Dual cross-coupling LNA with forward body bias technique

Abstract

A fully integrated low-power LNA with dual cross-coupling and forward body bias (FBB) techniques is presented. The first cross-coupling circuit is applied at the transconductance stage. By connecting body nodes to each other's source terminals, the body cross-coupling network forms the gate-driven and body-driven simultaneously input stage to gain its effective transconductance, which in turn improves the noise performance and decreases current consumption. In addition, the second capacitor cross-coupling configuration is applied at the input stage to form a feed-forward connection, which results in not only boosting the effective transconductance, but also reducing the influence of the gate noise from the input transistors as well. Moreover, to decrease the overall power consumption further, the FBB technique is employed to lower the supply voltage. The measured noise figure is lower than 3.38 dB and the core circuit consumes only 2.16 mW.