A Low-Distortion Fourth-Order Bandpass Sigma-Delta Modulator Using Double-Sampling Technique

Hong Lin Xu; Jia Jun Zhou; Jian Yang; Song Chen; Zhi Qiang Gao; Xiao Wei Liu

doi:10.4028/www.scientific.net/KEM.562-565.1058

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 562-565A Low-Distortion Fourth-Order Bandpass Sigma-Delta...

A Low-Distortion Fourth-Order Bandpass Sigma-Delta Modulator Using Double-Sampling Technique

Abstract:

In this paper, a low-distortion fourth-order bandpass sigma-delta (ΣΔ) modulator is proposed based on a switched-capacitor resonator which employs double-sampling technique to relax the requirements for circuits and reduce opamp power consumption and chip area. The modulator is based on the low-distortion low pass ΣΔ modulator. The system level simulation results compare between the low-distortion architecture and the traditional one is given. The full differential circuit applying two-path technique is implemented with TSMC0.18µm CMOS process. It achieves a peak SNR (signal-to-noise ratio) of 85.9dB and DR (dynamic range) of 91dB with 200 kHz bandwidth centered at 20MHz which are better than the conventional bandpass ΣΔ modulator.

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Periodical:

Key Engineering Materials (Volumes 562-565)

Pages:

1058-1062

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.562-565.1058

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Online since:

July 2013

Authors:

Hong Lin Xu, Jia Jun Zhou, Jian Yang, Song Chen, Zhi Qiang Gao, Xiao Wei Liu

Keywords:

Band-Pass, Double-Sampling, Modulator, Sigma-Delta

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References

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