Model for response nonuniformity calculations of a direct-injection readout hybrid focal plane array

Vishnu Gopal

doi:10.1117/12.160871

1 March 1994 Model for response nonuniformity calculations of a direct-injection readout hybrid focal plane array

Vishnu Gopal

Author Affiliations +

Optical Engineering, Vol. 33, Issue 3, (March 1994). https://doi.org/10.1117/12.160871

Abstract

A model for the calculation of rms response nonuniformity in a direct-injection readout mercury cadmium telluride hybrid focal plane array is presented. The model includes contributions from detector material composition variations, processing-induced variations, threshold voltage variations in the input structure of the readout multiplexer, and transfer efficiency variations in the case of CCD-based readouts. The model is then used to analyze the role of the buffered direct-injection (BDI) circuit in controlling the nonuniformity. It is predicted that a minimum BDI gain of 10 is required to reduce the nonuniformity of long-wavelength infrared focal plane arrays (LWIR FPAs) to its minimum value limited by the compositional variations in detector material. This gain requirement is expected to go up with a reduction in the resistance-area product of photodiodes resulting from either imperfect processing or increased cutoff wavelength (λ_co > 9.43 μm).

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Vishnu Gopal "Model for response nonuniformity calculations of a direct-injection readout hybrid focal plane array," Optical Engineering 33(3), (1 March 1994). https://doi.org/10.1117/12.160871

Published: 1 March 1994

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