The signal processing circuit

Posted on Mar 28, 2007

It works semiconductor color sensor can be summarized as follows. The figure shows the spectral response curve of two photodiodes have a point of intersection, when the wavelength of the light incident on the corresponding intersection,

The signal processing circuit
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flow through both diodes current k- ostrich and I are equal, since symmetry A signal processing circuit 7-23 resistance, output voltage Uo = o. When the incident grew up in the ^. When, by the FIG know, Isu Ia-i. The output voltage Uo 0} when the incident wavelength less than ^. When the output voltage Up <o. This is illustrated in FIG. In the signal processing circuit, the diode VD3 and VD4 should have the same logarithmic characteristic j, respectively, to achieve the number of photoelectric signal compression, motion compensating circuit smaller dynamic range deficiencies.

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