Fem With Integrated Power Amplifier Module; (Rf7161, U401) - LG -T315i Service Manual

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3.3 FEM with integrated Power Amplifier Module

3.3.1 Internal 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-to antenna switch module matching network.

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.

LGE Internal Use Only

Figure. 3-3-1 RF7161 FUNCTIONAL BLOCK DIAGRAM

3. TECHNICAL BRIEF

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3. TECHNICAL BRIEF

Only for training and service purposes

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