The first frame-transfer CMOS active pixel sensor (APS) is reported. T
he sensor architecture integrates an array of active pixels with an ar
ray of passive memory cells. Charge integration amplifier-based readou
t of the memory cells permits binning of pixels for variable resolutio
n imaging. A 32 x 32 element prototype sensor with 24-mu m pixel pitch
was fabricated in 1.2-mu m CMOS and demonstrated.