A simple slew rate enhancement technique with improved linearity and preserved small signal performance

Author

Bin Huang ; Degang Chen

Author_Institution

Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA

fYear

2014

fDate

3-6 Aug. 2014

Firstpage

270

Lastpage

273

Abstract

A simple yet very effective slew rate enhancement (SRE) method is proposed. The proposed SRE feedback is off for small signal operation to preserve an amplifier´s small signal performance, and is activated to enhance slew rate (SR) and linearity only when an amplifier is slewing. Compared with a conventional OTA, the OTA with the proposed SRE scheme shows SRE by a factor of 23.2, THD improvement of 6dB and preserved small signal performance with only 1.2% area and 2% power consumption overhead. Compared with the adaptive biasing method, the proposed scheme shows 300% SR improvement, 18dB THD improvement but with power and area consumption decreased by 11.1% and 25% respectively.

Keywords

circuit feedback; harmonic distortion; operational amplifiers; OTA; SRE feedback; THD; adaptive biasing method; amplifier small signal performance; area consumption; improved linearity; power consumption overhead; preserved small signal performance; simple slew rate enhancement technique; small signal operation; CMOS integrated circuits; Equations; Linearity; Mathematical model; Operational amplifiers; Solid state circuits; Transient analysis; slew rate enhancement;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (MWSCAS), 2014 IEEE 57th International Midwest Symposium on

Conference_Location

College Station, TX

ISSN

1548-3746

Print_ISBN

978-1-4799-4134-6

Type

conf

DOI

10.1109/MWSCAS.2014.6908404

Filename

6908404