A High Linearity Wideband Low-Noise Amplifier Using Capacitor Cross-Coupled Common-Gate Structure

A high linearity wideband Low-Noise Amplifier (LNA) that uses Capacitor Cross-Coupled Common-Gate structure is proposed in this paper. The proposed design uses a differential topology with a common-source stage and a Capacitor Cross-Coupled Common-Gate (CCC-CG) amplifier to increase the linearity of the circuit. Moreover, it uses a current reused feed-forward noise cancellation technique. Standard 0.18-μm CMOS technology has been used for designing and simulating the proposed LNA. According to the findings of the circuit-level simulation, the voltage gain and bandwidth of the proposed LNA are 17.68 dB and 3.34 GHz (from 1.59 GHz to 4.93 GHz) respectively. The Noise Figure (NF) of LNAs is one of the most important parameters and the minimum NF of the proposed structure is 3.76 dB. Also, at an input frequency of 4.93 GHz, Third-Order Input Intercept Point (IIP
3
) of the proposed LNA is maximum, which is -1.43 dBm.