Three-Stage CMOS OTA for Large Capacitive Loads With Efficient Frequency Compensation Scheme

Author

Grasso, Alfio Dario ; Palumbo, Gaetano ; Pennisi, Salvatore

Author_Institution

DIEES, University of Catania, Barcelona

Volume

53

Issue

10

fYear

2006

Firstpage

1044

Lastpage

1048

Abstract

A simple compensation strategy, which employs passive components only, is adopted to design a three-stage operational transconductance amplifier (OTA) suitable for driving high capacitive loads. Compared to the classical nested Miller compensation technique, the new solution exploits two additional resistors and allows a reduction in the values of the compensation capacitors of about an order of magnitude. The OTA was fabricated using 0.35-mum CMOS technology and exhibits a 1.4-MHz gain-bandwidth with a load of 500 pF

Keywords

CMOS analogue integrated circuits; compensation; operational amplifiers; 0.35 micron; 1.4 MHz; CMOS technology; compensation capacitors; frequency compensation; nested Miller compensation; operational transconductance amplifier; Bandwidth; CMOS technology; Capacitors; Circuit testing; Frequency; Impedance; Low voltage; Operational amplifiers; Resistors; Transconductance; Frequency compensation; nested Miller; operational transconductance amplifier (OTA);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.882231

Filename

1715574