Title :
Tunable continuous-time bandpass ΣΔ modulators with fractional delays
Author :
Sobot, Robert ; Stapleton, Shawn ; Syrzycki, Marek
Author_Institution :
Simon Fraser Univ., Burnaby, BC, Canada
Abstract :
An analytical design methodology for continuous-time (CT) bandpass (BP) ΣΔ modulators is presented. Second- and fourth-order tunable continuous time BP ΣΔ modulator design equations are presented. A novel ΣΔ loop architecture, where the traditional CT BP loop filter function is replaced with the filter function with fractional delays, is proposed. Validity of the methodology is confirmed by mixed-signal behavioral simulations.
Keywords :
band-pass filters; circuit tuning; continuous time filters; delays; sigma-delta modulation; bandpass filters; bandpass sigma-delta modulators; circuit tuning; continuous-time filters; fractional delays; loop filter function; mixed-signal behavioral simulations; sigma-delta loop architecture; tunable continuous-time sigma-delta modulators; Analytical models; Band pass filters; Delay; Design methodology; Filtering theory; Frequency; Pulse modulation; Sampling methods; Transfer functions; Tunable circuits and devices; Bandpass (BP) filters; circuit theory; circuit tuning; continuous-time (CT) filters; delta-sigma modulation;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2005.857085
