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Optical setup for laboratory characterization of the I/V converter and band-pass filters. The ac and dc light levels of the λ = 640 nm red LED (KINGBRIGHT—L-7104SRC-J4) is controlled by a signal generator (Tektronix AGF3252). The reference photodiode (PDA520) has a known transimpedance gain and is used to calculate the light falling on the CMOS sensor.
