Patent ID: 6777808
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A single flux quantum transmission line comprising:a plurality of SQUIDs, said plurality of SQUIDs being arranged in a serial order and each of said plurality of SQUIDs including a respective circuit common, an input and an output; said plurality of SQUIDs further including at least: an input SQUID for receiving a single flux quantum pulse at an input end of said transmission line and, responsive thereto, for providing a single flux quantum pulse at an output, said input SQUID being first in said serial order; and an output SQUID for receiving a single flux quantum pulse at an input and, responsive thereto, for providing a single flux quantum pulse at an output of said transmission line, said output SQUID being last in said serial order; a source of DC bias current, said source having a current output terminal and a current return terminal; said current output terminal of said source being connected to said input of said input SQUID; said current return terminal of said source being connected to said circuit common of said output SQUID; and each said circuit common of said plurality of SQUIDs other than said output SQUID being connected to said input of the next SQUID in said serial order to define a series current path from said source through said plurality of SQUIDs; means for connecting said input of said input SQUID to a first polarity terminal of an SFQ pulse source; means for connecting said circuit common of said input SQUID to a second polarity terminal of said SFQ source; a first plurality of capacitors, said first plurality being equal to one less than the number of SQUIDs in said plurality of SQUIDs; a second plurality of capacitors, said second plurality being equal in number to said first plurality of capacitors; each capacitor in said first plurality of capacitors being coupled between an output of a respective SQUID and the input of a next SQUID in said serial order for coupling a single flux quantum pulse from said respective SQUID to said next SQUID in said serial order; each capacitor in said second plurality being connected between the circuit common of a respective SQUID and the circuit common of the next SQUID in said serial order for providing an AC coupling between said plurality of circuit commons and maintaining DC isolation therebetween.