Delta-Sigma Modulation for Direct Digital Frequency Synthesis

Dayu Yang, F.F. Dai, Weining Ni, Shi Yin, R.C. Jaeger
2009 IEEE Transactions on Very Large Scale Integration (vlsi) Systems  
This paper compares different 16 modulation techniques for direct digital frequency synthesis (DDS). 16 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-m CMOS technology with core area of 1 7 2 1 mm 2 and total current consumption of 75 mA. Measured DDS performance demonstrates that the frequency domain 16 modulation technique achieves better output spectrum purity
more » ... n the phase domain method. Moreover, a programmable feedforward 16 modulator is proposed to achieve different in-band and out-band noise shaping effects for DDS applications. Index Terms-CMOS, digital frequency synthesis (DDS), frequency synthesis, noise shaping, signal to noise and distortion ratio (SINAD), spurious free dynamic range (SFDR), 16 modulation.
doi:10.1109/tvlsi.2008.2008458 fatcat:tptp4hlnerepbgd5dqpt6rzwg4