Title :
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
fDate :
6/1/2009 12:00:00 AM
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);
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
DOI :
10.1109/TVLSI.2008.2008458
