User Guide

Nokia Customer Care Troubleshooting Instructions

Company confidential NPL-4/5

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.