A new A/D converter with quantum flux parametron
A new flash-type superconducting A/D converter has been proposed. Basic low frequency operation of this converter, which comprises a Quantum Flux Parametron (QFP) and an rf SQUID, has been observed. The rf SQUID consists of a Josephson junction and a load inductor which is part of the QFP. It converts an analog signal to periodical digital signals of one quantum flux (2.07x10/sup -15/W b) per cycle. The QFP works as both an amplifier and a comparator of the periodical digital signals, by adding an exciting signal. This A/D converter is expected to achieve high speed operation of 20GHz by computer simulation. 4bit-A/D converter circuits were fabricated using the conventional Nb/Pb alloy process with a junction size of 5..mu..mx5..mu..m and supercurrent density of 200A/cm/sup 2/. Basic operation at 100kHz was confirmed experimentally.
- Research Organization:
- Quantum Magneto Flux Logic Project, Research Development Corp. of Japan, Kokubunji, Tokyo (JP); Dept. of information science, Univ. of Tokyo, Bunkyo, Tokyo (JP)
- OSTI ID:
- 6090851
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
- Country of Publication:
- United States
- Language:
- English
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