A third-order current-mode continuous-time ΣΔ modulator

Author

Aboushady, H. ; Dessouky, M. ; Mendes, E. de Lira ; Loumeau, P.

Author_Institution

Lab. LIP6, Paris VI Univ., France

Volume

3

fYear

1999

fDate

1999

Firstpage

1697

Abstract

In this paper, the design procedure for a third-order continuous-time ΣΔ modulator with RZ feedback is described. The circuit is realized using continuous-time current-mode integrators and DACs with switched-current sources. A design method to find the minimum biasing current required to achieve the desired dynamic range is presented. With a sampling frequency of 25.6 MHz, the circuit is expected to achieve 84 dB of dynamic range for a 100 kHz bandwidth input signal. The circuit operates from a power supply of 1.7 V and consumes 7.4 mW in a 0.35 μm CMOS process

Keywords

CMOS integrated circuits; circuit feedback; continuous time systems; current-mode circuits; integrated circuit design; modulators; sigma-delta modulation; 0.35 micron; 1.7 V; 100 kHz; 25.6 MHz; 7.4 mW; CMOS process; DACs; RZ feedback; continuous-time ΣΔ modulator; current-mode integrators; current-mode sigma-delta modulator; design procedure; dynamic range; minimum biasing current; switched-current sources; third-order ΣΔ modulator; CMOS process; Circuit simulation; Delta modulation; Design methodology; Digital-analog conversion; Dynamic range; Feedback; Frequency; Space vector pulse width modulation; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on

Conference_Location

Pafos

Print_ISBN

0-7803-5682-9

Type

conf

DOI

10.1109/ICECS.1999.814502

Filename

814502