Integrating circuit and approaching detection chip

Abstract

The invention discloses an integrating circuit, and the integrating circuit comprises a first integrating module and a second integrating module. At a first mode, the first integrating module carried out the first integrating of an input current. At a second module, the second integrating module carries out the second integrating of the input current, and reduces the results of the first integrating. The invention also discloses an approaching detection chip, and the chip comprises a light-emitting diode, a photodiode, the integrating circuit, an analog-digital converter, and a control circuit. The chip can effectively eliminate the interference from ambient light, improves the detection precision, not only is suitable for a condition of short distance, but also is suitable for a condition of long distance.

Description

technical field [0001] The invention relates to the field of analog signal circuits, in particular to an integrating circuit and a proximity detection chip. Background technique [0002] The proximity detection chip can detect the presence of an object and the distance of the object from the proximity detection chip. Proximity detection chips are used in a wide range of applications, such as speed detection, human hand detection in automatic faucets, automatic counting or inspection of objects on conveyor belts, and paper edge detection in printers. [0003] When a photoelectric proximity detection chip detects a target object, it first emits detection light (usually infrared light) to the target object, and then detects the intensity of the detection light reflected back by the target object through a photodiode. The photodiode generates a photocurrent after being irradiated by light. The intensity of the photocurrent is inversely proportional to the distance from the targ...

AI Technical Summary

Problems solved by technology

The interference of ambient light seriously affects the accuracy of the pro

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