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Josephson Junction Sampling Head to Investigate Single Electrical Picosecond Pulses

IP.com Disclosure Number: IPCOM000078278D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Jutzi, WW: AUTHOR [+2]

Abstract

Ultrashort single electrical pulses are fed into an arrangement of strip lines and of equidistantly spaced Josephson junctions. In a manner comparable with two-quantum fluorescence in optical pulse investigation, an overlapping zone of oppositely running partial pulses is created within the sampling head, by either suitable pulse dividing or simply by reflection. A kind of a standing Pulse pattern developed by this super-position which corresponds to the respective correlation function. The amplitudes of the waveform are sufficiently large to switch a certain number of junctions from their superconducting into their finite-voltage state.

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Josephson Junction Sampling Head to Investigate Single Electrical Picosecond Pulses

Ultrashort single electrical pulses are fed into an arrangement of strip lines and of equidistantly spaced Josephson junctions. In a manner comparable with two-quantum fluorescence in optical pulse investigation, an overlapping zone of oppositely running partial pulses is created within the sampling head, by either suitable pulse dividing or simply by reflection. A kind of a standing Pulse pattern developed by this super-position which corresponds to the respective correlation function. The amplitudes of the waveform are sufficiently large to switch a certain number of junctions from their superconducting into their finite-voltage state.

From the spacing of sensing junctions, the pulse propagation velocity and the switching thresholds of triggered junctions, one can deduce by deconvolution amplitude, duration and shape of the pulses investigated. Timing problems are eliminated by obtaining the second partial pulse from the original pulse itself.

A series of Josephson junctions within a strip line is fed from both sides with the split pulse. Switching of each junction is measured or detected individually. Another embodiment uses a reflection in a strip line terminated by a short. That line comprises a series of junctions which can be biased by external magnetic fields. It is better to use the signal line as a control line crossing a series of Josephson junction gates. Here the junc...