16-11-2010, 04:53 PM
The concepts of Wireless Sensor Networks and its issues like, energy efficiency, reduce communication bandwidth for maximize battery life, dynamically changed topology, WSN need a low rate inter sensor communication is required so required compression –estimation sensor. Classified as two Fusion Center(FC) and Adhoc WSNs. Another paper relating to this area :
• Jia Mengl , Husheng Li2 , and Zhu Hanl, " Sparse Event Detection in Wireless Sensor Networks using Compressive Sensing", on information theory , may 2009.
describes a a circuit based on a bandgap reference voltage and a CMOS circuit similar to a beta multiplier. An NMOS transistor in triode region has been used in place of a resistor in conventional beta multiplier. The BGR voltage has a positive temperature coefficient to cancel the negative temperature coefficient of the beta multiplie.r
• Bendali A., Audet Y., “A 1-V CMOS current reference with temperature and process compensation”, IEEE Trans. Circuits Syst. I, vol. 54, no. 2, 2007
Temperature compensation is achieved from a bandgap reference using a transimpedence amplifier an intermediate voltage reference is generated. This voltage applied to the gate of a carefully sized nMOS output transistor provides a reference drain current independent of temperature by mutual compensation of mobility and threshold voltage variations
• M. Filanovsky, A. Allam, “Mutual compensation of mobility and threshold voltage temperature effects with applications in CMOS”, IEEE Trans. Circuits Syst. I, Fundam. Theory Appl., vol. 48, no. 7,Jul. 2001.
Mutual compensation of mobility and threshold voltage temperature effects in MOS transistors to obtain ZTC is analysed. A simple voltage reference circuit realized in 0.35- m CMOS process at this bias point.
• S-Edit User Guide
• B. Razavi, “Design of Analog CMOS Integrated Circuits”, Boston, MA: McGraw-Hill, 2001
Outcome :
• Basic working of MOSFET and its characteristics and short channel effects
• Tanner tool and circuit simulation using S-edit
• Current mirror working and applications and temperature and supply voltage compensation in current reference circuits
• Basic working of FGMOSFET
Next task:
• Study of programmability of FGMOSFET to obtain various current values using a single circuit
• Layout design using Tanner (L-edit)
COMPRESSIVE SENSING IN WIRELESS NETWORKS.pdf (Size: 85.36 KB / Downloads: 114)