Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-02-06
1992-03-24
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307306, H03K 19195
Patent
active
050991523
ABSTRACT:
A superconducting circuit for performing a logic operation and producing an output indicative of the result of the logic operation with a logic amplitude suitable for processing by an external circuit, is provided by a Josephson processing circuit which performs the logic operation and produces an output logic signal with a first logic amplitude, a voltage amplification circuit which is supplied with the output logic signal from the Josephson processing circuit and produces an output signal having a second logic amplitude which is substantially larger than the first logic amplitude, and an impedance conversion circuit which is supplied with the output signal of the voltage amplification means and produces the output of the superconducting circuit, with an output impedance suitable for transferring to the external circuit. The voltage amplification circuit includes a plurality of superconducting quantum devices connected in series and produces the output signal of the second logic amplitude as a sum of the voltage transitions caused in response to the respective transitions of the Josephson junctions included therein. The impedance conversion circuit provides a high input impedance such that the operation of the voltage amplification circuit is not influenced by the current associated with the output signal to the impedance conversion circuit.
REFERENCES:
patent: 4559459 (1985-12-01), Wang et al.
patent: 4672244 (1987-06-01), Harada et al.
patent: 4897558 (1990-01-01), Tidman
patent: 4956642 (1990-09-01), Harada
patent: 4980580 (1990-12-01), Ghoshal
Fujitsu Limited
Sanders Andrew
Westin Edward P.
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