Company Confidential
s
Com
Copyright 2005© Siemens AG
Page
12
of
53
TD_Repair_L2.5_A70_A75_R1.0.pdf Release
1.0
Bright 6E
VCXO Out
EGOLD In
To compensate frequency drifts (e.g. caused by temperature) the oscillator frequency is
controlled by the (
RF_AFC
) signal, generated through the internal EGOLDlite (
D171
(A10)
)
PLL. Reference for the “EGOLD-PLL” is the base station frequency received via the
Frequency Correction Burst.
The required voltage
VDD_RF2
is provided by the ASCI
D361
Waveform of the AFC_PNM signal from EGOLDlite to Oscillator
E G O L D +
G N D
G N D
R 2
R F _ A F C
S ig n a lfo r m
C1
C2
A F C _ P N M
G N D
C3
R 3
1 2
3
1
2
3
R 1
