Analysis and Design of a Rotary Travelling-Wave Oscillator for Integration in a Microwave Phased-Array Transmitter

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  • The design methodology and phase noise analysis of a multiphase bipolar Ku-band Rotary Travelling-Wave Oscillator (RTWO) is presented. Lack of symmetry in an RTWO can result in oscillation in an unwanted mode rather than travelling-wave mode. In order to determine the oscillation mode and also measure the phase shift, we have proposed a frequency domain phase shift measurement technique, intended for an 18 GHz RTWO, which is presented. Using a 0.25 μm BiCMOS process from NXP Semiconductors, the fabricated RTW-VCO gives access to eight different phases in steps of 45 degrees and achieves a tuning range of 1.2 GHz centred at 17.5 GHz. A beam-forming technique that utilizes the RTWO for LO phase shifting is also presented. In order to configure a two-element-array transmitter to show the functionality of an RTWO for beam-forming, we have designed and characterized a high frequency distribution network, a switching bank, a power amplifier (PA) and also a patch antenna. All of these components, except the antennas, have been integrated on a single, 19 mm2, silicon die along with the RTWO. The measurement of the full system is performed with the aid of two off-chip antennas fabricated on a high frequency printed circuit board. The combined system is fully functional and the measurement results are provided. This research demonstrates the relevance of the RTWO for integration in phased-array transmitter systems.

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  • Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2016


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