Title :
A 3-V 12-bit second order sigma-delta modulator design in 0.8-μm CMOS
Author :
De Mori, Carlos Renato T ; Crepaldi, Paulo César ; Pimenta, Tales Cleber
Author_Institution :
Grupo de Microeletronica, Escola Fed. de Engenharia de Itajuba, Brazil
Abstract :
This paper examines the design and simulation of a 12-bit sigma-delta modulator that operates from a single 3-V power supply. The proposed modulator has been designed with fully-differential switched-capacitor integrators implemented with folded-cascode operational amplifiers. The main feature of the designed modulator is its simplicity. It shows that it is possible to design a precise modulator of moderate Signal-to-Noise Ratio (SNR) using simple circuits, which do not require precise component matching and high precision components or trimming. The modulator achieves a SNR higher than 74 dB for all the simulated cases with an oversampling ratio of 128 and an oversampling frequency of 2.56 MHz. The modulator was designed in a 0.8-μm CMOS technology and it measures 560 μm × 680 μm
Keywords :
CMOS integrated circuits; integrated circuit design; integrated circuit noise; integrating circuits; modulators; sigma-delta modulation; switched capacitor networks; 0.8 micron; 12 bit; 2.56 MHz; 3 V; 74 dB; CMOS sigma-delta modulator design; SNR; folded-cascode opamps; folded-cascode operational amplifiers; fully-differential SC integrators; oversampling frequency; oversampling ratio; precise modulator; second order sigma-delta modulator; single power supply; switched-capacitor integrators; Bandwidth; CMOS technology; Circuits; Delta-sigma modulation; Digital filters; Digital modulation; Frequency; Signal to noise ratio; Stability; Voltage;
Conference_Titel :
Integrated Circuits and Systems Design, 2001, 14th Symposium on.
Conference_Location :
Pirenopolis
Print_ISBN :
0-7695-1333-6
DOI :
10.1109/SBCCI.2001.953014
