University of Oulu

Sethi, A., Aikio, J.P., Shaheen, R.A. et al. Analog Integr Circ Sig Process (2019) 98: 419.

A four channel phased array transmitter using an active RF phase shifter for 5G wireless systems

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Author: Sethi, Alok1; Aikio, Janne P.2; Shaheen, Rana A.1;
Organizations: 1Center for Wireless Communication - Radio Technologies, University of Oulu
2Circuit and Systems Research Unit, University of Oulu
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Springer Nature, 2018
Publish Date: 2019-06-25


This paper presents a four channel phased array transmitter at 15 GHz aimed for the upcoming 5G wireless systems. The circuit is designed and fabricated using 45 nm CMOS silicon on insulator technology. The design is programmable with exhaustive digital controls available for parameters such as bias voltage, resonance frequency, and gain. The phase shift required for the phased array is provided at RF using an IQ vector modulator (IQVM) topology, which provides both amplitude and phase control. Based on the measurement results, the IQVM provides 360° of phase shift and 15 dB of gain variation. Both phase and amplitude information are encoded in a 10 bit control word. The mean angular separation provided by the IQVM is 3° at optimum amplitude levels. Active area occupied is 2.88 square millimeter. Total DC power consumed by one transmit channel from 1 and 2.6 V supply is 268 mW. The maximum RF output power from one transmit channel is 1dBm. Measured EVM for a 256 QAM modulated signal is as low as 2.0%. All results include the impact of printed circuit board traces and pad parasitics. Based on the achieved results, the proposed architecture is well suited for the next generation of the wireless systems.

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Series: Analog integrated circuits and signal processing
ISSN: 0925-1030
ISSN-E: 1573-1979
ISSN-L: 0925-1030
Volume: 98
Issue: 3
Pages: 419 - 428
DOI: 10.1007/s10470-018-1244-z
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been financially supported by Nokia Corporation Ltd. and Academy of Finland 6Genesis Flagship (Grant 318927).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
Copyright information: © Springer Science+Business Media, LLC, part of Springer Nature 2018. This is a post-peer-review, pre-copyedit version of an article published in Analog Integrated Circuits and Signal Processing. The final authenticated version is available online at: