%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