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4 Radio Part
The radio part is designed for Tripple Band operation, covering EGSM900, GSM1800 as
well as GSM 1900 frequencies, and can be divided into 4 Blocks.
o RF power amplifier (RF9340) and PA Buffer/Limiter (Infineon PMB2256)
o Frontend Module (Epcos M002)
o 26 MHZ reference VCO
o Tranceiver (Infineon Smarti DC PMB 6259 for 900/1800/1900)
The functionality of the DC SMARTI are:
- All VCOs and PLLs are build in
- Direct Modulator
- Direct Demodulator
- Including the active part of the reference oscillator.
The RF-Part has it´s own power supply realised by a voltage regulator which is located
inside the ASIC. The voltages for the logic part are generated by the Power-Supply ASIC
too.
The transmitter part converts the I/Q base band signals supplied by the logic (EGOLD+)
into RF-signals with characteristics as defined in the GSM recommendation
(www.etsi.org). After amplification by a power amplifier the signal is radiated via the
internal antenna.
The receiver part converts the received GMSK signal supplied by the antenna into IQ
base band signals which are further processed by the logic (EGOLD+).
The synthesizer generates the required frequencies for the transmitter and receiver. A
26MHz oscillator is acting as a reference frequency.
Restrictions:
The mobile phone can never transmit and receive in both bands simultaneously. Only the
monitor time slot can be selected independently of the frequency band. Transmitter and
receiver can of course never operated simultaneously.
V 1.0
SL55
Page 6of 52
Company Confidential © Copyright Siemens AG
Customer Care
ICM MP CCQ GRM
06/03
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