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Theses

Design of a Radiofrequency Front-End module for “Smart Dust” sensor network

Abstract : This thesis is an attempt toward design of Ka band RF transceiver for wireless sensor networks (WSN), for which power consumption, cost and size are critical parameters. In sense of power consumption, RF transceiver is the most crucial part of a sensor node. We have chosen STMicroelectronics 90nm global purpose (GP) CMOS technology to achieve low power, low cost and small size. For the first time, we have introduced Ka band in WSN context, to benefit high network immunity and small antenna size. Since the technology we have chosen and the related foundry design kit is not for RF design, we were obliged to develop an individual design tool for millimeter wave band. In this way, we have developed a simple and accurate MOS transistor model, comprising charge and capacitance model, noise model and complete parasitic effects model. We have proposed a new structure for transmission line type inductors and accurate RLGC model has been developed to design and simulation of these inductors. Full wave electromagnetic simulation using HFSS have been used in model parameter extraction for inductors and other passive elements, such as RF pads and T-junctions. As our first experience, we have designed and optimized a 30 GHz LNA, using our design tool. The designed LNA was fabricated in STMicroelectronics 90nm global GP CMOS process and was measured in the IMEP laboratory. The measurement results shows 10dB power gain and 4.8 dB noise figure with 4mW DC power consumption. In the next step we have designed and optimized better 30GHz LNA. Post layout simulation shows 13.9dB power gain and 3.6d noise figre, with only 3mW power consumption. We proposed a simple radio link and a simple transceiver structure. In the receiver we have used heterodyne structure, current reused cross coupled oscillator and even harmonic mixer, to overcome many problems arises in mm-wave band in CMOS technology. The mixer was designed using analysis results and simulated in the foundry design kit: 4dB conversion gain and 5.8 double side-band noise figure with 2.2mW power consumption, an excellent result in comparison with the similar reported works. 2GHz IF stage was designed as multi-slice amplifier-detector chain, to increase the receiver performance and achieve lowest power consumption. Finally, the receiver was simulated in MATLAB and -87dBm sensitivity, 890KHz bandwidth, with 6.65mW power consumption are obtained. The transmitter was designed as simple as possible, using power oscillator idea, delivering 6mW RF power to the antenna. The transmitter has 25% power efficiency, very good result in comparison with the reported works.
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Submitted on : Friday, January 8, 2010 - 10:43:41 AM
Last modification on : Friday, November 6, 2020 - 4:05:49 AM
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  • HAL Id : tel-00445302, version 1

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Javad Yavand Hasani. Design of a Radiofrequency Front-End module for “Smart Dust” sensor network. Condensed Matter [cond-mat]. Université Joseph-Fourier - Grenoble I, 2008. English. ⟨tel-00445302⟩

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