Abstract

Wireless performance of a 300 GHz CMOS transmitter reported recently is presented. Wireless digital data transmission at 28 Gbit/s over 5 cm with 16-QAM and 1 Gbit/s over 1 m with quaternary phase-shift keying was achieved. A figure of merit (FoM) for transmit–receive systems that allows comparison of diverse configurations (with different modulation formats, antenna gains, distances, etc.) is introduced. The CMOS transmitter turns out to be comparable in performance to other 0.3 THz or higher systems involving compound-semiconductor or photo-mixing technologies. Analysis based on the FoM reveals how best use could be made of frequencies around 300 GHz with a CMOS technology.

Highlights

  • The frequency band above 275 GHz currently remains unallocated, and its spectrum allocation is due to be discussed

  • We recently reported a 300 GHz CMOS transmitter that operates above the transistor unity-power-gain frequency fmax but supports high-order digital modulation such as the quadrature amplitude modulation (QAM) [7, 8]

  • Comparison of transmit–receive systems: To put the experimental wireless performance of the 300 GHz CMOS transmitter into perspective, we introduce a figure of merit (FoM) that allows comparison of transmit–receive systems with diverse configurations

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Summary

Introduction

The frequency band above 275 GHz currently remains unallocated, and its spectrum allocation is due to be discussed. We recently reported a 300 GHz CMOS transmitter that operates above the transistor unity-power-gain frequency fmax but supports high-order digital modulation such as the quadrature amplitude modulation (QAM) [7, 8]. The experimental data presented in [7, 8] were obtained mostly by directly connecting a measurement system to the transmitter through a waveguide. In this Letter, we present the transmitter’s wireless capability and discuss how the relatively unexplored frequency band should be covered.

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