JSSC 2009第5期RF & Wireless0.18 μm CMOS

Integrated Quadrature Couplers and Their Application in Image-Reject Receivers

本文介绍了几种全集成多级集总元件正交混合器，用于提高带宽、幅度和相位精度，并描述了一种使用两级Lange/Lange耦合器的全集成双正交外差接收器前端。

55 dB图像抑制比，200 MHz带宽，5.25 GHz中心频率，23.5 dB增益，-79 dBm灵敏度，5.6 dB SSB NF，7 dBm IIP3，1 mm x 2 mm芯片面积

正交混合器Lange耦合器图像抑制接收器全集成CMOS

▸全集成多级集总元件正交混合器

▸两级Lange/Lange耦合器设计

▸无需调谐、修剪或校准的高图像抑制比

Abstract

ber , IEEE, and David J. Allstot , Fellow, IEEE Abstract—Several fully-integrated multi-stage lumped-element quadrature hybrids that enhance bandwidth, amplitude and phase accuracies, and robustness are presented, and a fully-inte- grated double-quadrature heterodyne receiver front-end that uses two-stage Lange/Lange couplers is described. The Lange/Lange cascade exploits the inherent wide bandwidth characteristic of the Lange hybrid and enables a robust design using a relatively low transformer