Fem With Integrated Power Amplifier Module - LG -T510 Service Manual

3. TECHNICAL BRIEF
3.3 FEM with integrated Power Amplifier Module (RF7171, U101)
3.3.1 Internal Block Diagram
Figure. 3-3-1 RF7171 FUNCTIONAL BLOCK DIAGRAM
3.3.2 General Description
The RF7171 is a quad-band (GSM850/EGSM900/DCS1800/PCS1900) GSM/GPRS, Class 12 compliant transmit
module with two interchangeable receive ports. This transmit module builds upon RFMD's power amplifier
with PowerStar® integrated power control technology, pHEMT switch technology, and integrated transmit
filtering for best-in-class harmonic performance.
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-to-antenna switch module
matching network.
The RF7171 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 RF7171 also integrates an ESD filter to provide ESD protection at the antenna port.
The RF7171 is designed to provide maximum efficiency at rated Pout.
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