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16 August 2000 Matrix readout for superconducting tunnel junction arrays
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We report on the design and testing of a new readout scheme for Superconducting Tunnel Junction (STJ) arrays. By grouping the electrodes in rows and columns, this method drastically reduces the number of connections and electronic circuits required for reading out a large format array of pixelated detectors. It is a generic scheme in that it could be applied to different kinds of detector arrays. Using charge sensitive amplifiers with junction field-effect transistors we verify that the energy resolution degrades primarily due to capacitance increase at the amplifier's input node. However, since each detector is read-out by two independent circuits, these two outputs can be combined to increase the signal-to-noise level. The measurements reported here were carried out on an array of 6 by 6 junctions. All junctions were biased but only 2 rows and 2 columns read-out. We compare the result to measurement carried out on a similar 6 by 6 array fabricated from the same trilayer but with individual pixel read-out. The measurements show that stable biasing of STJs is possible with the new configuration and that the measured optical spectral line resolutions are consistent with our theoretical predictions.
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Didier D. E. Martin, Peter Verhoeve, Anthony J. Peacock, and D. J. Goldie "Matrix readout for superconducting tunnel junction arrays", Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000);

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