基于电感源极退化技术的高线性混频器设计

Design of high linearity mixer using inductive source degeneration

基于电感源极退化技术设计了一款新颖的高线性度正反馈跨导放大器,并且将该跨导放大器应用于折叠结构式混频器当中。通过抵消反相器和辅助放大器之间的三阶跨导分量,改善了其线性度。电路采用TSMC 0.13μm CMOS工艺进行设计与仿真,完成了版图设计与流片。与传统结构相比,该混频器的输入三阶交调点IIP3高达8.6 dBm,噪声系数为10.9 dB,增益高达14 dB,并且取得了更优的归一化FOM指标。

This paper presents a novel linearity- improvement feed- forward amplifier whose transconductance stage use the inductive source- degeneration technology. The proposed technique is applied to a CMOS RF mixer based on a folded- type topology. Linearity improvement is achieved by cancelling the third- order transconductance terms between the inverter and auxiliary amplifiers. Simulated results show that the proposed mixer achieves a third- order input intercept point of 8. 6 dBm, a noise figure of 10. 9 dB, a conver-sion gain of 14 dB, and has the highest figure- of- merit among other linearity improved mixers that have been previously reported.