DESIGN AND COMPENSATION OF HIGH PERFORMANCE CLASS AB AMPLIFIERS, ACTA UNIVERSITATIS OULUENSIS C Tec h n i c a 3 5 6

Class A and class AB operational amplifiers are an essential part of a mixed- signal chip, where\nthey are used as active filter sub-blocks, compensators, reference current generators and voltage\nbuffers, to name just a few of many applications. For analog circuits such as operational amplifiers\na mixed-signal chip is a very unfriendly operating environment, where the power supply is often\ncorrupted by high current switching circuits. In addition, power supply voltages for analog blocks\nare shrinking, because of the deployment of new battery technologies and fine line length\nintegrated circuit processes, which can reduce the amplifier dynamic range a problem requiring\nsupply insensitive low voltage compatible amplifier topologies and other analog blocks.\nThe aims of this thesis were to further develop the low voltage compatible class AB amplifier\ntopologies published earlier by other authors, to improve their bandwidth efficiency by means of\nre-examining two- and three-stage amplifier compensation techniques and to find solutions for\nenhancing the high frequency power supply noise rejection performance of class A and class AB\namplifiers without degrading their signal path stability.\nThe class AB amplifier cores presented here improve the amplifier’s power supply noise\ninsensitivity at high frequencies and increase bandwidth efficiency when compared to the\ncommonly used two-stage Miller compensated amplifier, enabling the construction of better\nbuffers and more power-efficient and reliable low voltage mixed signal chips.

ISBN-10:
978-951-42-6176-3
Kieli:
eng.
Sivumäärä:
126 s.
Tekijät:
Loikkanen Mikko
Tuotekoodi 013965
20,00 €