Paper Info
Title
A Replica-Amp Gain Enhancement Technique For An Operational Amplifier With Low Mismatch Sensitivity And High Voltage Swing
Abstract
A new gain enhancement technique for an operational amplifier (opamp) using a replica amplifier is presented to reduce a sensitivity of a gain mismatch between the main amplifier and the replica amplifier which limits a gain-enhancement factor in the conventional replica-amp techniques. In the proposed technique, the replica amplifier is used to only amplify an error voltage of the main amplifier. The outputs of the main amplifier and the replica amplifier are added to cancel the error voltage of the main amplifier. The proposed technique can also achieve a higher output voltage swing because the replica amplifier amplifies only the error voltage. In case of using a fully-differential common-source opamp for the main amplifier and a telescopic opamp for the replica amplifier, Monte Carlo simulation at 100 iterations shows that the proposed amplifier has almost the same gain variation with 15.5 dB gain enhancement and about five times output voltage swing expanding for a supply voltage of 1.2V compared with the single closed-loop amplifier using the telescopic opamp.
Year
DOI
Venue
2016
10.1587/transfun.E99.A.547
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
Keywords
Field
DocType
opamp, gain enhancement, replica amplifier
Fully differential amplifier,Input offset voltage,Open-loop gain,Control theory,Direct-coupled amplifier,Operational transconductance amplifier,Theoretical computer science,Transimpedance amplifier,Op amp integrator,Optoelectronics,Operational amplifier,Mathematics
Journal
Volume
Issue
ISSN
E99A
2
0916-8508
Citations 
PageRank 
References 
0
0.34
4
Authors
5
Name
Order
Citations
PageRank
Junya Matsuno172.51
Masanori Furuta2174.42
Tetsuro Itakura318733.44
Tatsuji Matsuura443.83
Akira Hyogo565.69