用于IEEE 802.11b/gWLAN直接下变频接收机的射频前端设计

Design of a Direct-conversion IEEE 802.11b/g WLAN Receiver RF Front-end

介绍了一种应用于IEEE 802.11b/g无线局域网接收机射频前端的设计。基于直接下变频的系统架构,接收机集成了低噪声放大器、I/Q下变频器、去直流偏移滤波器、基带放大器和信道选择滤波器。电路采用TSMC 0.18μm CMOS工艺设计,工作在2.4 GHz ISM(工业、科学和医疗)频段,实现的低噪声放大器噪声系数为0.84 dB,增益为16 dB,S11低于-15 dB,功耗为13 mW;I/Q下变频器电压增益为2 dB,输入1 dB压缩点为-1 dBm,噪声系数为13 dB,功耗低于10 mW。整个接收机射频前端仿真得到的噪声系数为3.5 dB,IIP3为-8 dBm,IP2大于3 0 dBm,电压增益为3 1 dB,功耗为32 mW。

This paper describes a design of the RF front-end for an IEEE 802.11 b/g WLAN receiver. Based on a direct-conversion architecture, the receiver integrates LNA, I/Q mixer, DC-offset removal filter, baseband amplifier and channel-select filters on a single chip. Designed and simulated in a 0. 18 μm CMOS technology, the receiver works in 2.4 GHz ISM band. The LNA achieves a noise figure of O. 84 dB, power gain of 16 dB, Sn below - 15 dB and dissipating 13 mW power. The Gilbert mixer achieves 2 dB voltage gain, 1 dB input compression point of - 1 dBm, noise figure of 13 dB, and below 10 mW power consumption. The receiver achieves a noise figure of 3.5 dB, IIP3 of - 8 dBm, IP2 above 30 dBm, and voltage gain of 31 dB, while dissipating 32 mW from a 1.8-V supply.