Title :
Effect of op-amp phase margin on SC ΣΔ modulator performances
Author :
Pugliese, A. ; Amoroso, F.A. ; Cappuccino, G. ; Cocorullo, G.
Author_Institution :
Dept. of Electron., Comput. Sci. & Syst., Univ. of Calabria, Rende, Italy
Abstract :
The effect of operational amplifier (op-amp) phase margin on the performances of switched-capacitor (SC) sigma-delta modulators (SigmaDeltaMs) is analyzed. The investigation is carried out by performing behavioral simulations based on a second-order settling description for the SC integrator implemented by the op-amp. The analysis allows well-founded specifications for the amplifier to be defined since the preliminary behavioral simulation phase, avoiding costly system parameters tuning in the transistor-level design phase. Behavioral simulations of a typical single-bit second-order SigmaDeltaM are performed to demonstrate the usefulness of the proposed study in the definition of proper circuit parameters.
Keywords :
operational amplifiers; sigma-delta modulation; switched capacitor networks; SC SigmaDelta modulator performances; op-amp phase margin; sigma-delta modulators; switched-capacitor modulators; transistor-level design phase; Analytical models; Circuit optimization; Circuit simulation; Computational modeling; Computer science; Operational amplifiers; Performance analysis; Phase modulation; Strontium; Time factors;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5118467
