Transmitter Description And Troubleshooting; Power Amplifier; Rf Asic Honi - Nokia RAE-6 Rf Description And Troubleshooting

RAE-6/RA-4
7 - RF Description and Troubleshooting

Transmitter description and troubleshooting

The transmitter consists of:
• two final frequency IQ-modulators
• two power amplifiers, for the lower and upper bands separately
• power control loop.
The IQ-modulators are integrated in Honi, as well as the operational amplifiers of the power
control loop. The two power amplifiers are located in a single module with a power detector. In
the GMSK mode, the power is controlled by adjusting the DC bias levels of the power amplifi-
ers.

Power amplifier

The power amplifier features include:
• 50 ohm input and output, GSM850/EGSM900/GSM1800/GSM1900
• internal power detector
• EDGE mode

RF ASIC Honi

The RF ASIC features include
• Package LFGBGA88
• 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 3296 to 3980 MHz
Issue 1 12/04
Figure 9: Power amplifier
EGSM900/GSM850
EGSM
out
GSM1800/
DCS/
1900
PCS
out
GSM1800/
1900
EGSM900
GSM850
EGSM DCS/PCS
Power Power
control control
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Nokia Customer Care
EGSM900
GSM850
EGSM
in
GSM1800/
DCS/
1900
PCS
in
Power
detector
Mode
27