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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
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3.3.1 Internal Block Diagram
3.3 FEM with integrated Power Amplifier Module (RF7161, U301)
Figure. 3-3-1 RF7161 FUNCTIONAL BLOCK DIAGRAM
3.3.2 General Description
The RF7161 is a quad-band (GSM850/EGSM900/DCS1800/PCS1900) GSM/GPRS, Class 12
compliant transmit module with four interchangeable receive ports. This transmit module
builds upon RFMD’s leading power amplifier with PowerStar® integrated power control technology,
pHEMT switch technology, and integrated transmit filtering for best-in-class harmonic performance. The
results are high performance, reduced solution size, and ease of
implementation. The device is designed for use as the final portion of the transmitter section in
a GSM850/EGSM900/DCS1800/PCS1900 handset and eliminates the need for a PA-toantenna
switch module matching network. The device provides 50 ȳ matched input and output
ports requiring no external matching components.
The RF7161 features RFMD’s latest integrated power-flattening circuit which significantly reduces current
and power variation into load mismatch. Additionally, a VBATT tracking feature is incorporated to
maintain switching performance as supply voltage decreases. The RF7161 also integrates an ESD filter to
provide excellent ESD protection at the antenna port. The RF7161 is designed to provide maximum
efficiency at rated POUT.
3. TECHNICAL BRIEF