Beloso Legarra, JavierCruz Blas, Carlos Aristóteles de laLópez Martín, Antonio2023-06-282023-06-282023Beloso-Legarra, J., De La Cruz-Blas, C. A., & Lopez-Martin, A. J. (2023). Power-efficient single-stage class-ab ota based on non-linear nested current mirrors. IEEE Transactions on Circuits and Systems I: Regular Papers, 70(4), 1566-1579. https://doi.org/10.1109/TCSI.2023.32397571549-832810.1109/TCSI.2023.3239757https://academica-e.unavarra.es/handle/2454/45641A novel approach to design low-power area-efficient rail-to-rail output single-stage class-AB operational transconductance amplifiers (OTAs) with enhanced large- and small-signal performance to drive large capacitive loads is presented. It is based on a non-linear nested current mirror at the active load of a splitted differential input pair biased in weak inversion that boosts dynamic currents beyond their quiescent value directly at the output branch. As a result, slew rate, DC gain, gainbandwidth product, settling time and noise performance are improved without additional circuit elements or power consumption. An OTA prototype has been fabricated in a 180-nm CMOS process, consuming a quiescent power of 2.9 µW from a supply voltage of ±0.5 V and a silicon area of 0.001 mm2 . Measurement results validate the advantages of the proposal, exhibiting positive and negative slew rates of 110 V/ms and −58 V/ms, respectively, and a gain-bandwidth product of 136 kHz with a phase margin of 90◦ for a capacitive load of 160 pF.application/pdfeng© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other work.Area efficiencyClass-ABNon-linear nested current mirrorRail-to-rail outputSingle-stage amplifierinfo:eu-repo/semantics/article2023-06-28info:eu-repo/semantics/openAccess