A 30–50-GHz Ultralow-Power Low-Noise Amplifier With Second-Stage Current-Reuse for Radio Astronomical Receivers in 90-nm CMOS Process

A Q-band (30–50 GHz) ultralow-power low-noise amplifier (LNA) for radio astronomical receivers in 90-nm CMOS technology is presented in this letter. A common source stage with source degeneration is utilized for simultaneous noise and impedance matching. To achieve high gain and low power consumption, the current-reused technique is adopted in this work. According to measurement, the proposed Q-band LNA achieves a 20.5-dB small signal gain with 26-GHz 3-dB bandwidth (25.5–51.5 GHz) and the lowest in-band noise figure (NF) of 4.2-dB noise. The LNA consumes only 10.1 mW with a compact chip area of
$0.6\times $
1 mm2. Although this LNA is fabricated in 90-nm CMOS process, it achieves the state-of-the-art figure of merit (FOM) compared to other advanced CMOS processes.