07-rae6-RF.pdf

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Nokia Customer Care
7 - RF Description and
Troubleshooting
Issue 1 12/04
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
RAE-6/RA-4
Nokia Customer Care
[This page intentionally blank]
Issue 1 12/04
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
2
RAE-6/RA-4
7 - RF Description and Troubleshooting
Nokia Customer Care
Table of Contents
Page No
CMT RF................................................................................................................. 5
Top-level description.......................................................................................... 5
RAE-6 test point locations................................................................................. 6
Test points ......................................................................................................... 7
RF implementation in RAE-6/RA-4 .................................................................. 11
Frequency plan .............................................................................................. 11
RF block diagram ........................................................................................... 12
Antenna switch module (ASM) ....................................................................... 13
DC characteristics .......................................................................................... 13
RF characteristics ............................................................................................ 16
Channel numbers and frequencies ................................................................ 16
RF Troubleshooting .......................................................................................... 17
Receiver description and troubleshooting ........................................................ 17
Rx front end ................................................................................................... 17
Antenna ......................................................................................................... 17
Receiver characteristics ................................................................................. 18
General instructions for Rx troubleshooting ................................................... 19
Transmitter description and troubleshooting .................................................... 27
Power amplifier .............................................................................................. 27
RF ASIC Honi ................................................................................................ 27
AFC function .................................................................................................. 28
Transmitter characteristics ............................................................................. 28
General instructions for Tx troubleshooting ................................................... 28
Additional information for EDGE troubleshooting ............................................ 35
Pictures of EDGE transmitter signals ............................................................. 39
Synthesizer description and troubleshooting ................................................... 43
Frequency synthesizers ................................................................................. 43
General instructions for synthesizer troubleshooting ..................................... 43
Frequency Lists .............................................................................................. 48
RF tunings after repairs ................................................................................... 52
Issue 1 12/04
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
3
RAE-6/RA-4
Nokia Customer Care
7 - RF Description and Troubleshooting
[This page intentionally blank]
4
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Issue 1 12/04
RAE-6/RA-4
7 - RF Description and Troubleshooting
Nokia Customer Care
CMT RF
■
Top-level description
The RF module performs the necessary high frequency operations of the GSM850/EGSM900/
1800/1900 tripleband (EDGE) engine. Both the transmitter and receiver have been implement-
ed by using direct conversion architecture which means that the modulator and demodulator
operate at the channel frequency.
The core of the RF is an application-specific integrated circuit, Honi. Another core component
is a power amplifier module which includes two amplifier chains, one for GSM850/EGSM900
and the other for GSM1800/GSM1900.
Other key components include
• 26 MHz VCTCXO for frequency reference
• 3296-3980 MHz SHF VCO (super high frequency voltage controlled oscillator)
• Antenna switch module (ASM)
• Three SAW filters
• BAW-LNA module
The control information for the RF is coming from the baseband section of the engine through
a serial bus, referred later on as RFBus.
The whole RF circuitry is located on one side of the 8-layer PWB.
EMC leakage is prevented by using a metal shield with gasket. The RF circuits are separated
into two blocks.
• PA, ASM, TK balun
• Honi RF IC, VCO + balun, VCTCXO, BAW-LNA, Rx filter, Tx filter
The RF transmission lines constitute of striplines and microstriplines after PA.
Issue 1 12/04
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
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