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A 1-5 GHz ultra-wideband CMOS low-noise amplifier (LNA) is presented. A common-gate topology is adopted for the input stage to achieve wideband input matching, while a cascode stage is used as the second stage to provide power gain at high frequencies. By using two inductors in the LNA, a small chip area is obtained. The LNA has been fabricated in a standard 0.18 μm CMOS technology. The measured maximum...
A measurement method for characterizing the substrate noise over the ultra-wideband (UWB) frequency band in UWB systems implemented using lightly doped CMOS processes is presented. The measurement structure in this method is based on modified ground-signal-ground (GSG) pads. In addition, the effects of the distance-based substrate resistance and the capacitive coupling between the substrate and the...
This paper describes the design and implementation of a fully differential RF front-end chipset for a low data rate FM-UWB based P-PAN receiver. The chipset includes an ultra-wideband LNA and a wideband RF demodulator. A 0.18 mum standard CMOS RF process is chosen as the technology vehicle. Measurement and demodulation function verification are presented in the paper. The measurement results show...
In this paper a fully differential implementation of a delay-line RF demodulator for FM-UWB based P-PAN receivers is presented and discussed. The implementation makes use of a dedicated circuit to remove possible phase imbalance in the differential signal pair. Without this correction demodulation performance is seriously affected. Detailed transistor-level simulation results are presented based on...
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