A sub-2 dB noise-figure 2.4 GHz LNA employing complementary current reuse and transformer coupling

A complementary current-reuse inductive source-degeneration common-source low noise amplifier (LNA) is presented for low-power and low noise-figure (NF) applications. A transformer-coupling technique is employed to improve the current efficiency and minimize the chip area. The LNA operates at 2.4 GHz and consumes 3 mW from a 1.2-V supply voltage, with a power gain of 13 dB, a NF of 1.8 dB, and an IIP3 of -8.9 dBm. A prototype device is designed and fabricated in 90-nm CMOS technology with a chip area of 1.0 × 0.75 mm².