摘要
This paper proposes a broadband, high gain, low power cryogenic noise-canceling (NC) low-noise amplifier (LNA) in 40-nm CMOS for quantum computing applications. A CG-CS noise-canceling topology with an active feedforward Gm- boosting stage is used for gain enhancement without adding extra noise in the main stage, and a novel current bleeding (CBLD) amplifier is employed to provide the required DC current for enhancing the auxiliary amplifier transconductance. A forward-body bias (FBB) is incorporated at the input stage to counter the fluctuations in Vth and output resistance under cryogenic temperature. At room temperature (RT), the proposed LNA achieves a measured gain ( S 21,max) of 36.8 dB with a minimum noise figure of 3.6 dB at 0.8 GHz. At 12 K, it shows a measured gain ( S 21,max) of 37.6 dB with a minimum noise figure of 1.38 dB at 0.9 GHz within a 3-dB bandwidth of 60 MHz - 1.62 GHz while it consumes 8.2 mW from a 1-V supply. The circuit only occupies an active area of 0.1 mm.