A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used to implement the regulated cascode transistors in order to boost the output impedance of the composite input stage and the open-loop gain of the op-amp. Both input and output stages operate in class AB mode. The proposed op-amp has been simulated in a 130nm commercial CMOS process technology. It operates from a 1.2V supply and has a close to rail-to-rail differential output swing. It has 156dB DC open-loop gain and 63MHz gain-bandwidth product with a 30pF capacitive load. The op-amp has a DC open-loop gain figure of merit FOM-{AOLDC} of 174 (MV/V) MHz pF/ mu text{W} and large-signal figure of merit FOM-{LS} of 3(V/ mu text{s}) pF/ mu text{W}.
CITATION STYLE
Paul, A., Ramirez-Angulo, J., Sanchez, A. Di., Lopez-Martin, A. J., Carvajal, R. G., & Li, F. X. (2021). Super-Gain-Boosted AB-AB Fully Differential Miller Op-Amp with 156dB Open-Loop Gain and 174MV/V MHZ pF/μW Figure of Merit in 130nm CMOS Technology. IEEE Access, 9, 57603–57617. https://doi.org/10.1109/ACCESS.2021.3072595
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