JSSC 2007第12期RF & Wireless

A Fully Integrated MIMO Multiband Direct Conversion CMOS Transceiver for WLAN Applications (802.11n)

一款用于WLAN应用的全集成多频段直接转换CMOS MIMO收发器芯片

PHY速率达48Mb/s，EVM优于-52dB（0.9%），RX模式275mA，TX模式280mA

MIMO直接转换CMOS收发器WLAN802.11n

▸创新点1：支持802.11n标准的多输入多输出(MIMO)技术（系统创新）。该论文实现了2×2 MIMO架构，显著提升了数据传输速率和范围，PHY速率达到48-55Mb/s，相比传统WLAN系统有显著性能提升。

▸创新点2：全集成直接转换架构（电路创新）。采用零中频（direct-conversion）设计，消除了传统超外差架构中的中频级，降低了系统复杂度和功耗，芯片在1.8V供电下仅消耗275mA（RX）和280mA（TX）。

▸创新点3：多频段操作能力（系统创新）。支持802.11a/g/n多频段操作，接收机和发射机在legacy g和a模式下分别实现EVM优于-52/-49dB（0.9%）和-52/-48dB（1.0%），展现了优异的跨频段兼容性。

▸创新点4：高性能EVM指标（电路创新）。在直接转换架构下实现了优异的误差向量幅度（EVM）性能，满足802.11n严格调制要求，为高吞吐量MIMO通信提供了硬件保障。

Abstract

802.11n is the latest offering from the IEEE standard committee tasked with enabling and enhancing WLAN systems. This standard utilizes several techniques to offer a much larger rate versus range than the legacy WLAN systems. A single-chip multiband direct-conversion CMOS MIMO transceiver (2 2) targeted for WLAN applications is presented. This transceiver is capable of satisfying the requirements of the draft 802.11n stan- dard and achieves PHY rates of /50/55/48Mb/s. The receivers and transmitters achieve an EVM of better than /52/49dB (0.9%) and /52/48dB (1.0%) operating in legacy g and a modes, respectively. From a 1.8 V supply and with both cores operating, the chip draws 275 mA in RX mode and 280 mA in TX mode.