Low-noise preamplifier for photoconductive detectors

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Abstract
High‐performance infrared detectors such as arsenic‐doped silicon (Si:As) and bismuth‐doped silicon (Si:Bi) have been successfully used in ground‐based infrared telescope systems in the 2–20 μm range. Optimum performance (BLIP operation) of these detectors is obtained by using a special feedback amplifier. The advantages of such a system are discussed in conjunction with preliminary data on Si:As and Si:Bi detectors.