Reducing harmonic distortion components of a second-order sigma-delta modulator by using a compensated OTA

Author

Garibay-Lúa, Carlos ; Silva-Martinez, José

Author_Institution

Integrated Circuits Design Group, Nat. Inst. of Astrophys. Opt. & Electron., Puebla, Mexico

Volume

1

fYear

1997

fDate

3-6 Aug 1997

Firstpage

308

Abstract

The performances of second-order sigma-delta modulators implemented with typical folded-cascade operational transconductance amplifiers (OTA) and compensated OTAs are compared. The power consumption and silicon area are the same for both structures and the noise is almost at the same level. It is shown by simulations that the harmonic distortion components are reduced, around -7 dB, when the compensated OTA is employed

Keywords

CMOS integrated circuits; compensation; harmonic distortion; mixed analogue-digital integrated circuits; modulators; operational amplifiers; sigma-delta modulation; 0.8 micron; 250 kHz; 32 MHz; Si; Si area; compensated OTA; folded-cascade OTA; harmonic distortion components reduction; operational transconductance amplifiers; power consumption; second-order sigma-delta modulation; Capacitors; Circuits; Delta-sigma modulation; Equations; Frequency; Harmonic distortion; Noise level; Operational amplifiers; Optical amplifiers; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on

Conference_Location

Sacramento, CA

Print_ISBN

0-7803-3694-1

Type

conf

DOI

10.1109/MWSCAS.1997.666095

Filename

666095