Title :
Integrated fourth-order ΣΔ convertor with stable self-tuning continuous-time noise shaper
Author :
Redman-White, W. ; Durham, A.M.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
fDate :
6/1/1994 12:00:00 AM
Abstract :
A fourth-order monolithic ΣΔ convertor is presented. The circuit shows how it is possible to use a completely continuous-time noise shaper with integrated passive components, moving the sampling function to the output of the filter. The associated uncertainty in the fabricated time constants, which is a serious problem in such a high-order design, is made negligible by means of a self tuning circuit. The convertor is unconditionally stable and recovers immediately from gross overload. The chip is fabricated in 1.6 μm CMOS, and operates from a single 5 V supply
Keywords :
CMOS integrated circuits; analogue-digital conversion; delta modulation; stability; tuning; 1.6 micron; 5 V; ADC; CMOS IC; continuous-time noise shaper; fourth-order ΣΔ convertor; high-order design; integrated passive components; monolithic sigma-delta convertor; sampling function; single 5 V supply; stable self-tuning;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings -
DOI :
10.1049/ip-cds:19949568
