Underdamped Josephson transmission line
AssigneeTRW Inc.
InventorMark W. Johnson
Life of this patent
Estimating the term…
Abstract
A Josephson junction transmission line (50) for transmitting single flux quantum pulses. The transmission line (50) includes a current source (53), a plurality of isolation inductors (52, 54) electrically coupled in series along the transmission line (50), and a plurality of Josephson junction circuits (60, 70) electrically coupled in parallel along the transmission line (50). Each of the Josephson junction circuits (60, 70) includes only a Josephson junction (62, 72) and a parasitic inductor (64, 74) coupled in series. The Josephson junction circuits (60, 70) do not include a damping resistor in order to reduce timing uncertainty and to enhance propagation speed.
Claims9
A Josephson junction transmission line for transmitting single flux quantum pulses, said transmission line comprising:
- a current source;
- a plurality of isolation inductors electrically coupled in series along said transmission line;
- damping elements coupled in parallel with each isolation inductor;
- and
- a plurality of Josephson junction circuits electrically coupled in parallel along said transmission line, each junction circuit including a Josephson junction, wherein each Josephson junction is biased with about 30% of a critical current of the Josephson junction in order to prevent said transmission line from going into a voltage state.
A Josephson transmission line for transmitting single flux quantum pulses, said transmission line comprising:
- a current source;
- a plurality of isolation inductors electrically coupled in series along said transmission line;
- and
- a plurality of Josephson junction circuits electrically coupled in parallel along said transmission line, each Josephson Junction circuit being biased with current from said current source, wherein each Josephson junction circuit includes a Josephson junction having an underdamped response characteristic for providing reduced current noise and reduced timing uncertainty to increase the pulse propagation speed.
A Josephson junction transmission line for transmitting single flux quantum pulses, said transmission line comprising:
- a current source;
- a plurality of isolation inductors electrically coupled in series along said transmission line;
- and
- a plurality of Josephson junction circuits electrically coupled in parallel along said transmission line, each junction circuit including a Josephson junction, wherein each Josephson junction is biased with about 30% of a critical current of the Josephson junction in order to prevent said transmission line from going into a voltage state.
Dependencies are inferred from the claim text.