Tunable continuous-time bandpass ΣΔ modulators with fractional delays

Author

Sobot, Robert ; Stapleton, Shawn ; Syrzycki, Marek

Author_Institution

Simon Fraser Univ., Burnaby, BC, Canada

Volume

53

Issue

2

fYear

2006

Firstpage

264

Lastpage

273

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;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2005.857085

Filename

1593933