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TI TRF2443宽带无线IF收发方案

2010-07-08 来源：微波射频网字号：大中小

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