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分析红外接近传感器的工作原理,针对红外接近传感器容易受到环境噪声影响而发生检测错误的问题,提出一种高效的环境噪声抑制方法.该方法通过光学镀膜滤波和基于时序控制的数字模拟混合减法电路,分步滤除环境噪声,达到准确接近检测目标的目的.设计了相关传感器电路,可以在太阳光或灯光光照度低于4 000lx,温度低于85℃的环境下,实现25cm范围内的物体接近程度的准确测定.在相同工艺下,通过Spec-tre进行仿真,结果表明:该传感器在给定的噪声环境中工作与无环境噪声的理想情况相比,最大误差不超过1%.所设计电路已在0.35μm 3VCMOS工艺下投片验证,结果满足设计指标.
This paper analyzes the working principle of infrared proximity sensor and puts forward a highly efficient method of suppressing environmental noise in view of the problem that the infrared proximity sensor is easily affected by the environmental noise and the detection error.This method uses optical coating filter and digital simulation hybrid subtraction circuit based on timing control , Step-by-step filter out the environmental noise, to achieve the exact target of detection.Designed a sensor circuit that can sunlight or light illumination less than 4000lx, the temperature is below 85 ℃ environment, the object within 25cm close to The results of Spec-tre simulation show that the maximum error of this sensor is less than 1% when compared with the ideal case without any environmental noise in a given noise environment.The designed circuit Has been 0.35μm 3VCMOS process under the chip validation, the results meet the design specifications.