A Tri-Band Two-Stage LNA With Simultaneous Linearity and Gain Enhancement for WiFi
A Tri-Band Two-Stage LNA With Simultaneous Linearity and Gain Enhancement for WiFi
Abstract:
This brief presents a tri-band, two-stage compact low-noise amplifier (LNA) that simultaneously enhances linearity, gain, and noise performance for WiFi applications. The second stage adopts a dual-path architecture, consisting of a main amplifier and an additional amplifier. The additional amplifier, biased in the subthreshold region, suppresses third-order nonlinearity and enhances gain without increasing power consumption. The first-stage LNA reduces the noise contribution from the second stage, improving overall noise performance. To further minimize power consumption, an inverter-based topology is employed. Fabricated in a 90-nm CMOS process, the proposed LNA achieves an S11 below −5 dB at 2.4, 5, and 6 GHz, covering key WiFi bands. At 6-GHz band, it delivers 13.5-dB gain, 3.2-dBm third-order input intercept point (IIP3), and 3.1-dB noise figure (NF). At 5-GHz band, it achieves 15-dB gain, 0.7-dBm IIP3, and 2.76-dB NF. At 2.4-GHz band, it provides 20.66-dB gain, −7-dBm IIP3, and 2.7-dB NF. The circuit consumes only 3 mW of dc power. Measurements at 6 GHz show that the dual-path technique in the second stage improves IIP3 by 8.6 dB, increases gain by 1.5 dB, and reduces NF by 0.6 dB, all without additional power or area overhead.
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A Tri-Band Two-Stage LNA With Simultaneous Linearity and Gain Enhancement for WiFi
