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4.1 Power Supply RF-Part
The voltage regulator for the RF-part is located inside the
generates the required 2,85V "RF-Voltages" named
The following components are supplied by:
VREGRF1
· 26 MHz reference oscillator
· VCO
· PLL
The voltage regulator RFREG 1 is controlled by
controlled by SLEEP1_N
signals is high the regulator is enable. SLEEP1_N is connected to the signal
provided by the EGOLD+. RF_EN and SLEEP2_N is connected to
(Miscellaneous R6)
provided by the
ASIC
(REG2 A7)
time.
Circuit diagram
4.2 Frequency generation
4.2.1 Synthesizer: The discrete VCXO (26MHz)
The SL55 mobile phone is using a reference frequency of 26 MHz signal that is created by
a partly integrated VCXO. ON/OFF signal
EGOLD+. A Colpitts-oscillator is used with a post connected buffer stage integrated in the
Smarti. For temperature measurements of the VCXO a temperature resistance (R700) is
used. The resistor is placed near the VCXO. The measurement result
to the
EGOLD+
(Analog Interface P3)
The frequency of the reference oscillator can be adjusted by the
modulated AFC-signal.
The signal leaves the
EGOLD+
(D171
(functional T3))
The required voltage
VREGRF1
V 1.0
SL55
and SLEEP2_N
(on/off Control H1)
The temporary deactivation is used to extend the stand by
(VCXOEN
via R138 as the signal TENV.
SMARTI
as
BB_SIN26M
.
is provided by the ASCI
Page 7of 52
Company Confidential © Copyright Siemens AG
Customer Care
ASIC
D361.(see chapter 5.2).It
VREGRF1
and VREGRF2.
VREGRF2
· Modulators
· RX mixers
· Limiter amplifier
1.8V
(RF_EN
(RF REG G2)
. IF one of these
(on/off Control F1)
VREGRF1
VREGRF2
) comes from the
(Miscellaneous R6)
TVCXO
EGOLD+
at pin 4 to be further used from the
D361
)
RFREG2 is
,
VCXOEN
1.8 V
is reported
via a PNM-
ICM MP CCQ GRM
06/03
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