Silego: Precise measurement with quadrant photodiode

By Silego Technology Inc.
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This application note explains how to use a low-voltage, low-noise quadrant photodiode for high-precision displacement measurement via a moving light spot on the surface of the diode. The note suggests accompanying circuitry and describes how to bias the circuit and provides supporting maths for determining measurements. It is shown how to find the frequency response of the circuit and an example implementation is given. Read More

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