Title :
Mono-rate and multi-rate hybrid continuous-time ΣΔ modulators with SC feedback DAC
Author :
Belotti, Oscar ; Bonizzoni, Edoardo ; Maloberti, Franco
Author_Institution :
Dept. of Electron., Univ. of Pavia, Pavia, Italy
fDate :
June 30 2011-July 1 2011
Abstract :
Methods for avoiding the slew-rate limit and the optimal design of hybrid Continuous-Time (CT) ΣΔ modulators with switched-capacitor (SC) DAC are discussed. Limitations on performance due to finite bandwidth and slew-rate of the operational amplifier are analyzed. The use of multi-rate scheme made by a set of time-interleaved SC-DAC moderates the non-linear error caused by the limited slew-rate in mono-rate converter at equal slew-rate. Behavioral level simulations confirm the validity of proposed technique.
Keywords :
delta-sigma modulation; operational amplifiers; sigma-delta modulation; switched capacitor networks; SC feedback DAC; behavioral level simulations; monorate ΣΔ modulators; monorate converter; multirate hybrid continuous-time ΣΔ modulators; nonlinear error; operational amplifier; slew-rate limit; switched-capacitor DAC; time-interleaved SC-DAC; Capacitance; Capacitors; Clocks; Frequency modulation; Jitter; Resistance;
Conference_Titel :
Signals, Circuits and Systems (ISSCS), 2011 10th International Symposium on
Conference_Location :
lasi
Print_ISBN :
978-1-61284-944-7
DOI :
10.1109/ISSCS.2011.5978641
