Fully Differential Miller Op-Amp with Enhanced Large- and Small-Signal Figures of Merit

A highly power-efficient, fully differential Miller op-amp with accurately controlled output quiescent current is introduced. The op-amp can drive both capacitive and resistive load due to the presence of the auxiliary amplifier. This amplifier helps to achieve class AB operation of the proposed op-...

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Bibliographic Details
Published in:Journal of low power electronics and applications 2022-03, Vol.12 (1), p.9
Main Authors: Paul, Anindita, Ramirez-Angulo, Jaime, Vázquez-Leal, Héctor, Huerta-Chua, Jesús, Diaz-Sanchez, Alejandro
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
analog integrated circuit
class-AB
Current efficiency
Data acquisition systems
Efficiency
Figure of merit
fully differential
Internet of Things
miller effect
Power efficiency
Power supply
Signal processing
slew-rate
Transistors
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Summary:A highly power-efficient, fully differential Miller op-amp with accurately controlled output quiescent current is introduced. The op-amp can drive both capacitive and resistive load due to the presence of the auxiliary amplifier. This amplifier helps to achieve class AB operation of the proposed op-amp. The fully differential auxiliary amplifier is compact and uses a resistive local common-mode feedback network. It consumes only 6% of the total current of the op-amp. The proposed op-amp has several innovative features. Incorporating the auxiliary amplifier helps to improve the unity gain frequency, power efficiency, slew-rate, and common-mode rejection ratio of the proposed op-amp. It can drive a wide range of resistive (200 Ω–1 MΩ) and capacitive loads (5 pF–300 pF). The op-amp has a large signal dynamic current efficiency of 8.6 and a large signal static current efficiency of 7.9. The small-signal figure of merit is 8.7 for RL = 1 MΩ and 7.3 for RL = 200 Ω.
ISSN:2079-9268
2079-9268
DOI:10.3390/jlpea12010009