Ulrb; Figure 3.2 Ulrb Block Diagram Of Outdoor Spi-2331 - Samsung Mobile WiMAX Outdoor RAS SPI-2331 System Description

3.2.2 ULRB

The ULRB is the integrated RF board that carries out the transceiver function, power
amplifier function, TDD switch function, filter function, and the Low Noise Amplifier
(LNA) function.
The main functions of ULRB are as follows:
High-power amplification of RF transmission signal
Interfacing with ULDB in digital baseband I/Q(LVTTL) signal
Upconversion/downconversion of frequency
Rx/Tx RF signal from/to an antenna
Suppression of out-of-band spurious wave emitted from RF Rx/Tx signal
Low noise amplification of band-pass filtered RF Rx signal
TDD switching function for RF Tx/Rx path
Automatic Gain Control(AGC) for the received RF signal and Received Signal
Strength Indicator(RSSI) support
© SAMSUNG Electronics Co., Ltd.
Mobile WiMAX Outdoor RAS SPI-2331 System Description/Ed.02
ULRB
TDD Switch
RF(Tx)
TDD
PA
RF(Tx)
Up/Down Converter

Figure 3.2 ULRB Block Diagram of Outdoor SPI-2331

RF Ant.
Filter
RF(Tx/Rx)
RF(Rx)
LNA
RF(Rx)
Baseband I/Q
(LVTTL)
ULDB
3-5