K630 - V640 - K660
1215-3608 rev. 1
FUNCTIONAL OVERVIEW
FU
N
C
T
IO
N
A
L O
V
E
R
V
IE
W
RF System Control
The access subsystem of the digital baseband controller controls the overall radio system. In
both EDGE/GSM/GPRS and WCDMA air interface mode, the digital baseband controller controls
the radio system through a 3-wire serial bus.
The digital baseband controller also manages PA band control and the antenna switch
mechanism in the front end module. The 26 MHz VCXO clock residing in the GSM/EDGE
transceiver is turned on only when required. The digital baseband controller initiates turning on
of the clock. The EDGE/GSM/GPRS RF system requires control, which is temperature dependent.
The temperature within the RF system is estimated by a voltage measurement performed by
the analog baseband controller N2000 (Vera).
The control flow for the RF system.
Radio Part
Antenna
The mobile system antenna interface connects the Wideband Code Division Multiple
Access (WCDMA) and Global System for Mobile Communication (GSM) input/output to
the antenna of the Mobile Phone. It is a bi-directional RF interface containing signals in the
range 800 MHz to 2.2 GHz. The mobile system antenna interface is the interface between the
Mobile Phone Radio Frequency (RF) input/output and the mobile system antenna. The interface
handles the GSM 850, EGSM 900, GSM 1800, GSM 1900 and WCDMA Band I, RF inputs/outputs.
Mobile System Antenna Interface:
Radio Modules
GSM/GPRS/EDGE Radio Module
N1200 (Thor)
The GSM/GPRS/EDGE transceiver use a digital interface that is shared between receive
and transmit data. The receive interface is based on I and Q data and the transmitter
interface is based on envelope and frequency data. The quad band GSM/GPRS/EDGE
transceiver has the following general features:
The GSM/EDGE transceiver has the following features:
• Individual low-noise amplifiers for the 850, 900, 1800 and 1900 MHz frequency bands
with a common quadrature mixer
• Fully integrated VCO with dividers to generate both receive and transmit frequencies
• I and Q baseband receive channel amplifiers with on-chip antialiasing filtering
• I and Q receiver sigma-delta A to D converters
• Digital interface for the receive I and Q channel
• Multi modulus prescaler for direct VCO modulation in transmit mode
• Integrated phase detector with programmable charge pump
• Transmit output buffer with controllable output power level
• Transmit baluns integrated
• Digital interface for the transmit frequency and amplitude modulation
• 3-wire serial bus interface for control, configuration, and test
• Deep power down function
• Programmable power level to power amplifier (PA)
Block diagram of the GSM/EDGE Transceiver
Technical Description
SEMC Troubleshooting Manual
71
(96)