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A two-stage ultra-wideband CMOS low noise amplifier (LNA) is proposed. The first stage is optimised for wideband input matching and low noise figure, while the second stage is optimised to extend the -3 dB bandwidth of the overall amplifier. The combination of stages can provide lower noise figure and wider bandwidth simultaneously over that of previously reported feedback-based CMOS amplifiers. The implemented LNA shows a peak gain of 13.5 dB, more than 8.5 dB of input return loss, and a noise figure of 2.5-7.4 dB over a -3 dB bandwidth from 2 to 9 GHz with DC power consumption of 25.2 mW.
Date of Publication: 31 March 2005