@inproceedings{c69bf54b489145328cb314effd56ad4c,
title = "Direct Digital RF Technology-Challenges for beyond Nyquist Frequency Range",
abstract = "Since the maximum operational frequency of digital RF based on A/D and D/A is Nyquist frequency, it has been difficult to apply digital RF concept to higher microwave frequency range. In this paper, direct digital RF technology is introduced to break this Nyquist limit. This technology utilizes the higher-order Nyquist Zones (beyond the Nyquist frequency range) and higher microwave frequency signal can be handled directly. Higher order direct RF undersampling architecture is introduced for receiver and a fabricated results of 28GHz-band receiver using 1GHz sampling clock will be shown. A 1-bit bandpass\mathbf\Delta\mathbf\Sigma modulator is introduced for transmitter which generates a 26GHz-band RF signal directly from 8Gbps 1-bit digital stream. In order to enhance the image signal level and SNR, RZ signaling and Manchester coding techniques are examined. This direct digital RF technology brings really digital rich microwave/MMW transceivers in future CMOS era.",
keywords = "ADC, CMOS, DAC, Digital RF, Microwaves, RFIC, sub-sampling, Transceivers, under-Sampling",
author = "Noriharu Suematsu",
note = "Funding Information: A part of this work is supported by the Ministry of Internal Affairs and Communications for the project entitled “R&D on Technologies to Densely and Efficiently Utilize Radio Resources of Unlicensed Bands in Dedicated Areas.” It was also carried out under the Cooperative Research Project Program of the Research Institute of Electrical Communication,Tohoku University. Publisher Copyright: {\textcopyright} 2018 IEEE.; 2018 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2018 ; Conference date: 15-08-2018 Through 17-08-2018",
year = "2018",
month = nov,
day = "5",
doi = "10.1109/RFIT.2018.8524086",
language = "English",
series = "2018 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2018",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2018 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2018",
address = "United States",
}