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An improved architecture of an active quasi-circulator (QC) is proposed for monostatic FMCW automotive radars. Special attention is paid on the receiver noise figure (NF) performance as well as high transmit (TX) to receive (RX) signal isolation. The high TX/RX isolation is achieved by using a W-band CMOS based impedance tuner acting as a leakage canceler. Also process variation as well as antenna...
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...
A modified structure of an active quasi-circulator (QC) is proposed for receive signal (RX) and transmit signal (TX) separation in 77-GHz monostatic FMCW radars. The circuit includes an impedance tuner, operating as leakage canceler, which performs compensation for process variations, parasitics of transistors as well as antenna mismatch. Additionally, the TX path is designed to be passive, to avoid...
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