Delta-Sigma Modulation for Direct Digital Frequency Synthesis

Author

Yang, Dayu ; Dai, Fa Foster ; Ni, Weining ; Yin, Shi ; Jaeger, Richard C.

Author_Institution

Dept. of Electr. & Comput. Eng., Auburn Univ., Auburn, AL

Volume

17

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

793

Lastpage

802

Abstract

This paper compares different DeltaSigma modulation techniques for direct digital frequency synthesis (DDS). DeltaSigma modulators such as MASH, feedforward, feedback, and error feedback have been implemented in both the phase and frequency domains in a CMOS DDS prototype IC fabricated in a 0.35-mum CMOS technology with core area of 1.7times2.1 mm² and total current consumption of 75 mA. Measured DDS performance demonstrates that the frequency domain DeltaSigma modulation technique achieves better output spectrum purity than the phase domain method. Moreover, a programmable feedforward DeltaSigma modulator is proposed to achieve different in-band and out-band noise shaping effects for DDS applications.

Keywords

CMOS integrated circuits; delta-sigma modulation; direct digital synthesis; frequency-domain analysis; programmable circuits; CMOS technology; current 75 mA; delta-sigma modulation; direct digital frequency synthesis; domain DeltaSigma modulation technique; error feedback; out-band noise shaping effects; output spectrum purity; phase domain method; programmable feedforward modulator; size 0.35 mum; total current consumption; $DeltaSigma$ modulation; CMOS; digital frequency synthesis (DDS); frequency synthesis; noise shaping; signal to noise and distortion ratio (SINAD); spurious free dynamic range (SFDR);

fLanguage

English

Journal_Title

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on

Publisher

ieee

ISSN

1063-8210

Type

jour

DOI

10.1109/TVLSI.2008.2008458

Filename

4895685