University of Twente Student Theses


Design of a fully integrated RF transceiver using noise modulation

Mahrof, Dlovan Hoshiar (2008) Design of a fully integrated RF transceiver using noise modulation.

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Abstract:The aim of this project is to build the radio for sensor networks in low throughput applications. Robust communication and low power consumption are the main challenges in building such networks. Wideband modulation provides this robustness by spreading the spectrum of an information signal over a wide frequency spectrum using a broadband reference signal. Broadband spreading is hampered by long acquisition times, because synchronization takes place under very low SNR conditions. By sending the reference signal with the information signal, this problem is resolved. Since the reference signal does not have to be regenerated at the receiver, pure noise can be used. Noise Modulation techniques do not require coordination between the transmitter and the receiver. At the receiver just a correlation is needed between the received information signal and the received reference signal to reconstruct the information data. This attractive property of the Noise Modulation concept may allow building really low power receivers with a current consumption of less than 100 μA, compatible with energy harvesting (no batteries). In this thesis, a brief description of the Noise Modulation in both the frequency as well as in the time domain is presented. Especially the time analysis appears useful to make various design choices on the system level like the choice of frequencies, type of multiplier and type of baseband filtering. After that the focus is moved to the low power receiver in CMOS, with focus on the design of the correlater. Since the noise contribution of this correlater is very large, because it depends on the square value of its input signal, the receiver will consume high current if a long distance radio-link is needed. Therefore we had to review important parameters in our system, namely the transmitted power, the radio range, the overdrive voltage of the correlater transistors and the current consumption of the Front End, to make some rough decisions in order to meet the goal of designing a low power receiver.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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