Referenced Items are not available for this document.
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:
Applied Superconductivity, IEEE Transactions on
(Volume:13
,
Issue:
2
)
Date of Publication: June 2003
- Page(s):
- 488 - 491
- ISSN :
- 1051-8223
- INSPEC Accession Number:
- 7715394
- Digital Object Identifier :
- 10.1109/TASC.2003.813913
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 15 July 2003
- Issue Date :
- June 2003
- Sponsored by :
- The IEEE Council on Superconductivity
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