2.5 dB NF 3.1–10.6 GHz CMOS UWB LNA with small group-delay variation
A 3.1–10.6 GHz ultra-wideband low-noise amplifier (UWB LNA) with excellent phase linearity property (group-delay variation is only ±16.7 ps across the whole band) using standard 0.13 µm CMOS technology is reported. To achieve high and flat gain and small group-delay variation at the same time, the inductive peaking technique is adopted in the output stage for bandwidth enhancement. The UWB LNA achieved input return loss (S11) of −17.5 to −33.6 dB, output return loss (S22) of −14.4 to −16.3 dB, flat forward gain (S21) of 7.92±0.23 dB, and reverse isolation (S12) of −25.8 to −41.9 dB over the 3.1–10.6 GHz band of interest. A state-of-the-art noise figure (NF) of 2.5 dB was achieved at 10.5 GHz.
