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

Yohei MORISHITA; Noriaki SAITO; Koji TAKINAMI; Kiyomichi ARAKI

doi:10.1587/transele.E95.C.999

Special Section on Analog Circuits and Related SoC Integration Technologies

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

Yohei MORISHITA, Noriaki SAITO, Koji TAKINAMI, Kiyomichi ARAKI

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Keywords: 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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2012 Volume E95.C Issue 6 Pages 999-1007

DOI https://doi.org/10.1587/transele.E95.C.999

J-STAGE : transele E97.C 2 pp.130_e1-130_e1

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Abstract

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 65nm 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.

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