An enhanced fully differential Recyclic Folded Cascode OTA

Author

Patra, Pravanjan ; Kumaravel, S. ; Venkatramani, B.

Author_Institution

ECE, Tiruchirappalli, India

fYear

2012

fDate

20-23 March 2012

Firstpage

1

Lastpage

5

Abstract

In the literature, Recyclic Folded Cascode (RFC) and Improved RFC (IRFC) Operational Transconductance Amplifiers (OTAs) are proposed for enhancing the DC gain and the Unity Gain Bandwidth (UGB) of the Folded Cascode (FC) OTA In this paper, an enhanced RFC (ERFC) OTA which uses positive feedback at the cascode node is proposed for increasing the DC gain without changing the unity gain bandwidth (UGB). This also has an additional advantage of decreasing the Common-Mode (CM) gain of the OTA. For the purpose of comparison, RFC, JRFC and ERFC OTAs are implemented using UMC90nm technology and studied through simulation. From the simulation, it is found that the DC gain of ERFC OTA is higher by 6dB, 1dB compared to that of RFC and IRFC OTAs respectively. The CM gain of ERFC OTA is lower by 31dB, 34dB compared to that of RFC and IRFC OTAs respectively for the same power and area. The Slew rate of ERFC OTA is higher by a factor of 1.14, 1.08 compared to RFC and IRFC OTAs.

Keywords

operational amplifiers; CM gain; DC gain; ERFC OTA; IRFC OTA; UGB; UMC technology; common-mode gain; enhanced fully differential recyclic folded cascode OTA; enhanced recyclic folded cascode operational transconductance amplifiers; improved recyclic folded cascode operational transconductance amplifiers; size 90 nm; slew rate; unity gain bandwidth; Capacitance; Impedance; Inverters; Logic gates; Mirrors; Transconductance; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Systems, Signals and Devices (SSD), 2012 9th International Multi-Conference on

Conference_Location

Chemnitz

Print_ISBN

978-1-4673-1590-6

Electronic_ISBN

978-1-4673-1589-0

Type

conf

DOI

10.1109/SSD.2012.6197977

Filename

6197977