基于互补金属氧化物半导体的高精度地沟油检测计

利用地沟油与正常食用油的导电率不同导致单位体积电阻不同,提出一种基于互补金属氧化物半导体工艺(Complementary Metal Oxide Semiconductor,CMOS)的线性检测模块。由于使用直接选择与短接到地的方法实现电阻串分压,使得分压线性度更高。在脉冲计数的作用下,电阻分压通过与参考电压相比较可以得到不同的高电平数,不仅可以区分地沟油与正常食用油,还可以得出正常油掺入地沟油的质量分数。在检测计核心电路设计方面,由于采用CMOS工艺设计,所以可以实现低面积和低功耗的检测。

A high precious gutter oil detector based on complementary metal oxide semiconductor

Since the different conductivity of gutter oil and edible oil normally result in the different resistivity per unit volume, a linear detection module based on CMOS (Complementary Metal Oxide Semiconductor) was designed, which shorted to ground combined with directly selection the resistor string to divide voltage makes more linear precision voltage divider. Under the action of counting pulse, the count resistor divider compares with the reference voltage to achieve different number of high level, which not only can distinguish gutter oil and edible oil, but also come to the mass fraction of edible oil, which incorporates gutter oil. In the design of core circuit of detector, this detector is easy to achieve low area and low power base on CMOS.