A METHOD TO IMPROVE CMRR FOR CMOS OPERATIONAL-AMPLIFIER BY USING FEEDFORWARD TECHNIQUE

Authors
IBARAGI E HYOGO A SEKINE K
Citation
E. Ibaragi et al., A METHOD TO IMPROVE CMRR FOR CMOS OPERATIONAL-AMPLIFIER BY USING FEEDFORWARD TECHNIQUE, IEICE transactions on fundamentals of electronics, communications and computer science, E80A(2), 1997, pp. 356-359
Citations number
5
Categorie Soggetti
Engineering, Eletrical & Electronic","Computer Science Hardware & Architecture","Computer Science Information Systems
Journal title
IEICE transactions on fundamentals of electronics, communications and computer science → ACNP
ISSN journal
09168508
Volume
E80A
Issue
2
Year of publication
1997
Pages
356 - 359
Database
ISI
SICI code
0916-8508(1997)E80A:2<356:AMTICF>2.0.ZU;2-T
Abstract
In this paper, two types of improved CMRR CMOS OAs N type and P type, without common-mode feedback and the cascode current mirros are propos ed. The CMRR of proposed OAs are enhanced by compensating variations i n tail bias current, caused by a common mode input signal, at the diff erential input stage, by means of feedforward controlled current sourc e. Simulation results show that the CMRR of the proposed OAs are 20dB higher than that of conventional OAs.