A CMOS watch-dog sensor for guaranteeing the quality of perishables

Abstract

We developed a CMOS integrated-circuit sensor that simulates the change in quality of various perishables. This sensor is attached to each perishable goods such as farm and marine products and is carried from producers to consumers with the goods. During the distribution process, the sensor experiences the surrounding temperature and simulates the deterioration of the goods that is caused by the temperatures. By reading the output of the sensor, consumers can know whether the goods are fresh or not. This sensor consists of subthreshold CMOS circuits with a low-power consumption of 5 muW or less