Pulse generator design for UWB IR communication systems

This paper presents a low power impulse generator design for ultra-wideband (UWB) impulse radio (IR) applications. Simple digital delay elements and a NAND gate are used to generate short duration pulses. A varactor controls the pulse width of the generated signal. The low-end of the spectrum of the generated pulse is attenuated using an integrated high-pass filter while the high-end of the spectrum is extended using a peaking inductor. This makes efficient use of the FCC spectral mask. The designed pulse generator in 0.18 /spl mu/m TSMC CMOS technology consumes 0.4 mW at 100 MHz pulse repetition rate, and the spectral efficiency is more than 55%. The proposed IR generator topology gives a spectral efficiency improvement of more than 14% relative to the topology without the peaking inductor.

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