User Guide

CCS Technical Documentation System Module and User Interface
Company confidential RH-23
Issue 1 02/2004 Nokia Corporation. Page 47
Power Amplifier
The power amplifier features include:
• 50 ohm input and output, EGSM900/GSM1800
• internal power detector
• EDGE mode
RF ASIC Helgo
The RF ASIC features include:
• 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 3840 MHz
• EGSM900 and GSM1800 low noise amplifier (LNA) are integrated.
AFC Function
AFC is used to lock the transceiver’s clock to the frequency of the base station.
Antenna
The RH-23 EGSM900/GSM1800 transceiver features an internal antenna.