; AC quantum voltmeter; AC waveforms measurement; Josephson arrays; Josephson waveform; preamplifier; sampling null detector; signal amplitude; signal-to-noise ratio; voltage 10 V; Frequency; Microwave antenna arrays; Noise reduction; Preamplifiers; Sampling methods; Signal to noise ratio; Synthesizers; Time measurement; Voltage measurement; Voltmeters;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574644
