DESCRIPTION

LX5541 is a co-package RFIC consisting of an InGaP/GaAs Heterojunction Bipolar Transistor (HBT) power amplifier, an InGaAs pseudomorphic HEMT (pHEMT) low noise amplifier, and a SPDT switch. All three RF devices are optimized for WLAN applications in the 2.3 to 2.5 GHz frequency range.

The PA is implemented as a two stage monolithic microwave integrated circuit (MMIC) with active bias and output pre-matching. The LNA is fully matched internally, and the LNA is connected to the RX port of SPDT switch directly inside the MLPQ package.

KEY FEATURES

■ Small Footprint: 3x3mm2

■ Low Profile: 0.45mm

■ 2.3-2.5GHz Operation

■ Single-Polarity 3.3V Supply

■ On-Chip Active Bias Circuit for both PA and LNA

TX Features:

■ Input matched PA

■ Quiescent Current ~ 90mA

■ Power Gain ~ 27 dB *

■ Total Current ~ 145mA for Pout=19 dBm OFDM *

■ EVM~3 % at 19dBm (2% at 17dBm) 54Mbps/64QAM

RX Features:

■ LNA Gain ~ 13 dB *

■ LNA Noise Figure ~ 2 dB *

■ LNA Input IP3 ~ +5dBm *

■ LNA On-Chip Input/Output Match

* Including SPDT switch loss

APPLICATIONS

■ IEEE 802.11b/g/n