A Fully Differential Digital CMOS UWB Pulse Generator

Abstract

A new fully digital CMOS pulse generator for impulse radio ultrawideband (UWB) systems is presented. First, the shape of the pulse which best fits the FCC regulation in the 3.1-5 GHz sub-band of the entire 3.1-10.6 GHz UWB bandwidth is derived and approximated using rectangular digital pulses. In particular, the number and the width of pulses that approximate an ideal template are found through an ad hoc optimization methodology. Then a fully differential digital CMOS circuit that synthesizes the pulse sequence is conceived and its functionality demonstrated through post-layout simulations. The results show a very good agreement with the FCC requirements and a low power consumption.

Design challenges of an UWB system for breast cancer detection

“…Our architecture works in time-domain, with UWB pulses generated with special transmitters [3] [4], and with receivers based on the Coherent Equivalent-Time Sampling (CETS) approach [5] [6]. To evaluate the impact on imaging performance (i.e.…”

Simulation and design of an UWB imaging system for breast cancer detection

“…Hence, depending on the operating principle, two common radar approaches, impulse radar and Stepped Frequency Continuous Wave (SFCW) radar, are explored. Impulse radar is a time domain operation, which transmits a single narrow pulse (less than a few nano-seconds), associated with a wide spectrum of signals [42] [43]. The time delayed received waveform is then sampled, which, in general, imposes severe constrains on the Analog-to-Digital conversion process.…”

All digital delay-line based ultra wide band transmitter architecture in 0.18μm CMOS

“…In delay line pulse generator method, the edges of shifted step signals are combined in an edge combining circuit that comprises of an array of XOR and OR gates [3]. Different techniques like Pseudo NOR [4] [5], wired OR and pullup-pulldown [6] method exist for edge combining.…”