Double Quadrature Mixer for adaptive spur cancellation in ultra-wideband radios

Author

Mack, Simon ; Wight, Jim

Author_Institution

D-TA Syst., Ottawa, ON, Canada

fYear

2015

fDate

25-28 Jan. 2015

Firstpage

78

Lastpage

81

Abstract

Direct Digital Synthesizers (DDS) are known to be very spurious due to the use of Digital-to-Analog Convertors (DAC). This paper presents the phase behaviour of spurs of the AD9912 DDS and its SpurKiller cancellation system. A great variation in spur phase and a variation in increased spurious-free dynamic range (SFDR) was observed. As a result, an adaptive system is proposed using a Double Quadrature Mixer and a variable phase LO. The system is tested at the Intermediate Frequency (IF) of 1.2 GHz, simulating 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 resulted.

Keywords

digital-analogue conversion; ultra wideband communication; AD9912 DDS; DAC; DDS; IF; SFDR; SpurKiller cancellation system; adaptive spur cancellation; digital-to-analog convertors; direct digital synthesizers; double quadrature mixer; intermediate frequency; phase behaviour; spurious free dynamic range; ultra wideband radios; variable phase LO; Adaptive systems; Harmonic analysis; Interference; Mixers; OFDM; Power harmonic filters; Synthesizers; Signal synthesis; cancellation; interference; mixers; phase modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium (RWS), 2015 IEEE

Conference_Location

San Diego, CA

Type

conf

DOI

10.1109/RWS.2015.7129780

Filename

7129780