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Feedback-current-injection-type second-order lowpass sigma-delta modulator

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6 Author(s)
S. Hirano ; Supercond. Res. Lab., Int. Supercond. Technol. Center, Tokyo, Japan ; H. Hasegawa ; S. Nagasawa ; S. Kato
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In order to establish double-loop feedback design, we have fabricated a prototype superconducting double-loop lowpass sigma-delta modulator. For digital feedback gain, multiple flux quanta are produced by a ladder circuit and carried through Josephson Transmission Lines (JTLs) to the feedback driver. The feedback driver consists of a single Josephson junction or two serially-connected junctions. Direct injection of the pulse current from the JTLs through a low-value resistor drives the feedback driver. The sigma-delta modulator was operated at the sampling frequency of 1.1 GHz and the measured power spectrum showed the noise shaping roughly of 12 dB/octave, which is characteristic of the second-order sigma-delta modulator.

Published in:

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