一款应用于 802.11ax 的 5.3~7.4 GHz CMOS 低噪声放大器设计

To fulfill the requirements for low noise and wide bandwidth in IEEE 802.11ax applications，a wideband low noise amplifier（LNA）operating at 5.3-7.4 GHz was designed. By utilizing a passive transformer for noise cancellation，the noise figure is improved by 0.27 dB compared to non-cancellation designs，without increasing power consumption. The device incorporated a switched capacitor array for a tunable inter-stage network，providing 700 MHz sub-band and 2.1 GHz overall tuning bandwidths. Additionally，a wideband output matching network was designed based on the constant-Q circle strategy. Fabricated in 22 nm CMOS process，the chip testing results demonstrate a 3 dB bandwidth of 2.1 GHz and a peak gain of 26.5 dB. Furthermore，the noise figure remains below 2.53 dB，and the gain exceeds 23 dB across the entire 5.3 to 7.4 GHz spectrum，with a power consumption of 43 mW.