A 3-6 GHz Wideband LNA with RF Input Body Biasing and Body Feedback Techniques for Noise Figure, IIP3, and Output Return Loss Enhancement

In this paper, a wideband CMOS LNA with integrated body biasing technique using the RF input signal for noise figures and IIP3 enhancement is presented. The LNA also utilizes a bulk feedback method that minimizes the parasitic capacitances and improves the output return loss (S22) in post-layout design. . The LNA is employed in 2-stages. A cascoded structure is utilized at the 1
^st
stage, while the 2
^nd
-stage uses a common source configuration. The LNA is designed in CMOS 130 nm 6 metal layers technology and the operating bandwidth achieved by the LNA is from 3 to 6 GHz. In post-layout, The NF achieved is 4.2 to 4.0 across the frequency. The LNA consumes a maximum DC output power of 5.7 mW in post-layout. The body feedback at the output and the inter-stage matching network reduced the parasitic capacitance effects and enhanced the LNA's small-signal performance in post-layout by keeping the S11 and S22 below -10 dB across the intended operating frequency.