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Damped Bridge-Type Josephson Interferometer

IP.com Disclosure Number: IPCOM000046518D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 139K

Publishing Venue

IBM

Related People

Beha, H: AUTHOR [+3]

Abstract

In order to avoid high resonance amplitudes in interferometer circuits, the interferometer inductance has to be damped directly by low-inductance resistors. Bridge-type interferometer structures incorporating lowinductance damping resistors are disclosed which, compared to damped planar interferometer structures, require substantially less circuit area and thus offer higher circuit density.

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Damped Bridge-Type Josephson Interferometer

In order to avoid high resonance amplitudes in interferometer circuits, the interferometer inductance has to be damped directly by low-inductance resistors. Bridge-type interferometer structures incorporating lowinductance damping resistors are disclosed which, compared to damped planar interferometer structures, require substantially less circuit area and thus offer higher circuit density.

Fig. 1 shows the equivalent circuit of the proposed interferometer. The damping resistor Rl is arranged across the interferometer inductance Ll, L2. The vertical structures of three embodiments of the proposed damped bridge interferometer are illustrated in Figs. 2 to 4 in which the various layers are designated as follows: M1 = groundplane (Nb) I1 = insulation (SiO)

R1 = damping resistor (AuPd) Ires = resistor insulation (MgO) M2 = base electrode (Nb)

I2'I2'= insulation (SiO)

Iox = insulating oxide (Nb2O5)

M3 = counter electrode (PbAuPd)

M3' = bridge (PbAuPd)

Materials different from those indicated above can be employed. Also, the basic structural concept, disclosed in Figs. 2 to 4 with reference to edge-junction structures, may be applied for planar-junction bridge interferometers as well.

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