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A novel architecture for improving slew rate in FinFET-based op-amps and OTAs

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Title A novel architecture for improving slew rate in FinFET-based op-amps and OTAs
 
Creator THAKKER, RA
SRIVASTAVA, M
TAILOR, KH
BAGHINI, MS
SHARMA, DK
RAO, VR
PATIL, MB
 
Subject OPERATIONAL-AMPLIFIER
High slew rate op-amp
Look-up table
FinFET
Hierarchical particle swarm optimization
Circuit design
 
Description A new architecture for improvement of slew rate (SR) of an op-amp or an operational transconductance amplifier (OTA) in FinFET technology is proposed. The principle of operation of the proposed architecture is based on a set of additional current sources which are switched on, only when OTA should provide a high current, usually for charge or discharge of large load capacitor. Therefore, the power overhead is less compared to conventional high SR designs. The commonly used two-stage Miller-compensated op-amp, designed and optimized in sub 45 nm FinFET technology with 1 V single supply voltage, is used as an example for demonstration of the proposed method. For the same FinFET technology and with optimal design, it is shown that the slew rate of the op-amp is significantly improved. The slew rate is improved from 273 to 5590 V/mu s for an input signal with a rise time of 100 ps. The other performance measures such as gain and phase margin remain unchanged with the additional circuitry used for slew rate enhancement. (C) 2011 Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2012-06-26T07:39:09Z
2012-06-26T07:39:09Z
2011
 
Type Article
 
Identifier MICROELECTRONICS JOURNAL,42(5)758-765
0026-2692
http://dx.doi.org/10.1016/j.mejo.2011.01.010
http://dspace.library.iitb.ac.in/jspui/handle/100/14157
 
Language English