A Fully Integrated 50–280-GHz Frequency Comb Detector for Coherent Broadband Sensing
IEEE Transactions on Terahertz Science and Technology(2019)
摘要
Broadband sensing and spectroscopy in millimeter wave and subterahertz frequencies can be facilitated with CMOS coherent detectors as a low-power, low-cost solution. This article presents a fully integrated coherent detector with a broadband frequency comb as an on-chip reference signal. The receiver incorporates a frequency comb generator, which provides a broadband comb as a reference for heterodyne detection, and an NMOS field-effect transistor as the heterodyne detector. It also includes an on-chip elliptical antenna with a periodic structure that enhances its directivity up to +10 dBi without using a lens. The receiver detects any arbitrary spectrum from 50 to 280 GHz with a resolution of 2 Hz by tuning the comb spacing of the reference signal from 100 MHz to 5 GHz. The chip is implemented in a standard 65-nm-CMOS process and it consumes 34-mW dc power.
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关键词
Broadband antennas,Detectors,Broadband communication,Substrates,Receivers,System-on-chip
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