الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Ultra Wideband (UWB) communications are characterized by transmitting short
duration pulses that occupy a wide frequency range with low power consumption. The wide band is attractive for high speed and short distance communications. On the other hand the low power consumption attracts low speed and long distance applications such as Wireless Sensor Networks (WSN) and Radio Frequency Identification (RFID). The use of noncoherent signaling simplify the design of the UWB communication system and offers additional energy saving.
This dissertation presents two transmitter designs for IR-UWB communication system. The first design utilizes Step Recovery Diodes (SRD) which is characterized by its fast recovery time to generate Gaussian pulses. A pulse shaping filter is used to transform the pulse to a Gaussian higher order derivative. The generated pulse has peak-to-peak amplitude of 27 mV and duration of 1.1 nsec. The PSD of the generated pulse is -45.8 dBm and a band width of 1.5 GHz. The second transmitter is designed using 130nm CMOS technology provided by TSMC. The design and post-layout simulation are preformed using Cadence virtuous tools. A NOR gate along with delay cells are used to generate a Gaussian pulse which is then transformed to a Gaussian 5th derivative pulse using a 3rd order Butterworth filter. The generated pulse has a bandwidth of 6.1 GHz and maximum PSD of -45.2dBm at 5.35 GHz. the pulse has duration of 740 psec and peak-to-peak amplitude of 387 mV. All pulses comply with the FCC and IEEE requirements for UWB communication systems.