A Blind Interference Canceling Technique for Two-Stage Harmonic Rejection in Down-mixers


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Moseley, N.A. and Klumperink, E.A.M. and Nauta, B. (2008) A Blind Interference Canceling Technique for Two-Stage Harmonic Rejection in Down-mixers. In: Proceedings of the 19th Annual Workshop on Circuits, 28 Nov 2008, Veldhoven.

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Abstract:This paper presents practical experiments on a
harmonic rejection down-mixer, which offers up to 75 dB of
harmonic rejection, without an RF filter. The down-mixer uses a two-stage approach; the first stage is an analog multi-path/multiphase harmonic rejection mixer followed by a second stage providing additional harmonic rejection based on blind adaptive interference canceling in the discrete-time domain. The aim is to show its functional operation. The canceler cannot cope with DC offsets. The DC offsets are removed by highpass filters. The signal paths used to obtain an estimate of the interference must be designed to provide as much attenuation of the desired signal as possible. Front-end nonlinearities and DC offsets are discussed.
Item Type:Conference or Workshop Item
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/65351
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