A Wide-Range Sugar Concentration to Duty Cycle Converter with Scaling Circuits for Detecting Sugar Concentration Applications

A wide-range sugar (glucose) concentration to duty cycle converter with scaling circuits is newly used to measure the sugar concentration of livestock drinking solution. It consists of a glucose sensor and the presented glucose concentration sensor transducer. The presented glucose concentration sensor transducer can convert glucose concentration to a duty cycle result linearly. Besides, a scaling technique to make sensors equipped with largest sensitivity was also added. After scaling, the sensors generate the maximum range of input current ranged from 30 nA to 3 mA, and the range of output duty cycle was 0 to 99.96 %. The presented chip is 1.13 × 1.13 mm
²
. Finally, the chip can be transmitted to back-end digital systems easily, namely mobile devices which can immediately demonstrate the data of the glucose concentration.