A CMOS Capsaicin Concentration Converter with Auto-Sensitivity Control Circuits for Sensing Scoville Scale Applications

A CMOS capsaicin concentration converter with auto-sensitivity control circuits is newly used for sensing Scoville scale applications. The proposed converter can transform capsaicin concentration into duty cycle linearly. In addition, the auto-sensitivity control circuits could automatically adjust the sensitivities under different capsaicin concentration intervals. For some patients, under low capsaicin concentration, harmful issues become an important issue for human body. With this functionality of auto-sensitivity control circuits, it can detect capsaicin concentration more sensitivity under low capsaicin concentration. The input differential voltage range of this proposed converter was from 0.1 to 1.4 V, and the corresponding range of output duty cycle was 12.223 to 95.555 %. The varied sensitivities of the proposed converter were 55.555, 45.444, 33.333, 22.221, and 11.106 %/V. The sensitivities of the whole system were 0.064, 0.039, 0.032, 0.021, and 0.007 %/SHU. The proposed chip could be used for detecting capsaicin concentration applications.