ACTIVE PIXEL CIRCUIT OF CMOS IMAGE SENSOR

摘要

PURPOSE: An active pixel circuit of a CMOS(Complementary Metal Oxide Semiconductor) image sensor is provided to improve the quality of image by having the same characteristic and output as a CCD(charge coupled device). CONSTITUTION: A photodiode region generates a signal charge by irradiating light. The first transfer transistor(48) switches a transfer signal of the signal charge by a column selective signal. The second transfer transistor(49) turns on by the switched transfer signal, and transfers the signal charge to the first floating node(46). A source follower driver transistor(45) changes the potential of the second floating node(47) by the signal charge charged in the first floating node(46). A line select transistor(50) reads out the potential level of the second floating node(47) by a line select signal. A reset transistor(43) resets the charge charged in the first floating node(46).