期刊名称：International Journal of Computer Science Issues
印刷版ISSN：1694-0784
电子版ISSN：1694-0814
出版年度：2012
卷号：9
期号：6
出版社：IJCSI Press
摘要：Spectrum tuning and meeting low power are the main challenges in impulse radio ultra-wideband (IR-UWB) system while it has the highest level of prospects in contactless and continuous vital sign monitoring. In this paper, an IR-UWB transmitter is designed for the most desirable feature of IR-UWB that is exact spectral tuning along with the lowest energy consumption ever reported which is solved using underdamped operation of an RLC circuit incorporated with three step amplitude tuning. Highly selective underdamped circuit is used to reduce the sideband spectral component that reduces signal power and hence energy consumption. Exact damping of oscillation is implemented using negative impedance effect of a source follower with positive feedback. Results of the presented design are carried out in Advanced Design System 2009. Exact spectrum generation with center frequency 5, 7 and 9GHz of 2GHz bandwidth is tested. The maximum power transmission is set below -41dBm per MHz and the energy consumption is only 3.51pJ per pulse per 1.2V supply.
