Publication detail

Implementation of a Multipath Fully Differential OTA in 0.18-mu m CMOS Process

AKBARI, M. MAWLOOD HUSSEIN S. HASHIM Y. KHATEB, F. KULEJ, T. KEA-TIONG, T.

Original Title

Implementation of a Multipath Fully Differential OTA in 0.18-mu m CMOS Process

Type

journal article in Web of Science

Language

English

Original Abstract

This brief implements a highly efficient fully differential transconductance amplifier, based on several input-to-output paths. Some traditional techniques, such as positive feedback, nonlinear tail current sources, and current mirror-based paths, are combined to increase the transconductance, thus leading to larger dc gain and higher gain bandwidth (GBW) product. Two flipped voltage-follower (FVF) cells are employed as variable current sources to provide class-AB operation and adaptive biasing of all other drivers. The proposed structure includes several input-to-output paths that play the role of dynamic current boosters during the slewing phase, thus improving the slew rate (SR) performance. The circuit was fabricated in a TSMC 0.18-mu m CMOS process with a silicon area of 54.5 x 30.1 mu m. Experimental results show a GBW of 173.3 MHz, a dc gain of 72.7 dB, and an SR of 139.4 V/mu s for a capacitive load of 2 x 5 pF. The proposed circuit consumes 619 mu W of power, under a supply voltage of 1.8 V.

Keywords

Amplifier; class-AB; CMOS; fully differential; operational transconductance amplifier (OTA); positive feedback; slew rate (SR); transconductance

Authors

AKBARI, M.; MAWLOOD HUSSEIN S.; HASHIM Y.; KHATEB, F.; KULEJ, T.; KEA-TIONG, T.

Released

9. 1. 2023

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Location

PISCATAWAY

ISBN

1557-9999

Periodical

IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS

Year of study

31

Number

1

State

United States of America

Pages from

147

Pages to

151

Pages count

5

URL

https://ieeexplore.ieee.org/document/9944072

BibTex

@article{BUT180738,
  author="AKBARI, M. and MAWLOOD HUSSEIN S. and HASHIM Y. and KHATEB, F. and KULEJ, T. and KEA-TIONG, T.",
  title="Implementation of a Multipath Fully Differential OTA in 0.18-mu m CMOS Process",
  journal="IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS",
  year="2023",
  volume="31",
  number="1",
  pages="147--151",
  doi="10.1109/TVLSI.2022.3218741",
  issn="1557-9999",
  url="https://ieeexplore.ieee.org/document/9944072"
}