Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-12-26
1993-07-20
Sikes, William L.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307245, 307541, 257 31, H03K 338, H03K 1792, H03K 508, H01L 3922
Patent
active
052296555
ABSTRACT:
A superconducting active device has dual control inputs and is constructed such that the output of the device is effectively a linear mix of the two input signals. The device is formed of a film of superconducting material on a substrate and has two main conduction channels, each of which includes a weak link region. A first control line extends adjacent to the weak link region in the first channel and a second control line extends adjacent to the weak link region in the second channel. The current flowing from the first channel flows through an internal control line which is also adjacent to the weak link region of the second channel. The weak link regions comprise small links of superconductor, separated by voids, through which the current flows in each channel. Current passed through the control lines causes magnetic flux vortices which propagate across the weak link regions and control the resistance of these regions. The output of the device taken across the input to the main channels and the output of the second main channel and the internal control line will constitute essentially a linear mix of the two input signals imposed on the two control lines. The device is especially suited to microwave applications since it has very low input capacitance, and is well suited to being formed of high temperature superconducting materials since all of the structures may be formed coplanar with one another on a substrate.
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Beyer James B.
Hohenwarter Gert K. G.
Martens Jon S.
Nordman James E.
Phan Trong Quang
Sikes William L.
Wisconsin Alumni Research Foundation
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