原标题：TI TRF2443宽带无线IF收发方案

　　TI 公司的TRF2443是高度集成全双工宽带无线IF收发器,接收器集成了IQ解调器,通过模拟和数字控制的VGA可提供大于90dB的增益,可编程的基带低通滤波器能灵活地接收不同带宽的信号,TX输出IP3为29.5dBm,TX输出噪音为-166dBc/Hz.TX信号链(165-175MHz / 330-350MHz),RX信号链(140-165MHz / 280-330MHz),主要应用在点对点微波,宽带无线接入,无线微波骨干线路和WiMAX IF收发器.本文介绍了TRF2443的主要特性,功能方框图, 接收链路方框图, RX和TX PLL方框图, XPIC方框图, 应用电路图以及TRF2443评估模块主要特性,电路图, 布局图(和所用材料清单.

　　Integrated IF Transceiver for Broadband Wireless Applications

　　TRF2443 is a highly integrated full-duplex intermediate frequency (IF) transceiver designed for broadband point-to-point wireless communications applications. The receiver chain integrates a quadrature (IQ) demodulator and provides more than 90 dB of gain range, obtained via a combination of analog and digital controlled VGAs. The integrated programmable baseband low-pass filter gives the TRF2443 the flexibility to receive signals with different bandwidths, while also helping to remove interferer signals before they reach the ADC. Additionally, the TRF2443 gives the flexibility to add an external IF filter to further remove unwanted signals. The TRF2443 transmitter chain integrates a quadrature (IQ) modulator driving a highly linear IF DVGA that provides 35 dB of gain range controlled via a serial programming interface (SPI). The TRF2443 includes the two synthesizers for the receiver and transmitter chains, removing the need for external LO generation circuitry and simplifying the implementation of a frequency-division duplexing (FDD) transceiver design. The TRF2443 also provides Cross-Polarization Interference Cancellation (XPIC) support via an integrated XPIC output amplifier and receiver chain. The TRF2443 is an ideal building block for implementing the IF transceiver function in the Indoor Unit (IDU), which is connected via coaxial cable interface to the Outdoor Unit (ODU), of a point-to-point microwave backhaul split-architecture system.

　　TRF2443主要特性:

　　Integrated TX Chain (165-175MHz / 330-350MHz)

　　Baseband Amplifiers

　　Quadrature Modulator

　　Digitally Controlled VGA

　　TX Output IP3: 29.5dBm

　　TX Output Noise: -166dBc/Hz

　　Integrated RX Chain (140-165MHz / 280-330MHz)

　　IF Amplifiers

　　Analog and Digital VGA

　　Quadrature Demodulator

　　Baseband Filters

　　ADC Buffers

　　IF SAW Filter Bypass

　　RX Noise Figure: 4.3dB

　　RX Input IP3: 9.5dBm

　　Integrated TX and RX Synthesizers

　　Integrated Cross-Polarization Interference Cancellation (XPIC) Support

　　Auxiliary RX Chain

　　TRF2443应用:

　　Wireless Microwave Backhaul

　　Point-to-Point Microwave

　　Broadband Wireless Applications

　　WiMAX IF Transceiver

　　图1.TRF2443功能方框图

　　图2.TRF2443接收链路方框图

　　图3.TRF2443 RX和TX PLL方框图

　　图4.TRF2443 XPIC方框图

　　图5.TRF2443应用电路图

　　TRF2443 IF收发器评估模块

　　TRF2443 Integrated IF Transceiver Evaluation Module

　　The TRF2443EVM is the evaluation board for the TRF2443 integrated IF transceiver for broadband wireless applications. The TRF2443EVM includes instructions for equipment setup procedures, software GUI configurations, and test procedures that allow a user to quickly and accurately measure the TRF2443 performance characteristics.The TRF2443EVM can be used to select options for trimming the device configuration in order to meet various application requirements.

　　TRF2443 评估模块主要特性:

　　Comprehensive test capability for the TRF2443

　　USB connection from EVM to PC

　　Software support with a fully featured GUI for easy testing

　　TRF2443 on-chip EEPROM access guide

　　材料清单: