5GHz高线性度CMOS混频器的设计

Design of 5GHz High Linearity CMOS Mixer

文中分析了混频器的线性度与转换增益之间的关系,提出了一种提高Gilbert混频器线性度的方法,并设计了5GHz频段适用于802.11a标准的高线性度混频器。电路采用0.18μm CMOS工艺,通过Cadence SpectreRF仿真与优化,得到10.25dBm的1dB压缩点,-2.24dB的转换增益,26dB的噪声系数,整个混频器达到了较高的线性度。

On the basis of analyzing the relationship of the linearity and conversion gain of the Gilbert mixer, a new technique is presented to improve the linearity of the Gilbert mixer firstly. And then a 5 GHz high linearity mixer which applying to the 802.11a standard is designed in 0. 18um CMOS technology. Simulation results of the circuit using Cadence SpectreRF show a better performance with a 10.25 dBm ldB compress point, -2.5 dB conversion gain, 26 dB noise figure.