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Evaluation of dynamic range for an HTS sigma-delta modulator with 100-GHz sampling

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5 Author(s)
K. Saitoh ; Adv. Res. Lab., Hitachi Ltd., Tokyo, Japan ; Y. Soutome ; T. Fukazawa ; F. Furuta
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Circuit simulations were used to study the capability of a high-temperature superconducting (HTS) sigma-delta modulator using interface-engineered-Josephson junctions (IEJ's). The dynamic range was calculated while varying the temperature (T) and input-signal frequency (f0), and in the resultant power spectra, correct noise shaping (6 dB/oct) was found. Investigation of the dynamic range in terms of effective number of bits (ENOB) showed that ENOB was 6.7 for f0<200 MHz and T<40 K. At higher input-signal frequencies, i.e., 400 MHz0<1 GHz, ENOB was determined to be in the range 3.240 K.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )