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Design of a Linear CMOS OTA with Mobility Compensation and Common-Mode Control Schemes  

Kim, Doo-Hwan (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University)
Yang, Sung-Hyun (SIC CD Group, LG Electronics)
Kim, Ki-Sun (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University)
Cho, Kyoung-Rok (Dept. of Computer and Communication Engineering and Research Institute for Computer and Information Communication, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.43, no.12, 2006 , pp. 81-88 More about this Journal
Abstract
This paper describes a new linear operational transconductance amplifier (OTA). To improve the linearity of the OTA, we employ a mobility compensation circuit that combines the transistor paths operating at the triode and subthreshold regions. The common-mode control schemes consist of a common-mode feedback (CMFB) and common-mode feedforward (CMFF). The circuit enhances linearity of the transconductance (Gm) under the wide input voltage swing range. The proposed OTA shows ${\pm}1%$ Gm variation and the total harmonic distortion (THD) of below -73dB under the input voltage swing range of ${\pm}1.1V$. The OTA is implemented using a $0.35{\mu}m$ n-well CMOS process under 3.3V supply.
Keywords
OTA; CMFF; CMFB; mobility compensation;
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