A 3.2 mW 2.2-13.2 GHz CMOS Differential Common-Gate LNA for Ultra-Wideband Receivers

This paper presents a low power consumption CMOS differential common-gate low noise amplifier (CG LNA) for ultra-wideband (UWB) applications. A capacitor cross-coupled (CCC) transconductance (
$G_{m}$
) boosting technique is adopted to improve the noise figure (NF) and lower power consumption. Moreover, an active positive current feedback scheme is employed to further reduce NF and boost input matching bandwidth. Implemented in a 65nm CMOS process, the LNA achieves a peak gain of 16.3 dB over a 3-dB bandwidth of 0.8-13.2 GHz and a minimum NF of 3.3 dB. The measured input-referred third-order intercept point (
$IIP_{3}$
) is −5.3 dBm at 6 GHz. At a supply voltage of 1 V, the LNA core consumes approximately 3.2 mA of DC current. To the best of authors' knowledge, this paper presents the best figure-of-merit (F.O.M) compared to prior works on UWB LNAs.