环境噪声抑制的红外接近传感器设计  

Design of an infrared proximity sensor with environment noise suppression

作　　者：史凌峰[1,2] 刘玉芳[1,2] 何惠森[1,2] 赵永瑞[1,2] 

机构地区：[1]西安电子科技大学电路设计CAD研究所 [2]超高速电路设计与电磁兼容教育部重点实验室,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2012年第2期71-76,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60876023);西安电子科技大学超高速电路设计与电磁兼容教育部重点实验室资助项目

摘　　要：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.Fundamentals of infrared proximity cannot sense proximity correctly with the effect light, light and temperature change. A kind of sensor was proposed. The infrared proximity sensor of environment noise, such as the interference of sunhighly effective method of environment noise suppres-sion was proposed based on the problem, which employed optical filming filter and sequential controlling digital-analog mixed subtraction circuit to remove environment noise step by step, achieving the purpose of accurate proximity sensing. Moreover, the sensor circuit was designed, which could sensethe proximity of object at a distance up to 25 sunlight or the light illumination lowe circuit was verified by Spectre simulat the given noise environment the sense 0.3 5μm 3 V CMOS process. r than 4 ion in th error is cm away from the sensor under the environment of the 000 lx and temperature lower than 85℃. The designed e same process. The simulation results show that under less than 1%.The designed structure is implemented in

关 键 词：数字接近传感器 光电二极管 红外 环境噪声抑制 光学镀膜滤波 数模混合减法电路 

分 类 号：TN43[电子电信—微电子学与固体电子学]