Rx Paths Of Rf Asic - Nokia NPL-4 Series Troubleshooting Instructions

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RX paths of RF ASIC

The balanced GSM 850/900 and GSM 1800 RX signals are amplified by one integrated
LNA for each band and the subsequent pre-gain stages. The GSM 1900 signal is fed to
the pre-gain stage also used for the GSM 1800 signal. After amplification the RX signals
are down-converted.
The RX paths of the RF ASIC consist of following sub units:
• Separate LNAs for each of the bands: GSM 850/900, and GSM1800.
• Two PRE-GAIN amplifiers, one for GSM 850/900 and one for GSM1800
and GSM1900.
• Two passive I/Q mixers (MIX), one for GSM 850/900 and one for
GSM1800 and GSM1900.
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential NPL-4/5/
Troubleshooting Instructions
Page 27