A new modeling and optimization of gain-boosted cascode amplifier for high-speed and low-voltage applications

Author

Ahmadi, Mohammad Mahdi

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada

Volume

53

Issue

3

fYear

2006

fDate

3/1/2006 12:00:00 AM

Firstpage

169

Lastpage

173

Abstract

Because of limited output swing, the basic structure of a gain-boosted cascode amplifier (GBCA) cannot be used to design a low-voltage operational amplifier. In this paper, we investigate the design of a high-swing GBCA, and find the optimum bandwidth for the boosting or feedback amplifier. This bandwidth eliminates the slow-settling component in the step response, prevents the gain-boosting loop from being unstable, and results in the shortest settling time. Finally, we present a very high-speed and high-swing amplifier suitable for low-voltage applications.

Keywords

CMOS integrated circuits; analogue circuits; feedback amplifiers; high-speed techniques; low-power electronics; optimisation; step response; CMOS; analog circuits; gain-boosted cascode amplifier; gain-boosting loop; high-speed amplifier; high-speed applications; high-swing amplifier; low-voltage applications; optimum bandwidth; step response; Bandwidth; Boosting; Charge transfer; Design methodology; Feedback amplifiers; Frequency response; Operational amplifiers; Switched capacitor circuits; Transfer functions; Voltage; Analog circuits; CMOS; cascode amplifier; gain boosting;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2005.858493

Filename

1605427