Power Amplifier - LG W3000 Service Manual

Gsm phone

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The counter and mode settings of the synthesizer are also programmed via 3-wire interface.

4/3

2/3

DCS

GSM

D. Power Amplifier

The RF3110[U416] is a Dual band amplifier for E-GSM(880 to 915MHz) and DCS1800(1710 to

1785MHz). The efficiency of module is the 50% at nominal output power for E-GSM and the 45%

for DCS1800. This module should be operated under the GSM burst pulse. To avoid permanent

degradation, CW operation should not be applied. To avoid the oscillation at no input power,

before the input is cut off, the control voltage Vapc should be control to less than 0.5V.

We have to improve thermal resistance, the through holes should be layouted as many as

possible on PCB under the module. And to get good stability, all the GND terminals should be

soldered to ground plane of PCB.

CX74017

vco = (N+3.5+FN/2^22)

vco

Fractional-N

Figure 3-3. Synthesizer Block diagram

ref/R

ref

PLL

- 17 -

3. TECHNICAL BRIEF

2V7_VTCXO

13MHz

AFC

REFCLK

Base

Band

Block

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