Nokia NHM-1 Series - WCDMA RX AGC Tuning

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CCS Technical Documentation

NHM-1

WCDMA RX AGC Tuning

A signal generator is needed to provide a test signal into the WCDMA RF test connector.

• Calibration is started from the Phoenix menu:

Tunings/WCDMA/RX AGC Alignment

• Press “Start” then “Tune”.

• The calibration routine will define the signal generator settings for you.

• When you have applied the test signal - click “OK”.

• The calibration values are then calculated and stored into PM.

Note: With the “Read” - button you can check the values stored in PM.

Definitions of the parameters saved are:

RX chain gain: This is the overall receiver gain error compared to expected value

in dB’s.

LNA mid gain error: This is the difference in LNA’s gain step compared to expected

value in dB’s.

LNA low gain error: This is the difference in LNA’s gain step compared to expected

value in dB’s.

AGC slope error: This is the gain slope error in the baseband analog AGC gain stages.

LNA bias error: This is the difference in the LNA maximum gain with full and half

bias current.

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