An all-digital ΔΣ envelope modulator for EER-based transmitters based on CMOS standard cell design

Chien-Hung Kuo, Shu Li Liao

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

Abstract

This paper presents an all-digital 4-bit delta-sigma (ΔΣ) modulator for envelope elimination and restoration (EER)-based polar transmitters. A fast feedback approach is devised by combining the digital truncator with path gains to reduce the propagation delay of feedback loops in modulators. The CMOS standard cell-based design could hence be utilized to implement the proposed modulator at a sampling frequency of 182 MHz. The noise transfer function of the presented ΔΣ modulator has been optimized to obtain a maximally flat noise band to easily meet the EDGE spectrum mask. Experiment results show the presented ΔΣ modulator has the noise power beneath -60 dB below the full-scale EDGE signal within ±20 MHz of the carrier frequency. The measured adjacent channel power ratios and alternate channel power ratio of the proposed modulator also give a 6 dB margin to the EDGE specification at 400 kHz and 600 kHz offsets.

Original languageEnglish
Title of host publication2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011
Pages325-328
Number of pages4
DOIs
Publication statusPublished - 2011 Sep 13
Event2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011 - Bordeaux, France
Duration: 2011 Jun 262011 Jun 29

Publication series

Name2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011

Other

Other2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011
CountryFrance
CityBordeaux
Period11/6/2611/6/29

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ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Kuo, C-H., & Liao, S. L. (2011). An all-digital ΔΣ envelope modulator for EER-based transmitters based on CMOS standard cell design. In 2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011 (pp. 325-328). [5981321] (2011 IEEE 9th International New Circuits and Systems Conference, NEWCAS 2011). https://doi.org/10.1109/NEWCAS.2011.5981321