An HDR Pixel With Over 60-dB Dynamic Range Enhancement Using In-Pixel Parametric Amplification

This paper discusses a method to enhance the dynamic range (DR) of a conventional CMOS image sensor in low- and high-light environment using in-pixel parametric amplification. The parametric amplification gives a linear and noiseless gain. The source follower in a conventional 4T pixel is used as a capacitor for charge amplification by varying its capacitance periodically. This reconfiguration helps in signal amplification without affecting the pixel fill factor drastically. The simulation results show that over 60-dB DR extension in the low and high illuminations can be achieved enhancing the total DR of the pixel to 120 dB.