5.7 GHz 0.18 μm CMOS gain-controlled LNA and mixer for 802.11a WLAN applications

Abstract

A 5.7 GHz 0.18 /spl mu/m CMOS gain-controlled differential LNA and a single-ended CMOS mixer for 802.11a WLAN applications are presented. The differential LNA, fabricated with the 0.18 /spl mu/m 1P6M standard CMOS process, uses a current-reuse technology to increase linear gain and save power consumption. The single-ended CMOS mixer uses a single balance topology. Measurements of the CMOS components are performed by using a FR-4 PCB test fixture. The LNA exhibit noise figure of 3.7 dB, linear gain of 12.5 dB, P/sub 1dB/ of -11dBm, and gain tuning range of 6.9 dB. The mixer with a 280 MHz IF has a conversion gain -4.5 dB, input P/sub 1dB/ 0 dBm, and noise figure 14.6 dB. LO-RF isolation is 20 dB and LO-IF isolation is 24 dB. The power consumption of the differential LNA is 14.4 mW and that of the mixer is 10.4 mW from a 1.8 V power supply.