Rf Asic Helga; Afc Function; Antenna - Nokia NPM-6 Series Manual

CCS Technical Documentation

RF ASIC Helga

The RF ASIC module includes:
- Package uBGA108
- Balanced I/Q demodulator and balanced I/Q modulator
- Power control operational amplifier, acts as an error amplifier
- The signal from VCO is balanced, frequencies 3420 to 3980 MHz
- EGSM900 and GSM1800 low noise amplifier (LNA) are integrated.
The Helga can be tested by test points only.

AFC function

AFC is used to lock the transceiver's clock to the frequency of the base station.

Antenna

The NPM-6 EGSM900/GSM1800/GSM1900 transceiver features an internal antenna.
Issue 1 01/03
System Module and User Interface
Figure 19: Power amplifier
900
EGSM
out
DCS/
GSM1800/1900
PCS
out
EGSM900
GSM1800/1900
EGSM DCS/PCS
Power Power
control control
ãNokia Corporation.
900
EGSM
in
DCS/
GSM1800/1900
PCS
in
Power
detector
Mode
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