一种应用于无线局域网的无源CMOS混频器

Design of a Passive CMOS Mixer for Wireless LAN Application

针对一种双平衡结构的无源 CMOS混频器 ,分析了它的转换增益、噪声系数和线性等参数 ,在此基础上 ,推导了它的电路设计方程。设计了该混频器应用于 2 .4GHz无线局域网 ( WLAN)的电路拓扑 ,并应用 TSMC的 0 .1 8μm CMOS工艺进行了仿真。结果显示 ,在 1 .8V的工作电压下 ,该混频器具有非常出色的性能指标 ,转换增益最大为 - 1 .2 d B,噪声系数为 6.3 d B,1 d B压缩点为 - 4d B,功耗小于 1 m W。提出了一种数字有限冲激响应 ( FIR)滤波器电路的设计思想 ,克服了传统的从算法直接入手的滤波器设计方法中存在的计算量大、电路描述繁琐以及验证困难的缺点。并按此思想设计了一个通用数字 FIR滤波器电路 ,在利用 Matlab工具构造出滤波器数学模型的基础上 ,提出了一种滤波器电路结构 ,用 VHDL语言对电路进行描述 ,并进行了电路综合和仿真。

A doublebalanced passive mixer is presented in the paperConversion gain,noise figure and linearity of the circuit are analyzedThe equations for circuit design have been derived based on the analysisA corresponding mixer circuit is designed and simulated with a circuit model provided by TSMC's 018 μm CMOS technologyResults show that this passive mixer has excellent performancesAt an RF frequency of 24 GHz for wireless LAN applications with supply voltage down to 18 V, its maximum conversion gain is up to -12 dB,while the -1 dB compression point and the single band NF are -4dB and 63dB,respectively,and a power consumption less than 1 mW has been achieved