Abstract-A study of the component tolerances on an ultra-wideband (UWB) low-noise amplifier designed on a conventional printed circuit board is presented in this paper. The low-noise amplifier design employs dual-section input and output microstrip matching networks for wideband operation with a low noise figure and a flat power gain. First, the effect of passive component and manufacturing process tolerances on the low-noise amplifier performance is theoretically studied by means of sensitivity analyses. Second, simulation and measurement results are presented for verification of the analytical results. It is shown that, compared with a lumped matching network design, a microstrip matching network design significantly reduces the UWB low-noise amplifier sensitivity to component tolerances.Index Terms-Low-noise amplifier (LNA), matching networks, sensitivity analysis, ultra-wideband (UWB).
This article has presented the design of an integrated RF receiver front end for 28.5 GHz applications on a 0.25 lm SiGe process from top level specifications down to the circuit level and chip design and experimental measurements. System calculations and simulations considering additive white noise and phase noise simultaneously were presented to enable the definition of specifications for the building blocks of the receiver. The LNA and quadrature mixer were designed according to the specifications and also the local oscillator. The receiver chip revealed an oscillator running at 24 GHz instead of the design frequency of 28.5 GHz. Accordingly, experimental measurements were taken at 24 GHz; they showed 15 dB conversion gain with À3 dB bandwidth of 90 MHz and a noise figure of 14.5 dB. The values are close to the predicted ones by simulation.
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