A 2.4∼6GHz CMOS broadband high-gain differential LNA for UWB and WLAN receiver

A 2.4-6 GHz broadband CMOS differential LNA for WLAN and UWB receiver is presented. The LNA is fabricated with the 0.18 mu m 1P6M standard CMOS process. Measurement of the chip is performed on a FR-4 PCB test fixture. In the UWB low-band (3 to 5.15GRz), the broadband LNA exhibit a gain of 17.5-18.2 dB, noise figure of 3.4-5dB, input/output return loss better than 10 dB, and input P-1dB of -17 dBm, respectively. In the band from 2.4 to 3GHz (covering a 802.11b/g band), the LNA exhibit a gain of 17.5-18dB and noise figure less than 3.5dB. From 5.2 to 6GHz, the noise figure of the LNA becomes higher than 5 dB. The gain also decrease to about 15 dB. The DC supply is 1.8V.