A comparative study of digital ΣΔ modulators for fractional-N synthesis

Author

Shu, Keliu ; Sanchez-Sinencio, Edgar ; Maloberti, Franco ; Eduri, Udaykiran

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

3

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

1391

Abstract

This paper investigates the design of digital ΣΔ modulator (SDM) for fractional-N frequency synthesis. The design considerations are presented. Characteristics of digital ΣΔ modulators compared with their analog counterparts are addressed. Simulation results of 4 types of digital SDMs are presented. The pros and cons of each topology are discussed in detail. Design guidelines of digital SDMs for fractional-N synthesizers are given by this comparative study

Keywords

circuit feedback; circuit simulation; feedforward; frequency synthesizers; network topology; sigma-delta modulation; MASH 1-1-1 architecture; MASH 1-2 architecture; design considerations; digital ΣΔ modulators; fractional-N frequency synthesis; fractional-N synthesizers; multiple feedback; multiple feedforward; simulation results; topology; wireless communications; Delta modulation; Digital modulation; Filters; Frequency conversion; Frequency synthesizers; Guidelines; Phase locked loops; Phase noise; Quantization; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on

Print_ISBN

0-7803-7057-0

Type

conf

DOI

10.1109/ICECS.2001.957474

Filename

957474