Abstract: This paper presents a survey on CMOS image sensors(CIS) based on active pixel sensors(APS). Due to its properties, the APS is used in low voltage, low power and its applications in portable imaging systems such as disposable cameras and on-chip autonomous security cameras are random access, faster readout and low noise with peripheral circuitry.

Keywords: CMOS image sensors(CIS),Active pixel sensors(APS),Digital pixel sensors(DPS),pulse width modulation(PWM).