The loop filter is one of the most difficult parts to implement in bandpass continuous-time sigme-dleta modulators. LC filters have been presented as a filtering alternative for modern integrated radio transceivers. It allows the implementation ofon-chip, high Qfilters with high resonance frequencies. This paper describes the implementation of a parallel sixth-order bandpass sigma-delta modulator in 0.35pm CMOS technology. The continuous-time loop filter is based on an integrated LC tank and an improved linear transconductance amplifier. Simulation results show that good noise shaping performances is reached.
Several embedded systems use Wireless Sensor Network (WSN) to monitor an area. However, efficient robust and reliable communication between sensors is hard to achieve. Thus, in this paper we focus on exploration area and we propose a new cooperative strategy. This strategy is based on Cognitive Radio (CR) and Software Defined Radio (SDR) that we consider as a "Smart Communication". These radio systems search for a vacant spectrum band and reconfigures itself satisfying the requirements of any desired communication standard. Several simulation experiments demonstrate that the proposed approach improve exploration strategy.
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