RAMP GENERATION CIRCUIT USING A CURRENT DIVIDING METHOD OF A CMOS IMAGE SENSOR AND AN IMAGE SENSOR FOR THE SAME

摘要

PURPOSE: A ramp generation circuit using a current dividing method of a CMOS(Complementary Metal Oxide Semiconductor) image sensor is provided to reduce the generation of a noise by minimizing the switching of a digital circuit. ;CONSTITUTION: A ramp signal generating circuit(120) comprises a reference power setting unit(220) and a ramp signal generating unit(240). The reference power setting unit sets a reference power level. The ramp signal generating unit charges a previously prepared capacitive device through the reference power. ramp signal generating unit discharges the capacitive element by adjusting the amount of a current which is delivered to a capacitive element. The ramp signal generating unit outputs a signal which representing the progress of the discharge change as a ramp signal.;COPYRIGHT KIPO 2011