Title :
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
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;
Conference_Titel :
Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on
Conference_Location :
Sacramento, CA
Print_ISBN :
0-7803-3694-1
DOI :
10.1109/MWSCAS.1997.666095
