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Radio Part; Power Supply For Rf Part - Siemens A35 Repair Documentation

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4. Radio Part

The radio part converts the I/Q base band signals supplied, by the logic (EGOLD+)
into RF-signals with characteristics as per the GSM recommendation
(transmission) which are radiated by the antenna.
Or the radio part converts the received GMSK signal, supplied by the antenna
into I/Q base band signals, which can be further processed by the logic (EGOLD+).
The radio part is designed for Dual Band operation and can therefore serve the
frequency bands EGSM900 and GSM1800. The radio part can never transmit and
receive in both bands simultaneously. However, the monitor time lot can be selected
independently of the frequency band.
Transmitter and receiver are of course never operated simultaneously.
The radio part consists of the following blocks:
Power supply (RF-Voltage regulators)
Synthesizer (partly located in SMARTI)
Receiver (partly located in SMARTI)
Transmitter (Up conversion loop partly located in SMARTI)
Transmitter (Power amplifier)
Antenna Switch
4.1 Power Supply RF-Part
Two voltage regulators (N430/431) with a nominal output voltage of 2.8V are
used, to perform the required "RF-Voltages".
The voltage regulator
N430
EGOLD+ (
TDMA-Timer H12
The voltage regulator
N431
the EGOLD+ (
Functional P7
The name of the voltages are: a)
For both voltages
BATT+
V1.0
A35-A36-A40
is activated via
SLEEPQ_SMARTI
).
is activated via
VCXOEN
).
VCC_SYN
activated by
and b)
VCC2_8
activated by
is required.
Page 6 of 38
Company Confidential
provided by the
provided by
VCXOEN
SLEEPQ_SMARTI
Notes
ICM MP CC ST
09/01

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A36A40

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