A 20-GHz differential two-stage low-noise amplifier (LNA) is demonstrated in a foundry digital 130-nm CMOS technology with 8-metal layers. This LNA has 20-dB voltage gain and /spl sim/5.5-dB noise figure at 20GHz with 24-mW power consumption. The measured IP/sub 1 dB/ and IIP/sub 3/ are -11 dBm and -4dBm. Compared to the previously published bulk CMOS LNAs operating above 20GHz, this LNA has exceptionally low power and current consumption especially considering its differential topology and wide bandwidth.
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Guo et al. (2005) studied this question.
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