doi: 10.7763/IJCTE.2010.V2.187
High linear, High CMRR, Low Power OTA with Class AB Output Stage
Seyed Javad Azhari
,
Farzan Rezaei
- department of Electronics/Electronics Research Center, Iran University of Science and Technology, Tehran, Iran.
Abstract
This paper presents a linear Operational Transconductance Amplifier (OTA) that combines two linearization techniques, one with adaptive biasing of differential pairs and second with using of resistive source degeneration. OTA has ±0.9v power supply and consumes 250μw. Improvement of adaptive bias circuit and using class A Bout put stage and CMFB circuit has enhanced the CMRR to 169dB in DC that reduces to 131dB at 1MHz. OTA has been simulated with TSMC 0.18μm CMOS technology in Hspice. The simulated third order harmonic distortion (HD3) with applying a 600mvP-P differential input is -65dB at 1MHz frequency.
Keywords
- Operational
- Transconductance
- Amplifier(OTA);
- linearity;
- adaptive
- bias
- circuit;
- source
- degeneration;
- CMRR
How to Cite
Seyed Javad Azhari and Farzan Rezaei, "High linear, High CMRR, Low Power OTA with Class AB Output Stage," International Journal of Computer Theory and Engineering, vol. 2, no. 4, pp. 473-477, 2010. https://doi.org/10.7763/IJCTE.2010.V2.187
Copyright & License
Copyright © 2010 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).