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PAMS Technical Documentation
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
VR1
ON/OFF
VR2
ON/OFF
VR3
OFF
VR4
ON/OFF
VR5
OFF
VR7
OFF
VR8
ON/OFF
VR9
OFF
VR10
OFF
VR11
OFF
VR12
OFF
V5V
ON/OFF
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
Issue 1 10/00
800
800
MHz
MHz
Analog
Analog
Digital
Control
Traffic
Control
Channel
Channel
Channel
ON
ON
ON/OFF
ON
ON
ON/OFF
OFF
ON
ON
ON
ON/OFF
OFF
ON
OFF
ON
ON
ON
ON/OFF
OFF
OFF
OFF
OFF
ON/OFF* ON/OFF*
OFF
OFF
OFF
OFF
ON
ON
ON/OFF
NOTE: * ON during interband MAHO
E Nokia Mobile Phones Ltd.
System Module UT5U
800
800
1900
MHz
MHz
MHz
Digital
Digital
Traffic
Control
Channel
Channel
ON
ON/OFF
ON
ON/OFF* ON/OFF*
OFF
ON
OFF
ON/OFF
ON/OFF
OFF
ON/OFF
OFF
OFF
ON/OFF
OFF
ON/OFF
OFF
OFF
OFF
ON/OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON/OFF
NSW-5
1900
MHz
Digital
Traffic
Channel
ON
OFF
ON/OFF
ON/OFF
OFF
OFF
ON/OFF
ON
ON/OFF
ON/OFF
ON
Page 37
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