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实现了一个应用于IEEE802.11b无线局域网系统的2.4GHzCMOS单片收发机射频前端,它的接收机和发射机都采用了性能优良的超外差结构.该射频前端由五个模块组成:低噪声放大器、下变频器、上变频器、末前级和LO缓冲器.除了下变频器的输出采用了开漏级输出外,各模块的输入、输出端都在片匹配到50Ω.该射频前端已经采用0.18μmCMOS工艺实现.当低噪声放大器和下变频器直接级联时,测量到的噪声系数约为5.2dB,功率增益为12.5dB,输入1dB压缩点约为-18dBm,输入三阶交调点约为-7dBm.当上变频器和末前级直接级联时,测量到的噪声系数约为12.4dB,功率增益约为23.8dB,输出1dB压缩点约为1.5dBm,输出三阶交调点约为16dBm.接收机射频前端和发射机射频前端都采用1.8V电源,消耗的电流分别为13.6和27.6mA.
A 2.4 GHz CMOS monolithic transceiver RF front end implemented in the IEEE802.11b wireless LAN system has been implemented using a super-heterodyne structure with excellent performance for both the receiver and the transmitter.The module consists of five modules: low noise Amplifier, downconverter, upconverter, last stage and LO buffer. In addition to the output of the downconverter with open-drain output, the input and output of each module are chip matched to 50Ω. The RF front end has been Using 0.18μmCMOS technology.When the low noise amplifier and the downconverter direct cascade, the measured noise figure of about 5.2dB, the power gain of 12.5dB, the input 1dB compression point of about -18dBm, the input third-order intercept point About-7dBm. When the upconverter and the last pre-cascade direct cascade, the measured noise figure of about 12.4dB, the power gain of about 23.8dB, the output 1dB compression point of about 1.5dBm, the output of the third-order intercept point About 16dBm. Receiver RF front-end and transmitter RF front-end are 1.8V power supply, respectively, the current consumption of 13.6 and 27.6mA.