%0 Journal Article %A H. A. Majid and N. Razali and M. S. Sulaiman and A. K. A'ain %D 2009 %J International Journal of Electronics and Communication Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 31, 2009 %T A Capacitive Sensor Interface Circuit Based on Phase Differential Method %U https://publications.waset.org/pdf/10448 %V 31 %X A new interface circuit for capacitive sensor is presented. This paper presents the design and simulation of soil moisture capacitive sensor interface circuit based on phase differential technique. The circuit has been designed and fabricated using MIMOS- 0.35"m CMOS technology. Simulation and test results show linear characteristic from 36 – 52 degree phase difference, representing 0 – 100% in soil moisture level. Test result shows the circuit has sensitivity of 0.79mV/0.10 phase difference, translating into resolution of 10% soil moisture level. %P 1481 - 1484