READOUT CIRCUIT, IMAGE SENSOR, RELATED CHIP, AND ELECTRONIC DEVICE

The present application discloses a readout circuit, comprising a correlated double sampling unit, a signal control unit, a signal synchronization control unit, and an address decoding unit. The correlated double sampling unit stores first sensing voltage generated by a first pixel unit to a first capacitor within a first period of time, and stores second sensing voltage generated by the first pixel unit to a second capacitor within a second period of time. A first input end and a second input end of the signal control unit are respectively coupled to the first capacitor and the second capacitor, and the signal control unit outputs a first readout signal and a second readout signal according to a first address signal and voltage of the first capacitor and the second capacitor, and controls electrical connection between the first input end and the second input end according to a sampling control signal. The signal synchronization control unit updates and generates a synchronous digital address signal and an ef