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Transmitter: And Power Amplifier - Siemens A55 Repair Documentation

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4.7.2 Transmitter: and Power Amplifier

The output signals
(CS_PA_IN ,
power amplifier (Z1700) passing a matching circuit. contains two separate 3-stage amplifier
chains for GSM 900 and GSM 1800. The control of the output power is handled via one
Vapc port. The power control circuit itself is integrated in the PA module. The
generates the power control signal PA-RAMP. The band selection switching is done via
OSW1
from the Smarti IC.
The required voltage
BATT+
The required voltage
VCC2_8
from limitter
amplfier
Blockdiagram of R 340 (PA)
V 1.10
A52/A55/C55 IFX
and GSM_PA_IN) from the limited amplifier are led to the
is provided by the battery.
for the power control circuit is provided by the ASIC D361.
Page 16of 45
Company Confidential © Copyright Siemens AG
EGOLD
to Ant.
connector
ICM MP CCQ GRM
08/03

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