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Comparative performance analysis and complementary triode based CMFB circuits for fully differential class AB symmetrical OTAs with low power consumption
Author(s) -
Centurelli Francesco,
Monsurrò Pietro,
Trifiletti Alessandro
Publication year - 2016
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2123
Subject(s) - triode , nmos logic , cmos , electronic engineering , pmos logic , power (physics) , current mirror , power consumption , topology (electrical circuits) , engineering , electrical engineering , voltage , transistor , computer science , physics , capacitor , quantum mechanics
Summary In this paper we extend the figures of merit for class AB symmetrical OTAs to the fully differential case and compare topologies from the literature. This analysis shows that the power consumption of the CMFB can have a significant role in determining the efficiency of the OTA, but on the other hand a CMFB is needed both to set the desired output common mode voltage and to improve the CMRR. We propose the complementary triode CMFB, i.e. a triode CMFB applied both at the NMOS and PMOS current mirrors, as suitable for class AB symmetrical OTAs, and show some case studies in deep submicron CMOS technology to assess the effectiveness of the proposed solution. Copyright © 2015 John Wiley & Sons, Ltd.