Noise Analysis and Measurement for Active Pixel Sensor Readout Methods - Paperbackby Dali Wu (Author) A detailed experimental and theoretical investigation of noise in both current mode and voltage mode amorphous silicon (a Si) active pixel sensors (APS) has been performed. Both flicker (1 f) and thermal are considered in this study. The experimental result in this paper emphasizes the computation of the output noise variance. The theoretical analysis shows that the voltage mode APS has an advantage over the current mode APS in