Transconductance with capacitances feedback compensation for multistage amplifiers

Author

Peng, Xiaohong ; Sansen, Willy

Author_Institution

Katholieke Univ. Leuven, Belgium

Volume

40

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

1514

Lastpage

1520

Abstract

A new performance-boosting frequency compensation technique is presented, named Transconductance with Capacitances Feedback Compensation (TCFC). A transconductance stage and two capacitors introduce negative feedback to a three-stage amplifier, which significantly improves the performance such as gain-bandwidth product, slew rate, stability and sensitivity. An optimized TCFC amplifier has been implemented, and fabricated in a 0.35-μm CMOS process. The TCFC amplifier driving a 150-pF load capacitor achieved 2.9-MHz gain-bandwidth product dissipating only 45-μW power with a 1.5 V supply, which shows a significant improvement in MHz·pF/mA performance.

Keywords

CMOS analogue integrated circuits; circuit feedback; integrated circuit design; operational amplifiers; 0.35 micron; 1.5 V; 150 pF; 2.9 MHz; 45 muW; CMOS process; TCFC amplifier; capacitances feedback compensation; multistage amplifiers; transconductance; CMOS process; Capacitors; Frequency; Negative feedback; Parasitic capacitance; Power amplifiers; Power dissipation; Stability; Topology; Transconductance; Amplifier; compensation; low power; multistage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2005.847216

Filename

1458995