Zero-Bias 50-dB Dynamic Range Linear-in-dB V-Band Power Detector Based on CVD Graphene Diode on Glass

Abstract

In this paper, we report the design, fabrication, and demonstration of a compact, V-band, zero-bias, and linear-in-dB power detector based on our in-house metal–insulator–graphene diode fabricated on a glass substrate. The presented circuit is optimized for the frequency band of 40–75 GHz. The measured prototype shows a repeatable measured dynamic range of at least 50 dB with down to −50 dBm sensitivity on 500- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> -thick quartz substrate. It also shows input return loss better than −9.5 dB over the entire design bandwidth. The measured tangential responsivity for the fabricated circuit on glass is 168 V/W at 2.5 GHz and 15 V/W at 60 GHz. The obtained results together with the robust device fabrication based on chemical vapor deposition graphene promote the proposed scheme and device for repeatable, statistically stable millimeter-wave, and submillimeter-wave applications.