Ramp Signal Generator, and CMOS Image Sensor Using That

This technique is a ramp signal generator and he relates to a CMOS image sensor used, the ramp signal, which can reduce the size of the feedback capacitor using the method of the current subtraction (Substraction) generating device and a CMOS image using the same sensor to provide. The ramp signal generating device, a current supply unit for supplying current; Current subtraction unit for subtracting (Substraction) the current from the current supply section; Reference voltage generation section for generating a reference voltage; And it may include a ramp signal generator for generating a ramp signal in accordance with the reference voltage from the current and the reference voltage generating portion from the current subtraction unit.