A ${D}$ -Band Digital Transmitter with 64-QAM and OFDM Free-Space Constellation Formation
| Autor: | Stefan Shopov, Ozan Dogan Gurbuz, Sorin P. Voinigescu, Gabriel M. Rebeiz |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Orthogonal frequency-division multiplexing business.industry 020208 electrical & electronic engineering Transmitter 020206 networking & telecommunications 02 engineering and technology Effective radiated power Optics D band 0202 electrical engineering electronic engineering information engineering Baseband Electrical and Electronic Engineering business Frequency modulation Quadrature amplitude modulation Phase-shift keying |
| Zdroj: | IEEE Journal of Solid-State Circuits. 53:2012-2022 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | A ${D}$ -band I/Q RF-DAC featuring two 6-bit DAC elements driven in quadrature, each with its own on-die antenna, and a total effective isotropic radiated power (EIRP) of 13.2 dBm, is demonstrated in a 45-nm SOI-CMOS technology. The carrier signal is first amplified by the 30-dB gain LO path and is directly modulated by the 12 baseband bit streams, without linear upconversion or power amplification. QPSK, 8-PSK, 16-QAM, 32-QAM, and 64-QAM single-carrier (SC) and OFDM constellations are formed in free space and measured above the die at data rates up to 12 Gb/s and at distances over 15 cm. The large-signal bandwidth—from the carrier input pad to the output of the transmitter above the antennas—is 130–142 GHz and was obtained by sweeping the frequency of the ${D}$ -band external carrier, modulating it on die at 0.4 Gb/s using 16-QAM format, and measuring the error vector magnitude (EVM) with an instrumentation receiver. The highest data rate of 12 Gb/s was measured for QPSK SC modulation with a corresponding EVM of −12.2 dB. Lower maximum data rates of 7 Gb/s with −14.3-dB EVM and 3.6 Gb/s with −19-dB EVM were observed for 16-QAM and 64-QAM formats, respectively. Spectral shaping and OFDM transmission were also demonstrated at up to 2.5 Gb/s. The prototype consumes a total of 1.25 W, with an energy efficiency of 104 pJ/b. |
| Databáze: | OpenAIRE |
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