Abstract
This paper demonstrates a low-power demodulator for 3-5 GHz non-coherent Impulse-Radio Ultra-Wideband (IR-UWB) receivers for Pulse Position Modulation (PPM) in a low-cost 180 nm CMOS technology capable of processing data rates of up to 15.6 Mbit/s. It consists of a squaring circuit with a dc regulated output and a sampling stage including a comparator. The dc regulated output allows the comparison of the output with an adjustable threshold voltage, and thus taking factors like the comparator offset, noise and the required sensitivity into account. The squaring operation being the key element in typical IR-UWB receivers is performed utilizing the non-linear transfer function of a MOS transistor.
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