Four-quadrant sensor circuit

Abstract

The invention relates to the technical field of sensor circuits, in particular to a four-quadrant sensor circuit. The four-quadrant sensor circuit comprises four sub-circuits respectively connected with a four-quadrant sensor. Each sub-circuit comprises an amplifying circuit and a filter circuit, wherein the amplifying circuit is connected with the output end of the four-quadrant sensor, the filter circuit is connected with the output end of the amplifying circuit, and a shunt circuit for noise reduction is connected to the input end of the amplifying circuit. The four-quadrant sensor circuit has the advantages that the shunt circuit for noise reduction is arranged in each sub-circuit of the four-quadrant sensor, the four-quadrant sensor circuit is simple in structure, a good noise reduction effect on signals output by the sensor can be achieved, and system control precision is guaranteed effectively.

Description

technical field [0001] The invention relates to the technical field of sensor circuits, in particular to a four-quadrant sensor circuit. Background technique [0002] Four-quadrant sensors are widely used in laser alignment, angle measurement, automatic tracking and laser guidance and other fields. The four-quadrant sensor is composed of four photodiodes with the same performance arranged in four quadrants on a chip according to the requirements of rectangular coordinates, and each photodiode occupies a quadrant. Since the properties of the four photodiodes are exactly the same, the intensity of photocurrent output by each quadrant is proportional to the illuminated area received by each quadrant. When the illumination areas of the four quadrants are the same, the photocurrents output by the four photoresistors are the same; when the illumination intensities of the four quadrants are different, the photocurrents output by the four photodiodes will have obvious differences. ...

AI Technical Summary

Problems solved by technology

[0003] The four-quadrant sensor is used as a receiving and converting device. After the sensor receives light, it outputs weak electrical signals through conversion of four photodiodes. Since the strength of these four electrical signals is very weak, it must be amplified as it is through the circuit. The existing Four-quadrant sensor circuits usually use amplification circuits and filter circuits to amplify and filter electrical signals, but the signal processing, especially filter processing, is often ineffective, which affects the control accuracy of the system.

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