An InGaP-GaAsHBT low-noise amplifier for 2.4/5.2/5.7-GHz WLAN applications

[[abstract]]A 2.4/5.2/5.7-GHz triple-band low-noise amplifier (LNA) achieved by switching between different base bias currents (I-B) using InGaP-GaAs HBT technology is reported for the first time. Transducer gains (S-21) of 14.6 and 11/9.5 dB, input return losses (S-11) of - 18.7 and -21.0/-11.5 dB, output return losses (S-22) of -20 and -22.7/-24.9 dB, reverse isolation (S-12) of -50.5 and -44.4/-44.4 dB, and noise figures of 3.35 and 2.54/2.71 dB were achieved at 2.4 and 5.2/5.7 GHz respectively. The input 1-dB compression point (P-1dB) and input 3(rd)-order intercept point (IIP3) of -8.5 and -1 dBin, respectively, were also achieved at 5.2 GHz.. The power consumptions are only 7.6 and 3.6 mW for the 2.4- and 5.2/5.7-GHz bands, respectively. The LNA only occupies an area of 300 X 500 Am, excluding the test pads because only one inductor is used. (C) 2004 Wiley Periodicals, Inc.[[note]]SC