C13440-20CU / C13440-20CU01 Instruction manual_Ver.1.3
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10. DESCRIPTION OF CMOS IMAGE SENSOR
10-1 THEORY OF CMOS IMAGE SENSOR
The pixel of a CMOS image sensor is composed of the photodiode and the amplifier that converts
the charge into voltage. Entered light is converted to charge and converted to voltage in the pixel.
The voltage of each pixel is output by switching the switch one by one. (Figure 10-1)
The scientific CMOS image sensor used in this camera has an on-chip CDS (correlated double
sampling) circuit, which plays an important role in achieving low noise. In addition, CMOS image
sensor realizes both low noise and high speed readout simultaneously, by a split readout scheme
in which the top and the bottom halves of the sensor are readout independently, and the data of
each horizontal line is read by 2 lines of column amplifier and A/D in the top and the bottom in
parallel and simultaneously.
Figure 10-1 Structure of CMOS image sensor
