A novel configuration for UWB LNA suitable for low-power and low-voltage applications

Two UWB LNAs based on a new configuration suitable for low-power and low-voltage applications are presented. The proposed configuration saves bias circuit because of sharing only a bias circuit. In designing LNA-1 good phase linearity property achievement is followed for low-power and low-voltage applications, while in LNA-2 the main concerns are high power gain, by keeping low-power consumption, and small chip area. By taking advantages of resistive-feedback and RLC load, wideband input matching is obtained. Based on the proposed configuration, accompany with complete noise analysis, noise of LNA-2 is highly suppressed and flat noise figure is reaped. The 130 nm CMOS LNA-1 and LNA-2 dissipate 2.95 mW and 6.09 mW, respectively, from 0.7 V supply voltage, without using of forward-body-bias technology. Input return loss of both LNAs is below than 10.5 dB while LNA-1 achieves average power gain of 9 dB and LNA-2 17 dB. The group-delay variation of LNA-1 is about 76.1 ps over the band of 3.1–10.6 GHz. The NF of LNA-2 is 2.4–2.89 dB over the whole band of interest. & 2012 Elsevier Ltd. All rights reserved.