A 50-MHz multibit sigma-delta modulator for 12-b 2-MHz A/D conversion

Author

Brandt, Brian P. ; Wooley, Bruce A.

Volume

26

Issue

12

fYear

1991

fDate

12/1/1991 12:00:00 AM

Firstpage

1746

Lastpage

1756

Abstract

The authors examine the application of oversampling techniques to analog-to-digital conversion at rates exceeding 1 MHz. A cascaded multibit sigma-delta (ΣΔ) modulator that substantially reduces the oversampling ratio required for 12-b conversion while avoiding stringent component matching requirements is introduced. Issues concerning the design and implementation of the modulator are presented. At a sampling rate of 50 MHz and an oversampling ratio of 24, an implementation of the modulator in a 1-μm CMOS technology achieves a dynamic range of 74 dB at a Nyquist conversion rate of 2.1 MHz. The experimental modulator is a fully differential circuit that operates from a single 5-V power supply and does not require calibration or component trimming

Keywords

CMOS integrated circuits; analogue-digital conversion; modulators; 1 micron; 12 bit conversion; 2 to 2.1 MHz; 5 V; 50 MHz; A/D conversion; ADC; CMOS technology; cascaded modulator; fully differential circuit; multibit sigma-delta modulator; oversampling techniques; single 5-V power supply; Analog-digital conversion; CMOS technology; Calibration; Circuits; Delta-sigma modulation; Dynamic range; Instruments; Noise shaping; Sampling methods; Very large scale integration;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.104165

Filename

104165