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6 records (took 0.017 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE2810649A1

    公开(公告)日：1979-01-04

    申请号：DE2810649

    申请日：1978-03-11

    Applicant: IBM

    Inventor： GHEEWALA TUSHAR RAMESH

    IPC: H01L27/18 ,  H01L39/22 ,  H03K17/92 ,  H03K19/195 ,  H03F19/00 ,  G11C11/44

    Abstract: TWO-PORT CURRENT INJECTION INTERFEROMETER AMPLIFIERS AND LOGIC CIRCUITS Josephson junction interferometers having nonlinear switching or threshold characteristics are disclosed. The nonlinear threshold characteristic is achieved in a preferred manner by applying an injection current to the interferometer at a point on the interferometer which is different from where its gate current is normally applied. The resulting nonlinearity provides for high amplification. The nonlinear switching characteristic may also be achieved by applying an injection current to the same point on the interferometer where_the gate current is normally applied. However, a portion of the thus-applied injection current is electromagnetically coupled to the interferometer inductance to achieve the desired nonlinear switching characteristic. Parameters such as the injection current, the gate current, physical point of application of the injection current to the interferometer, junction currents and the inductance of the interferometer may be changed to tailor the threshold characteristic to provide a desired nonlinearity. Logic circuits such as AND, OR and INHIBIT circuits in addition to the basic amplifier circuit are also disclosed.

    INJECTION-CURRENT CONTROLLED CIRCUIT EQUIPPED WITH JOSEPHSON ELEMENTS AND ITS APPLICATION TO LOGICAL CIRCUITRIES
    3.
    发明专利
    INJECTION-CURRENT CONTROLLED CIRCUIT EQUIPPED WITH JOSEPHSON ELEMENTS AND ITS APPLICATION TO LOGICAL CIRCUITRIES 未知

    公开(公告)号：DE3064367D1

    公开(公告)日：1983-09-01

    申请号：DE3064367

    申请日：1980-04-10

    Applicant: IBM

    Inventor： GHEEWALA TUSHAR RAMESH

    IPC: H03K3/38 ,  H01L39/22 ,  H03K17/92 ,  H03K19/195

    Abstract: Direct coupled, nonlinear injection logic circuits having high gain, good isolation between input and output, the capability of parallel fan-in and fan-out, and which do not require a large area. These circuits are comprised of a first stage that isolates the input from the output and other stages which can be used for additional gain, or for building logic circits, such as AND, and DOT-OR. The first stage isolation is a parallel network comprised of two circuits, each circuit of which includes a series connection of resistor-Josephson tunnelling device. A gate current Ig flows through each Josephson device when the devices are in their zero voltage states. An input current Ic is injected into one of the parallel circuits while an output is taken from the other parallel circuit. When an input current is injected, one of the Josephson devices is switched to the nonzero voltage state, which then causes a greater amount of gate current Ig to be switched to the other Josephson device, thereby also switching it to the nonzero voltage state. The gate current is then delivered to a load, or used as an input to other stages of a logic circuit. Complete isolation between input and output is achieved by the two Josephson devices in their nonzero voltage states.

    GUARDED SUPERCONDUCTIVE CIRCUIT
    4.
    发明专利
    GUARDED SUPERCONDUCTIVE CIRCUIT 未知

    公开(公告)号：DE3170605D1

    公开(公告)日：1985-06-27

    申请号：DE3170605

    申请日：1981-08-19

    Applicant: IBM

    Inventor： CHANG WEN HSING ,  GHEEWALA TUSHAR RAMESH ,  HARRIS ERIK PRESTON

    IPC: H01L27/18 ,  H01L39/02 ,  H01L39/22 ,  H01L39/08

    Abstract: In superconductive circuitry including a superconducting ground plane (18), a magnetic flux trapping moat (24) is provided which surrounds a superconductive device (I). The moat is preferably a cut through the superconducting ground plane which extends along a perimeter surrounding the superconducting device, the moat being continuous except for small regions (26) where there is no cut. The small regions serve as current carrying portions to link the ground plane within the moat to the rest of the ground plane outside of the moat. The moat is a flux pinning center so that magnetic flux does not enter the ground plane region located near the superconducting device.

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