A 2-PPM CMOS modulator for IR-UWB signals

Abstract

This paper presents an implementation of a binary pulse-position modulator (2-PPM) for impulse-radio ultra-wideband (IR-UWB) systems, capable of producing an appropriate signal to drive the final output stage of an ultra narrow pulse generator. Compared to the usual circuits based on voltage-controlled delay lines, this novel scheme uses digital signal processing of the clock and data signals with a direct implementation in CMOS technology, which makes possible to construct also the UWB pulse generator. Simulations show that the signal obtained as pulse sequences that are delayed using phase modulation can be used to drive an UWB generator that outputs pulses satisfying the requirements regarding the regulated output spectrum.