Analytical method to determine optimal out-of-band gain in multi-bit delta-sigma modulator

• Anand Awinash

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Koirala Nischal

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Pokharel Ramesh K.

  EJUST-Center Kyushu University

• Kanaya Haruichi

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Yoshida Keiji

  Graduate School of Information Science and Electrical Engineering, Kyushu University

Abstract

A simple, systematic and deterministic MATLAB simulation which employs Risbo method and analytical simulation is proposed to determine the optimal out-of-band gain to achieve a maximal SNR and the maximum stable amplitude in a multi-bit delta-sigma modulator. Using the proposed method, a 128MS/s, 2MHz signal bandwidth 4^th order 2-bit continuous-time delta-sigma modulator is designed and implemented in 0.18µm CMOS technology to verify the concept. As a result, the modulator achieves a peak SNDR of 79.3dB and a dynamic range of 83dB for a 2MHz signal bandwidth (OSR = 32) while consuming only 7.8mW from 1.8V supply.

Journal

• IEICE Electronics Express

  IEICE Electronics Express 9 (20), 1598-1603, 2012

  The Institute of Electronics, Information and Communication Engineers

Keywords

• analog-to-digital conversion
• continuous-time delta-sigma modulator
• feedforward
• excess loop delay

Details

• CRID: 1390001205213334656
• NII Article ID: 130001922153
• DOI: 10.1587/elex.9.1598
• ISSN: 13492543
• Web Site: https://www.jstage.jst.go.jp/article/elex/9/20/9_1598/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed