Novel Ku/K-Band low-power LNAs with simultaneous input impedance and noise matching

In this article, three novel low-power and voltage Ku/K-band low noise amplifiers (LNAs) are proposed and designed. These three LNAs have an identical structure. The excellent simultaneous noise and input impedance matching are prevailed by employing a high-pass filter in front of the input port. This high-pass filter has two resonance frequencies under RLC load addressing simultaneous noise and input impedance matching. A capacitive shunt-shunt feedback and the inductive source degeneration as well as the common-source amplifier are applied to design the filter. The proposed LNAs consist of two stages and each stage takes advantage of the current-reused configuration. By shunt and series peaking technique, broadband, high and flat gains are achieved. The first, second, and third LNAs are adapted for functioning in Ku-band (12-18 GHz), K-band (18-26.5 GHz), and Ku/K-band (11-28 GHz), respectively. Because of excellent power linearity and low-power design, a low supply voltage of 1.2 V is chosen for LNAs by Volterra series analysis. The proposed LNAs have S-11 and S-22 parameters lower than - 10 dB, noise figures better than 2.5 dB, and S-21 parameters greater than 9 dB. The power consumption of the first, second and third LNA are only 8.2, 13.8, and 11 mW; respectively. The excellent IIP3 of the Ku/K-band LNA is - 5 dBm. By applying group delay analysis, perfect group delay variations of the LNAs are better than +/- 15 ps.