A sixth-order 4-2 SMASH CIFF complex bandpass ΔΣ modulator with delaying digital input feedforward

Chien-Hung Kuo, Hung Jing Lai, Deng Yao Shi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, a sixth-order sturdy multi-stage noise shaping (SMASH) bandpass delta-sigma (ΔΣ) modulator [1] with delaying digital input feedforward (DFF) structure [2,3] is presented. The second-order ΔΣ modulator with cascade integrators and distributed feedforward (CIFF) [4] is utilized in each stage to reduce the signal swing. Hence, the requirement of opamp and the power consumption of circuits can be reduced due to the suppression of the signal swing and the discarding of the digital cancellation filters. One pair of complex zeros is designed within signal bandwidth to effectively suppress the noise floor of the presented modulator. The sub-sampling technique is adopted to reduce the clock frequency and the requirement of opamp. Simulation results confirm the feasibility of the proposed SMASH CIFF bandpass ΔΣ modulator with delaying DFF structure. The proposed bandpass ΔΣ modulator compared to the single-loop AFF structure, the signal-to-noise plus distortion ratio (SNDR) could be increased by 12 dB, and the dynamic range (DR) could be extended by roughly 15 dB in a 200 kHz of signal bandwidth centered at 10.7 MHz.

Original languageEnglish
Title of host publicationISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems
Subtitle of host publicationNano-Bio Circuit Fabrics and Systems
Pages305-308
Number of pages4
DOIs
Publication statusPublished - 2010 Aug 31
Event2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems, ISCAS 2010 - Paris, France
Duration: 2010 May 302010 Jun 2

Publication series

NameISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems

Other

Other2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems, ISCAS 2010
CountryFrance
CityParis
Period10/5/3010/6/2

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ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Kuo, C-H., Lai, H. J., & Shi, D. Y. (2010). A sixth-order 4-2 SMASH CIFF complex bandpass ΔΣ modulator with delaying digital input feedforward. In ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems (pp. 305-308). [5537848] (ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems). https://doi.org/10.1109/ISCAS.2010.5537848