High-Drive and Linear CMOS Class-AB Pseudo-Differential Amplifier

Author

Giustolisi, Gianluca ; Grasso, Alfio Dario ; Pennisi, Salvatore

Author_Institution

Dipt. di Ingegneria Elettrica, Elettronica e dei Sistemi, Catania Univ.

Volume

54

Issue

2

fYear

2007

Firstpage

112

Lastpage

116

Abstract

A CMOS pseudo-differential-input differential-output amplifier operating in class AB and exhibiting high-current-drive capability is presented. The circuit operates from a minimum supply of V_T+2V_DS,SAT, provides fast settling response, and also characterized by a wide input differential range with high linearity that enables its use even as a transconductor for filtering applications. For this purpose, a common-mode feedback section is also included. A circuit prototype was fabricated using a 0.35-mum technology and powered with 2 V. Using a quiescent current of 20 muA, experimental measurements show a differential current-drive capability of 1 mA (which is 50 times greater than the quiescent value), with this value being solely limited by the input voltage swing allowed. Third-order harmonic distortion is lower than -64 dB for a 1-Vpp 100-kHz input

Keywords

CMOS integrated circuits; differential amplifiers; feedback amplifiers; 0.35 micron; 1 mA; 100 kHz; 2 V; 20 muA; CMOS amplifier; class-AB amplifier; common-mode feedback section; high-current-drive capability; high-drive linear amplifier; pseudodifferential amplifier; Circuits; Current measurement; Differential amplifiers; Distortion measurement; Feedback; Filtering; Linearity; Prototypes; Transconductors; Voltage; CMOS; Class AB; differential pair; trans conductor;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2006.886239

Filename

4100861