Design of a Direct Sampling Mixer with a Complex Coefficient Transfer Function

Yohei MORISHITA  Noriaki SAITO  Koji TAKINAMI  Kiyomichi ARAKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.6   pp.999-1007
Publication Date: 2012/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.999
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
attenuation pole,  Charge Domain Filter (CDF),  complex filter,  Direct Sampling Mixer (DSM),  discrete time systems,  Image Rejection Mixer (IRM),  IIR filters,  reconfigurable architectures,  

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Summary: 
The Direct Sampling Mixer (DSM) with a complex coefficient transfer function is demonstrated. The operation theory and the detail design methodology are discussed for the high order complex DSM, which can achieve large image rejection ratio by introducing the attenuation pole at the image frequency band. The proposed architecture was fabricated in a 65 nm CMOS process. The measured results agree well with the theoretical calculation, which proves the validity of the proposed architecture and the design methodology. By using the proposed design method, it will be possible for circuit designers to design the DSM with large image rejection ratio without repeated lengthy simulations.