A 3~10GHz High Gain Low Noise Amplifier With Transformer Feedback Technique

In this paper, an Ultra-Wideband (UWB) low noise amplifier (LNA) is designed. Transformer feedback technique is used to achieve good input matching in a wide bandwidth range. As for high gain in wideband, the cascode structure is cascaded in the second stage to increase the gain, and the inductive peaking technique is adopted in both loads of the first and second stage to optimize bandwidth and gain. Based on the SMIC 130 nm process, the simulation results show that the input matching S
11
and output matching S
22
of the designed UWB LNA are less than −10 dB from 3 GHz to 10 GHz, power gain S
21
is 20.05±0.75 dB; the noise figure is
$2.22\sim 3.51$
dB, and the input third-order intercept point is −18.75 dBm. When the power supply voltage is 1V, the overall power consumption of the LNA is 13 mW (without buffer).