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首页> 外文会议>IEEE MTT-S International Microwave Symposium >High bandwidth of 8 GHz active quasi-circulator with integrated digital leakage canceler in SiGe BICMOS technology for automotive radar systems
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High bandwidth of 8 GHz active quasi-circulator with integrated digital leakage canceler in SiGe BICMOS technology for automotive radar systems

机译：具有SiGe BICMOS技术的集成数字泄漏消除器的8 GHz有源准循环器的高带宽，适用于汽车雷达系统

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摘要

An active quasi-circulator (QC) with high bandwidth is proposed for monostatic FMCW automotive 77-GHz radar sensors. The QC is build around a commonly used differential LNA. As the layout of the QC is symmetrical in contrast to traditionally active QCs, the system is robust and offers a high bandwidth in respect with transmit (TX) to receive (RX) signal isolation. A single ended to differential conversion is also provided by the proposed structure without any additional losses, which directly improves the noise figure (NF) performance of the receiver. Effects like process variations and antenna mismatch can be compensated by a digitally controlled CMOS based impedance tuner acting as a leakage canceler. The system has been fabricated in a 250-GHz fT Silicon-Germanium (SiGe) BiCMOS technology. The QC performance is demonstrated based on on-wafer measurements. Over a 10-GHz bandwidth, the receiver gain is higher than 7 dB, whereas the insertion loss of the passive TX-path is around 6.5 dB. Assuming an isolation of 30 dB, the bandwidth remains 8 GHz, which is sufficient for automotive radar systems.
机译：针对单静态FMCW汽车77 GHz雷达传感器，提出了一种具有高带宽的有源准循环器（QC）。 QC建立在常用的差分LNA的周围。与传统的有源QC相比，由于QC的布局是对称的，因此该系统具有强大的功能，并且相对于发送（TX）到接收（RX）信号隔离提供了高带宽。所提出的结构还提供了单端到差分转换，而没有任何额外的损失，这直接改善了接收机的噪声系数（NF）性能。诸如过程变化和天线失配之类的影响可以通过充当漏气消除器的基于CMOS的数字控制阻抗调谐器来补偿。该系统采用250 GHz fT硅锗（SiGe）BiCMOS技术制造。基于晶圆上的测量证明了QC性能。在10 GHz带宽上，接收器增益高于7 dB，而无源TX路径的插入损耗约为6.5 dB。假设隔离度为30 dB，则带宽保持为8 GHz，足以用于汽车雷达系统。

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