Design of pulse synthesizers for the convergence of IR-UWB solutions

Abstract

This paper presents some techniques to synthesize pulses in the context of IR-UWB. Pulse synthesizers are good candidates when different kinds of pulses are needed to comply with different standards or when the shape of the pulses needs to be modified. Two different approaches are described here. Voltage Controlled Delay Line (VCDL) based pulsers are first described. For this family, two kinds of combiners are presented : differential pairs based and H-bridge based. The second one achieves a larger output dynamic but is limited by the use of the VCDL. A second type of H-bridge based synthesizer using VCO is presented. Using both a VCO and a H-Bridge offers the largest synthesis capabilities. It allows large voltage pulses to be synthesized and the pulse duration is not limited. All proposed architectures has been implemented and their measured performances are given for comparison.

Design of a multi-standard IR-UWB emitter in a 28 nm FD-SOI technology based on the frequency transposition pulse synthesis

“…Published IR-UWB emitters compliant with IEEE standards are mainly based on two pulse synthesis method : the direct pulse synthesis and the frequency transposition pulse synthesis. Considering the direct pulse synthesis technique, the pulse is directly generated within the frequency band of interest using an architecture based on delay lines [7,9]. However, in literature, UWB transmitters based on delay lines seem to be able to generate pulses with a central frequency span no more than 4 GHz, which is not enough to cover all the 3.1 GHz -10.6 GHz [8], but achieve very high sidelobes rejection.…”