The AVIRIS instrument has a separate dedicated analog signal processing chain for each of its four spectrometers. The signal chains amplify low-level focal-plane line array signals (5-10 mV full-scale span) in the presence of larger multiplexing signals (- 150 mV) providing the data handling system a ten-bit digital word (for each spectrometer) each 1.3 ps. This signal chain provides automatic correction for the line array dark signal nonuniformity (which can approach the full-scale signal span).
James S. Bunn,
"Signal Chain For The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS)", Proc. SPIE 0834, Imaging Spectroscopy II, (1 January 1987); doi: 10.1117/12.942285; https://doi.org/10.1117/12.942285