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A low-power impulse-radio ultra-wideband (IR-UWB) receiver in 0.18 µm CMOS with a carrier frequency of 4.5 GHz and a bit rate of 4 Mb/s is presented. The receiver is based on a super-regenerative architecture that tracks the incoming signal carrier pulse and synchronizes it with an internal pulse quench signal. The energy consumption for this receiver is 0.3 nJ/bit.
A novel circuit for precise phase detection between two signals with the same frequency is presented. It is shown how the non-idealities in conventional phase detectors give rise to nonlinearities in the average voltage vs. phase characteristic. The proposed circuit makes use of a pair of XNOR-type phase detectors, to which signal and quadrature reference clocks are applied. A decision circuit then...
It is shown that Wireless Sensor Networks (WSNs) are capable of deployment in industrial processes which present particularly hostile RF environments. The techniques which have been developed have generic applicability, but in this work they are focused on the monitoring of grain storage. Determination of the environmental conditions in a grain silo is challenged by the dielectric properties of the...
This report presents the DC, pulsed I–V, small signal, and large signal characteristics of Freescale’s 48 V GaN HFET technology. Characterization of large signal performance for a 12.6 mm at 48V drain bias shows 89 W output power with an associated power density of 7.1 W/mm, linear gain of 17.5 dB, and a power-added efficiency (PAE) of 62%. Analysis of channel temperature over drain bias shows that...
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