Gsm Receiver - Nokia RM-497 Service Manual

RM-497
System Module
The D2800 Juno (BCM21351) embedded RF transceiver subsystem is a quad-band, Class 33 EDGE capable,
implemented in the phone as Class 32. It has a low-IF receiver and a polar transmitter that requires no
transmit filters and uses a standard linear PA. The D2800 Juno has a 26 MHz integral DCXO connected internally
to the RF and PLLs with four buffered 26 MHz clock outputs. The platform only uses one of the 26 MHz clock
outputs, RF_XON.
Basic RF Features
Supported Modulation
Frequency Bands supported
Band configurations
GMSK Power Class
8PSK Power Class
Multislot Class
Static sensitivity level
RF Key Components
Description
Multimedia Baseband and RF ASIC - "Juno"
GSM/EDGE Front-end module (Amplifier + switch)
Dual GSM RX SAW filter for GSM850 and GSM900
Dual GSM RX SAW filter for GSM1800 and GSM1900
26 RF MHz Crystal (8 pF)

GSM Receiver

The D2800 Juno BB/RF ASIC contains four low noise amplifiers (LNA), one for each band. The receiver uses a
low-IF architecture, meaning the incoming RF signal to the mixer is quadrature-down-converted to the IF
frequency.
Issue 1 COMPANY CONFIDENTIAL
Copyright © 2010 Nokia. All rights reserved.
GMSK and 8PSK
GSM850: ARFCN 128-251
- TX: 824.00-849.00 MHz
- RX: 869.00-894.00 MHz
EGSM900: ARFCN 975-1023, 1-124
- TX: 880.00-915.00 MHz
- RX: 925.00-950.00 MHz
GSM1800 (DCS): ARFCN 512-885
- TX: 1710.00 – 1785.00 MHz
- RX: 1805.00 -- 1880.00 MHz
GSM1900 (PCS): ARFCN 512-810
- TX: 1850.00 – 1910 MHz
- RX: 1930.00 – 1990 MHz
Quad-band
Class 4 (GSM850 and GSM900)
Class 1 (GSM1800 and GSM1900)
Class E2 (All bands)
MSC 32
-108 dBm typical (All bands)
Reference
D2800
N7500
Z7500
Z7501
B2800
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