Title :
74dB SNDR multi-loop sturdy-MASH delta-sigma modulator using 35dB opamp gain
Author :
Maghari, Nima ; Kwon, Sunwoo ; Moon, Un-Ku
Author_Institution :
Sch. of EECS, Oregon State Univ., Corvallis, OR
Abstract :
In this paper a new multi-loop delta-sigma modulator is presented. This multi-loop modulator is insensitive to low gain opamps while maintaining the stability advantage. As a proof of concept, a prototype was implemented to show the functionality of this structure. Measurement results shows that with open-loop opamp gain of only 35 dB, this prototype achieves over 74 dB SNDR at oversampling ratio of 16. The sampling frequency is 20 MHz and the total power dissipation is 3.2 mW from a 1.2 V power supply.
Keywords :
delta-sigma modulation; modulators; MASH delta-sigma modulator; SNDR; gain 35 dB; multiloop delta-sigma modulator; open-loop opamp gain; power 3.2 mW; voltage 1.2 V; Bandwidth; Circuits; Delta modulation; Filters; Multi-stage noise shaping; Noise shaping; Power dissipation; Prototypes; Stability; Transfer functions;
Conference_Titel :
Custom Integrated Circuits Conference, 2008. CICC 2008. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-2018-6
Electronic_ISBN :
978-1-4244-2019-3
DOI :
10.1109/CICC.2008.4672031
