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A robust inverter‐based amplifier versus PVT for discrete‐time integrators
Author(s) -
Baltolu Anthony,
Albinet Xavier,
Chalet Frederic,
Dallet Dominique,
Begueret JeanBaptiste
Publication year - 2018
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.2517
Subject(s) - slew rate , operational transconductance amplifier , biasing , inverter , amplifier , transconductance , current feedback operational amplifier , operational amplifier , electronic engineering , capacitor , electrical engineering , voltage , computer science , transistor , engineering , cmos
Summary With the reduction of the supply voltage in modern complementary metal‐oxide‐semiconductor technologies, and by their intrinsic class AB behavior, inverter‐based amplifiers are suitable to replace classical operational transconductance amplifiers in switched capacitor circuits like sigma‐delta modulators. This paper presents a new inverter‐based amplifier which increases the reliability versus process, voltage, and temperature variations. A new biasing stage is proposed, which controls the bias current without losing the class AB behavior thanks to the use of biasing transistors operated in linear region and a slew rate enhancement circuit. This makes this amplifier more robust than simple inverters regarding to process, voltage, and temperature variations, reducing the worst‐case bias current spread from +140% to +20%, while costing only 15% consumption increase and keeping inverter dynamic strengths.