| US 7,501,877 B2 | ||
| Superconducting single flux quantum modulator circuit | ||
| Futoshi Furuta, Kokubunji (Japan); and Kazuo Saitoh, Kodaira (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Jun. 08, 2007, as Appl. No. 11/808,337. | ||
| Claims priority of application No. 2006-160615 (JP), filed on Jun. 09, 2006. | ||
| Prior Publication US 2008/0129368 A1, Jun. 05, 2008 | ||
| Int. Cl. H03K 17/92 (2006.01) | ||
| U.S. Cl. 327—367 [326/4; 341/133; 341/171] | 14 Claims |
| 1. A single flux quantum modulator circuit comprising:
a pair of junctions constituted of two Josephson junctions connected in series, wherein one end of one of the two Josephson
junctions is grounded;
a first inductor, one end of which is connected to a junction point between the Josephson junctions constituting the pair
of junctions;
a Josephson junction that is connected to the other end of the first inductor, one end of the Josephson junction being grounded;
and
a second inductor that is magnetically coupled to the first inductor, wherein:
an analog input current is applied to the second inductor; a first single flux quantum clock signal is inputted into the other
end of the pair of junctions; a second single flux quantum clock signal whose period is longer than that of the first single
flux quantum clock signal is inputted into a junction point between the first inductor and the Josephson junction; and a voltage
signal at the junction point between the Josephson junctions constituting the pair of junctions is output as a single flux
quantum pulse.
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