TI TSW5002 RF收发器参考设计

　　TI的TSW5002EVM是工作在2.5GHz TDD模式的RF/模拟收发器参考设计,它包括TX IF上变换器TRF1121,TX RF上变换器TRF1121,TX功率放大器TRF1123,以及LNA和下混频器TRF1112与RX IF下变换器TRF1115.

　　它也可以和数字基带处理器卡合并使用.单独使用时,参考设计板和接口板合并使用,方便地提供可编程板以及把RF信号引入和导出RF测试设备.

TSW5002EVM is a RF/Analog transceiver reference design for 802.16 operating in TDD mode at 2.5 GHz band. It includes TRF1121 - a TX IF upconverter, TRF1122 - a TX RF upconverter, TRF1123 - TX power amplifier, TRF1112- an integrated LNA and down mixer and TRF1115- RX IF downconverter. It is designed to merge with a digital baseband processing card. For stand alone evaluation, the reference board can be merged with the interface board to facilitate programming the board and piping RF signals into and out to RF test equipment.

TSW5003/TSW5002 Reference Design. The reference board is a RF/Analog transceiver operating in TDD mode designed to merge with a digital baseband processing card. For stand alone evaluation, the reference board can be merged with the interface board to facilitate programming the board and piping RF signals into and out to RF test equipment.

Features:

Complete RF transceiver reference design.
Flexible to interface to multiple base band processors.
Can be evaluated as stand alone RF transceiver.

　　参考设计方框图:

The basic block diagram of the reference design is shown in Figure 1.
The TRF1221 (TRF1121) is a TX IF upconverter that includes two internal synthesizers: one lower frequency synthesizer for the internal mixer and one higher frequency synthesizer that is piped externally for the RF upconverter. The device also includes a 5-bit 1-dB digital attenuator as well as gain stages for the low and intermediate IF frequencies.

The TRF1222 (TRF1122) is a TX RF upconverter that accepts its LO frequency from the TRF1221. It also includes IF and RF gain stages, and the option for external image reject filtering.

The TRF1223 (TRF1123) is a RF PA device with 30 dB of gain and CW power capability of over 30 dBm in the high-power mode. For more efficient operation, the device can be operated in the low power mode.
The TRF1216 (TRF1115) is an integrated LNA and mixer. It has the option for external image reject filtering, and it also includes an IF gain control amplifier.

The TRF1X12 (TRF1212) is a TX IF downconverter that includes two integrated synthesizers: one lower frequency synthesizer for the internal mixer and one higher frequency synthesizer that is piped externally for RF downconverter. The device also includes AGC amplifiers with over 90 dB of dynamic range and the option to include two switchable IF filters for different signal bandwidth requirements.
下面是参考设计电路图;

　　图1.

图2.



图3.接收通路LNA/第一级下变换(DCON):



图4.接收通路,本地振荡/第二级DCON



图5.RX ADC带通滤波器



图6.发送通路第一级上变换/本地振荡1和本地振荡2



图7.发送通路.第二级上变换

图8.发送通路功率放大器

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