Color sensor amplification circuit

Semiconductor color sensors have the ability to identify the color of the object being measured. It consists of 3 photodiodes VD1, VD2, VD3 and 3 color
filters X- PHOTO , Y-PHOTO and Z- PHOTO
. Each photodiode is equipped with a red (R), green
(G), and blue (B) color filter to decompose the X-ray light from the object
into three colors. After the color signal is amplified by the operational amplifier
, the actual color
output is obtained after processing according to different combinational logic. The picture shows the amplification circuit of the color sensor , which outputs three colors from X, Y, and Z. Figure 11-26 is a practical application circuit of color discrimination based on the figure.