School of Geophysics and Information Technology, China University of Geosciences (Beijing)
Qisheng Zhang
School of Geophysics and Information Technology, China University of Geosciences (Beijing) Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education
Xiao Zhao
School of Geophysics and Information Technology, China University of Geosciences (Beijing)
A proposed transconductance enhancement technique for bulk-driven OTAs working in weak inversion is presented in this paper.The basic idea is to use a bulk-driven input differential pair employing the auxiliary amplifier and positive feedback technique to enhance transconductance,which improves the enhancement ratio of transconductance from (n+1)/(n−1) to (n+2)/(n−1). The proposed amplifier based on the mentioned technique is simulated on UMC 180nm process with the help of Spectre. The simulation results demonstrate that the transconductance of the bulk-driven OTAs working in weak inversion improves almost 50% with just a little increased power consumption compared to the conventional counterparts.
