High Gain and High CMRR Two-Stage Folded Cascode OTA with Nested Miller Compensation

Abstract

By using Gm-C compensation (GCC) technique, a two-stage recycling folded cascode (FC) operational transconductance ampli ̄er (OTA) is designed. The proposed con ̄guration consists of recycling structure, positive feedback and feed-forward compensation path. In comparison with the typical folded cascode CMOS Miller ampli ̄er, this design has higher DC gain, unitygain frequency (UGF), slew rate and common mode rejection ratio (CMRR). The presented OTA is simulated in 0.18m CMOS technology and the simulation results con ̄rm the theoretical analyses. Finally, the proposed ampli ̄er has a 111 dB open-loop DC gain, 20MHz UGF and 145 dB CMRR@ 1.2V supply voltage while the power consumption is 400 Wwhich makes it suitable for low-voltage applications.

DOI: 10.1142/S0218126615500577

Cite this paper

@article{Akbari2015HighGA, title={High Gain and High CMRR Two-Stage Folded Cascode OTA with Nested Miller Compensation}, author={Meysam Akbari and Omid Hashemipour}, journal={Journal of Circuits, Systems, and Computers}, year={2015}, volume={24} }