This paper presents a hybrid gm boosting technique exploiting both transformer coupling and cross-coupled pair to improve gain and noise figure. To demonstrate the effectiveness of the proposed technique, a high-gain and low-noise mixer for 5G FR2 is developed in 40 nm CMOS. Transformer-based pole splitting and derivative superposition are employed to enhance bandwidth and improve linearity. The mixer achieves a peak CG of 20.9 dB, a 30% fBW, a minimum NF is 7.7 dB, and an IP1dB is -14 dBm. The mixer consumes 15.6 mW of power and occupies an area of 0.31 mm2.