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A special rangefinding system basing upon the triangular ranging principle has been constructed. It equips with an optical system, an interdigital position sensitive device, and a signal processing circuit. The interdigital position sensitive device was created by our laboratory before. It has many advantages that other position sensitive devices don't have. The signal processing circuit was designed according to the working theory of the interdigital position sensitive device. Steps of designing of the IC included SPICE simulation, IC layout and fabrication. Besides, to prove the function of the designed circuit, we setup the optical system and achieved the measurement by infrared light. The result of our measurement shows that the circuit can effectively readout the optical signals and find out the range to be measured.
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