کنفرانس مهندسی برق ایران

صفحه اصلی / سی و یکمین کنفرانس بین المللی مهندسی برق

A novel CMRR Enhancement technique in fully-differential Class-AB OTAs

نویسندگان :

Amirhossein Sabour¹ Mahsa Ramezan Pour² Mohammad Yavari³

1- دانشگاه صنعتی امیرکبیر 2- دانشگاه صنعتی امیرکبیر 3- دانشگاه صنعتی امیرکبیر

کلمات کلیدی :

Operational Transconductance Amplifier،CMRR Enhancement،SR enhancement،class-AB OTAs

چکیده :

In this paper, a novel method of improving the CMRR and SR of OTAs has been proposed. Our scheme suggests the elimination of the biasing current source of class-A OTAs with the goal of SR enhancement and proposes a novel and intuitive CMRR enhancement technique to counteract the negative effect of the eliminated biasing current source. One major advantage of our proposed scheme is its ability to be easily incorporated into various OTA architectures. Circuit-level simulations have been carried out using 180nm CMOS technology with HSPICE. Our simulation results show that the resulting OTA from our technique exhibits a 2.38-time increase in SR and a 30dB CMRR enhancement compared to the initially considered class-A OTA, while maintaining approximately the same values in other metrics.