A 1.4-μm pixel-pitch high-speed floating-gate image sensor with a temperature self-correction circuit

A high-speed floating-gate image sensor with a self-correction circuit has been proposed. The reference voltages are generated for the ramp circuit, having the same temperature characteristics as the threshold voltage of pixel units. At the same time, the integration time is consistent with that at normal temperature (27°C). Thus, the range of the ramp voltage can be dynamically adjusted with temperature changes. Additionally, the frame rate of the image sensor is greatly improved by using the bilateral column readout circuits and compact timing design. Simulation results show that when the temperature changes from −30°C to 125°C, the output voltage error of the sensor can be reduced to less than 1 mV, and the frame rate can reach 122 fps.