Dr.Suhaidi Shafie is a Senior Lecturer in The Department of Electrical and Electronic Engineering, Universiti Putra Malaysia. He is also attached to the Functional Device Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia as a Research Associate. His research interests are sensing devices, sensors interface circuits and sensory systems. He has worked on development of low power transmitter for capsule endoscope, and sensory system for electronic water sensing and measurement system. He also working closely with MIMOS Berhad on development of low power analog-to-digital converter. Dr.Suhaidi was with ALPS Electric Malaysia for 2 years as Design Engineer working on analogue video tuner. Then he pursue his education and received PhD in Nanovision Engineering from Shizuoka University, Japan in 2008. He has published several papers on sensors and sensory systems and presented his work in IEEE conferences. He is a member of Institute of Electrical and Electronics Engineers (IEEE) and International Association of Engineers (IAENG).
Low Power Up-Conversion Transmitter for Medical Remote Sensing
Low power up-conversion transmitter can be adapted in medical remote sensing such as wireless endoscopy application. Considering the loss against frequency in a body wireless communication, ISM band of 434 MHz is employed in the design of the transmitter. This band has lower loss and relatively higher data rate compared to other standards. With the carrier power of −5 dBm, the proposed mixer has an output inferred 1 dB compression point of −0.5 dBm with a corresponding output third-order intercept point (OIP3) of 7.1 dBm. Inductor less architecture was adopted in the circuit design to reduce the circuit area, thus contribute to the reduction of capsule size. The core component of transmitter, the up-conversion mixer and ring oscillator is realized on CMOS 0.13 μm technology with voltage supply of 1.2 V. Both the mixer and ring oscillator consumes 1.57 mA of current, brings the dc power consumption of the transmitter to be 1.88 mW. Data rate of 3.5 Mbps ensure it can transmit high quality medical imaging. The proposed up-conversion and ring oscillator achieved low power and less area while still having the good performance.