Title :
A Very Low-Power Class AB/AB Op-amp based Sigma-Delta Modulator for Biomedical Applications
Author :
Lopez-Morillo, E. ; Carvajal, R.G. ; ElGimili, H. ; Ramirez-Angulo, Jaime ; Lopez-Martin, Antonio ; Rodriguez-Villegas, E.
Author_Institution :
Escuela Super. de Ing., Univ. of Seville, Sevilla
Abstract :
A sigma-delta (SigmaDelta) modulator with 8 bits of resolution and only 330 nW power consumption for a cardiac pacemaker is presented The overall modulator operates from 2.3 V down to 1.5 V supply using fully-differential class AB/AB amplifiers with transistors biased in weak inversion. The system has been implemented in a standard 0.5-mum CMOS process. Post-layout simulations have been performed showing 57 dB of SNR with an oversampling ratio of 32.
Keywords :
CMOS analogue integrated circuits; biomedical electronics; cardiology; integrated circuit layout; low-power electronics; operational amplifiers; pacemakers; sigma-delta modulation; SNR; biased transistor; biomedical applications; cardiac pacemaker; oversampling ratio; post-layout simulations; power 330 nW; power consumption; sigma-delta modulator; size 0.5 mum; standard CMOS process; very low-power class AB/AB op-amp; weak inversion region; Bandwidth; Circuit simulation; Delta-sigma modulation; Dynamic range; Energy consumption; Frequency; Operational amplifiers; Pacemakers; Power dissipation; Strontium;
Conference_Titel :
Circuits and Systems, 2006. MWSCAS '06. 49th IEEE International Midwest Symposium on
Conference_Location :
San Juan
Print_ISBN :
1-4244-0172-0
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2006.382311
