Color sensor amplification circuit

The semiconductor color sensor has
the ability to identify the color of the object being measured, and is composed of 3 photodiodes PD 1, PD2, PD 3
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 reflected light from the object into three colors. After the color signal
is amplified by the operational amplifier,
the actual color output is obtained according to different combinational logic processes. Figure 7-23 is the amplification circuit
of the color sensor , which outputs three colors from X, Y, and Z. A practical application circuit based on color discrimination.