Wireless network has been emerged as one of the most promising technologies for sensor-integrated applications so far. The ever-increasing demand in long-term chronic monitoring of vital or essential signals is driving a technology revolution in dealing with critical issues of clinical, healthcare, fitness, and wellness, creating multidisciplinary collaborations to benefit mankind. The voltage-controlled oscillator has been one of the important building blocks in this regard. In this paper, we report on study concerning the design and implementation of such a key circuit, with particular emphasis on a μW-level low-power design. All the aspects regarding the oscillator are detailed. The proposed circuit structure and experimental results justifying our work are given as proof of concept.

A network of mobile cooperative sensors is considered. The followingproblems are studied:(1) the “optimal" deployment of the sensors on a given territory;(2) the detection of local anomalies in the noisy data measured by thesensors.In absence of an information fusion center in the network, from “local" interactions between sensors “global" solutions of these problems are found.