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3 Board
Figure 3-26 PBU functional structure
26V
The PBU couples the 40 W output power signals from the TRX as main channel signals and
couples channel signals. The main channel signals are input into the power synthesizing unit
after delay filtering, and the coupling channel signals are input into power synthesizing unit
after
60 W PA. To get the final synthesizing signal, it is necessary to control the range and phase of
these two channels of input synthesizing signals. The generation of control signals, collection
of alarms, and reporting of alarms are implemented by the alarm management module. The
coupling, controlling, and synthesizing of power signals are implemented by the network.
PA Synthesizing Module
Under the control of alarm collection and management module, the PA synthesizing module
amplifies the TRX output signals. It also provides PA control and alarm information (positive
input power and positive output power demodulation signals), alarm signals (over-
temperature, standing wave alarm) to alarm collection and management module so that it can
perform PA test and alarm reporting.
The PA synthesizing module contains:
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The input coupling and delay filter couple the 40 W output signals from TRX as main channel
signals and coupling channel signals (main channel signals count for most part of the energy).
The main channel signals are sent to an entrance of power synthesizing and test unit after it is
adjusted delay processing at the filter.
The range and phase adjusting of coupling channel signals are necessary for power
synthesizing. They are done by alarm collection and management module. Then the power is
amplified to 60 W to be sent to another entrance of the power synthesizing and test unit. The
two channels of input signals can obtain the final PBU output power after power synthesizing,
and is ready for output.
3-38
RF signal input
Range and phase
26V
Power
±
supply
8V
module
26V
PA control signal
±
8V
Alarm output
Input coupling
Delay filter/range/phase control
60 W PA
Power synthesizing and test
Huawei Technologies Proprietary
M900/M1800 BTS3X Series Base Transceiver Station
Coupling and delay filter
60W PA
control
PA control
Alarm collection
generating
Hardware Description Manual
Power
synthesizing
and test
PA Synthiesizing Module
Alarm collection
and output
Alarm Management Module
PBU
Issue 01 (2006-11-18)
RF signal
output
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