NSW-5
System Module UT5U
PAMS Technical Documentation
Page 37
Issue 1 10/00
Nokia Mobile Phones Ltd.
mixer. After the mixing TX signal is amplified by a driver stage. From
driver stage the signal is fed trough the TX filter to PA MMIC.
The PA amplifies the TX signal by 28–32 dB. Amplified TX signal is fil-
tered in the duplex filter. Then signal is fed to the antenna, where the
maximum output level is typically 480 mW.
The power control loop controls the gain of the EROTUS gain control
stage. The power detector consists of a directional coupler and a diode
rectifier. The output voltage of the detector is compared to TXC voltage in
EROTUS. The power control signal (TXC), comes from the RF interface
circuit, COBBA_D. TXP signal sets driver power down to ensure off–burst
level requirements.
False transmission indication is used to protect transmitter against false
transmission caused by component failure. Protection circuit is in ERO-
TUS. The level for TXF is set by internal resistor values in EROTUS.
TDMA1900 TX
See 800 MHz digital mode transmitter.
DAMPS800/TDMA1900 operation
Supply voltages in different modes of operation
800
MHz
Ext.
Stadby
800
MHz
Analog
Control
Channel
800
MHz
Analog
Traffic
Channel
800
MHz
Digital
Control
Channel
800
MHz
Digital
Traffic
Channel
1900
MHz
Digital
Control
Channel
1900
MHz
Digital
Traffic
Channel
VR1 ON/OFF ON ON ON/OFF ON ON/OFF ON
VR2 ON/OFF ON ON ON/OFF ON ON/OFF* ON/OFF*
VR3 OFF OFF ON OFF ON OFF OFF
VR4 ON/OFF ON ON ON/OFF ON/OFF ON/OFF ON/OFF
VR5 OFF OFF ON OFF ON/OFF OFF ON/OFF
VR7 OFF OFF ON OFF ON/OFF OFF OFF
VR8 ON/OFF ON ON ON/OFF ON/OFF OFF OFF
VR9 OFF OFF OFF OFF OFF ON/OFF ON/OFF
VR10 OFF OFF OFF ON/OFF* ON/OFF* ON ON
VR11 OFF OFF OFF OFF OFF OFF ON/OFF
VR12 OFF OFF OFF OFF OFF OFF ON/OFF
V5V ON/OFF ON ON ON/OFF ON ON/OFF ON
NOTE: * ON during interband MAHO
Software Compensations
Power Levels (TXC) vs. Temperature
Because of wide temperature range, it is neccessary to compensate the
effect of temperature on the output power. To monitor this environment
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