MGA-72543

MGA-72543 PHEMT* Low Noise Amplifier with Bypass Switch Data Sheet Description Avago’s MGA-72543 is an economical, easy-to-use GaAs MMIC Low Noise Amplifier (LNA),which is designed for an adaptive CDMA receiver LNA and adaptive CDMA transmit driver amplifier. The MGA-72543 features a minimum noise figure of 1.4 dB and 14 dB associated gain from a single stage, feedback FET amplifier. The output is internally matched to 50Ω. The input is optimally internally matched for lowest noise figure into 50Ω. The input may be additionally externally matched for low VSWR through the addition of a single series inductor. When set into the bypass mode,both input and output are internally matched to 50Ω. The MGA-72543 offers an integrated solution of LNA with adjustable IIP3. The IIP3 can be fixed to a desired current level for the receiver’s linearity requirements. The LNA has a bypass switch function,which sets the current to zero and provides low insertion loss. The bypass mode also boosts dynamic range when high level signal is being received. For the CDMA driver amplifier applications, the MGA72543 provides suitable gain and linearity to meet the ACPR requirements when the handset transmits the highest power. When transmitting lower power, the MGA72543 can be bypassed, saving the drawing current. The MGA-72543 is a GaAs MMIC, processed on Avago’s cost effective PHEMT (Pseudomorphic High Electron Mobility Transistor). It is housed in the SOT343 (SC70 4-lead) package, and is part of the...