Double Quadrature Mixer for Adaptive System-Level Spur Cancellation in UWB Radios

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  • Direct Digital Synthesizers (DDS) are known to be very spurious due to the use of Digital-to-Analog Convertors (DAC). This thesis presents the phase behaviour of spurs of the commercial AD9912 DDS and its SpurKiller cancellation system. A great variation in spur phase and a large variation in its Spurious-Free Dynamic Range (SFDR) was observed. As a result, an adaptive system is proposed using a Double Quadrature Mixer and a variable phase Local Oscillator (LO). The system is tested at an Intermediate Frequency (IF) of 1.2 GHz, simulating the input of an Ultra-Wideband (UWB) radio. In simulation, an increase in SFDR of 29 dB resulted. In system prototype, an increase in SFDR of 10 dB was achieved. The spur-carrier phase offset was found to be unrelated to the phase of the Double Quad LO to achieve maximum spur reduction, and to be with great variation.

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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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