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A mm-Wave MIMO transmitter with a digital beam steering capability using CMOS all-digital phase-locked loop chips
, Article 2018 IEEE MTT-S International Microwave Workshop Series on 5G Hardware and System Technologies, IMWS-5G 2018, 30 August 2018 through 31 August 2018 ; 2018 ; 9781538611975 (ISBN) ; Bogdan Staszewski, R ; Farzaneh, F ; Sharif University of Technology
Abstract
In this paper, we propose a mm-wave transmitter architecture intended for radar and 5G MIMO applications with beam steering over 57-63 GHz frequency band. Each transmitter chain comprises an all-digital phase-locked loop (ADPLL) CMOS IC chip intended to be dictated to a single antenna unit within an array. For demonstration purposes, each IC is embedded on a printed circuit board (PCB) to provide beam steering using highly accurate digital approach. The overall transmitter is connected to an antenna array with half wavelength spaced elements to maximize the beam scanning coverage. The ADPLL boards are fabricated and a calibration technique is carried out to align amplitude-phase of all...
Synchronization-Phase Alignment of All-Digital Phase-Locked Loop Chips for a 60-GHz MIMO Transmitter and Evaluation of Phase Noise Effects
, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 67, Issue 7 , 2019 , Pages 3187-3199 ; 00189480 (ISSN) ; Farzaneh, F ; Staszewski, R. B ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
A phase-coherent technique for multiple all-digital phase-locked loops (ADPLLs) is presented and developed in this paper to target a 57-63-GHz multiple-input multiple-output (MIMO) transmitter (TX) with a digital beam-steering capability. The ADPLL TX chains are first fabricated in nanoscale CMOS and then time-synchronized and frequency-phase locked by a field-programmable gate array (FPGA) evaluation board. The calibration approach for phase alignment is carried out using a cancellation method to acquire the out-of-phase state within two ADPLLs. The accuracy of beam steering and phase alignment is investigated and analyzed based on a time-domain model for ADPLL to consider the impact of...