Customer Care
V 1.0 Page 17of 52 ICM MP CCQ GRM
SL55
Company Confidential © Copyright Siemens AG
06/03
4.5.2 Transmitter: and Power Amplifier
The output signals (CS_PA_IN , and GSM_PA_IN) from the limited amplifier are led to the
power amplifier (Z600) passing a matching circuit. contains two separate 3-stage amplifier
chains for GSM 850/900 and GSM 1800/1900. The control of the output power is handled
via one Vapc port. The power control circuit itself is integrated in the PA module. The
EGOLD generates the power control signal PA-RAMP. The band selection switching is
done via OSW1 from the Smarti IC.
The required voltage BATT+ is provided by the battery.
The required voltage VREGRF2 for the power control circuit is provided by the ASIC D361.
Blockdiagram of R 340 (PA)
to Ant.
connector
from limitter
amplfier
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