WCDMA receiver tunings
RX calibration (WCDMA)
Context
Rx calibration tuning routine calculates the real gain values of the WCDMA Rx AGC system. There is also a SAW
filter between front end LNA and mixer in the receive chain, which causes ripple in the RSSI measurement,
this is calibrated out. The SAW filter is intergated into RF ASIC N7500.
Rx calibration can be done in two different ways, manual tune and sweep mode tune. If the signal generator
in use supports frequency sweep table, the calibration is done in one step.
Steps
1. For manual tuning, set mode to Local in the Operating Mode dropdown menu.
2. In the Tuning menu, choose WCDMA→Rx Calibration .
3. Click Start.
4. Select Band "WCDMA2100 or WCDMA850".
5. Click Tune.
6. Setup the signal generator to correspond with the values on the,
Rx Calibration
pop-up window and click
OK.
Figure 31 Pop-up window for WCDMA2100
RM-243
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –43
Copyright © 2007 Nokia. All rights reserved.
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