A CMOS Algae Growth Period to Duty Cycle Converter for Monitoring Algae Growth Status Applications

A CMOS algae growth period converter is newly used for applications of monitoring algae growth status. The proposed converter can transform algae growth period into duty cycle linearly. Through the duty cycle of this converter, the algae growth status could be easily and quickly obtained. A wide rail-to-rail voltage to current converter and the adjustment sensitivity circuits are designed to be adaptively used in different kinds of algae growth environment. The wide-range differential voltage is -1.5 to 1.5 V, the corresponding range of output duty cycle was 1.46 to 98.4643 %. The various sensitivities of the proposed converter were 23.496, 27. 37S, 32.S04, and 41.209%/V. The proposed chip could be used for monitoring algae growth status applications.