Abstract
Design, implementation, and characterisation of a compact MMIC millimetre-wave square-law power detector with a wide dynamic range (DR) is presented. The proposed design exploits an optimised graphene-based diode with a record zero-bias short-circuit current responsivity of 71 V<sup>−1</sup>. The diode is integrated alongside with our in-house, thin-film MMIC technology which is fabricated on a 500-µm rigid quartz substrate. The fabricated prototype occupies 0.1 mm<sup>2</sup> of chip area including pads. Measurement results show wide input matching from 40 – 70 GHz with measured S<inf>11</inf> better than −13 dB over the design bandwidth. The measured dynamic range is 70 dB, and the voltage responsivity is 98 mV/mW at 60 GHz. Measured video-bandwidth (VBW) is 2.2 GHz. To our best knowledge, the presented prototype has the widest dynamic range of all published square-law detectors.
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