Power Supply Rf-Part - Siemens S55 Repair Documentation

4.1 Power Supply RF-Part

The voltage regulator for the RF-part is located inside the
5.2).It generates the required 2,8V "RF-Voltages" named
The voltage regulator is activated as well as deactivated via
and VCXOEN_UC
(Miscellaneous R6)
deactivation is used to extend the stand by time.
Circuit diagram
Between Power Supply ASIC and RF-Part a resistor based interface consisting of
resistor R841 for VCC2_8
V1.00
S55/S57
provided by the EGOLD+. The temporary
and R843 for VCC_SYN
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Company Confidential © Copyright Siemens AG
ASIC D361.(see chapter
VCC2_8 and
SLEEPQ
(TDMA-Timer H16)
VCC2_8
VCC_SYN
is used .
ICM MP CCQ GRM
VCC_SYN .
12/02