A 3.2 mW 2.35-dB NF Noise-Cancelling Balun-LNA Using Current-Reuse-Enhanced Local-Feedback for Improved Power Efficiency

초록

In this article, a 0.1-1.2 GHz broadband balun low-noise amplifier (LNA) achieving low-power operation and balanced output loads using a current-reuse-enhanced local-feedback architecture is presented. The proposed topology employs a current-reuse inverter-based common-source (CS) stage to increase the effective transconductance without additional DC current, thereby strengthening the loop gain of the local-feedback common-gate (CG) stage and relaxing the intrinsic CG g(m) requirement for wideband input matching. As a result, an improved gain-noise-power trade-off is achieved while maintaining balanced differential output. Fabricated in a 65-nm CMOS process, the proposed balun-LNA achieves a minimum noise figure of 2.35 dB, a maximum voltage gain of 28.9 dB, and S-11 < -10 dB over a 1.2 GHz bandwidth. The measured peak IIP3 and OIP3 are -5.6 dBm and 23.3 dBm, respectively. The LNA consumes 3.2 mA from a 1 V supply and occupies an active area of 0.027 mm(2).

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