A fully-integrated 2.4/5.7 GHz concurrent dual-band 0.18 mu m CMOS LNA for an 802.11 WLAN direct conversion receiver

Abstract

This article describes a 2.4/5.7 GHz concurrent dual-band CMOS LNA for 802.11 WLAN direct conversion receiver (DCR) applications using 0.18 μm technology. A fully-integrated dual-band LNA was designed, which simultaneously provides narrow-band gain and matching at 2.4 and 5.7 GHz bands. The basic circuit topology is a cascode amplifier with a large number of on-chip passive networks to satisfy the dual-band LNA specification. The circuit measurement was performed using an on-wafer test set-up. At 2.44 GHz the LNA exhibits a noise figure of 5.66 dB, a linear gain of 7.61 dB, a P1dB = -9.3 dBm and an IIP3 = -1.5 dBm; the LNA at 5.76 GHz features a noise figure of 6.8 dB, a linear gain of 8.58 dB, a P1dB of -10 dBm and an IIP3 = -2.4 dBm. The power consumption of the concurrent dual-band LNA is 10.8 mW at V D D = 1.8 V.