A 140 GHz, 4 dB Noise-Figure Low-Noise Amplifier Design with the Compensation of Parasitic Capacitance CGS

This paper presents a 140 GHz differential low- noise amplifier (LNA) design for millimeter-wave application. A new input matching method based on the 3-coil transformer is proposed to minimize the noise figure. Based on the input matching network, the input signal is transferred to the sources and gates of the MOSFETs through a cross-coupled structure which compensates the loss due to the parasitic capacitance C
_GS
. The capacitor neutralization technique and the current reuse technique are combined to reduce the power consumption while keeping the high gain. The LNA is demonstrated using 28nm CMOS process. According to the post-layout simulations, a maximum gain of 21 dB and a minimum noise figure of 4 dB are achieved. The simulated 3-dB bandwidth is 11 GHz, and the power consumption is 10 mW with 1 V power supply.