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A Differential Current-to-Time Interval Converter Using Current-Tunable Schmitt Triggers
정원섭 한국전기전자학회 2017 전기전자학회논문지 Vol.21 No.4
A differential current-to-time interval converter is presented for current mode sensors. It consists of a ramp voltage generator, a current mode sensor, a reference current source, two current-tunable Schmitt triggers, a one-shot multivibrator, and two logic gates. The design principle is to apply a ramp voltage to each input of the two current-tunable Schmitt triggers whose threshold voltages are proportional to the drain current values of the current mode sensors. A proposed circuit converts a current change in the ISFET biosensor into its equivalent pulse width change. A prototype circuit built using TSMC 0.18 nm CMOS process exhibit a conversion sensitivity amounting to 726.9 ㎲/pH over pH variation range of 2-12 and a linearity error less than 0.05 %.
정원섭 안양대학교 사회과학연구소 1997 社會科學硏究 Vol.5 No.-
ABSTRACT The Purpose of this paper is proving the research hypothesis that woman political participation has been influenced by woman's perception toward woman political leaders in Korea. This study concludes that woman supports woman political leaders because woman in general believe woman political leaders might take more positive actions in order to improve woman's socio - economic and socio-political status in Korea. This study also finds that woman political participation has been influenced not by such personal relationships with specific political leaders as regonal and/or academic bond, and family connections but by specific political leadership of woman political leaders such as policy orientations.