Altasens Presents Tapered Reset in 4T Pixel

Altasens presents its new idea on tapered reset usage in 4T pixel on Intertech-Pira Image Sensors 2008 Conference. The pixel has 2 modes of operation. At large signal it works like any other 4T pixel. In low light mode the pixel transistor works in common source mode where the photodiode charge is transferred to its Miller capacitance. This way pixel has a higher gain, so that the column circuitry noise is less important. The slide below shows the idea: